BITAFAL GROUP WEBINAR CYCLE

The first webinar of the High Performance Superficial Treatments Cycle was held.

The first module of this cycle was carried out last Thursday September 24 through the zoom platform with more than 350 subscribers from 26 countries. Relevant topics were discussed to achieve the success of gravel irrigation such as materials, selection of the type of treatment, design and good construction practices.

We are happy to share with all of you this new virtual adventure to exchange knowledge and opinions. The first conference of this first Cycle exceeded our expectations in terms of attendance, adding more than 350 registrations, including technicians, students, officials and builders, demonstrating the growing interest in Latin America for cost-efficient solutions for the road network.

In the presentation by Ing. Ignacio Kröger, some critical points to be taken into account that can improve the quality and favor the success of the application of gravel irrigation were dealt with very concisely. In the area of materials, the importance of granulometry tests, ALD (average minimum size), cleanliness, wear and polishing of aggregates was discussed; and the performance tests of the binders, which are adjusted to the climate and traffic of the project. Some of the tables included in our manual regarding the selection of treatments were also presented and a review of the methodology for using the Australian and New Zealand dosage design was made. Finally, some recommendations were discussed regarding the execution of irrigation, on planning, sweeping, compaction and we showed some examples of proven cases of success in Uruguay.

In module 2, we will focus on the transformation that the evaluation of surface treatments has had (from material control to quality control), marking the difference between traditional tests and new performance tests. We will talk about laboratory and construction tests that allow us to improve the final quality of the treatments and new ways to evaluate their behavior in the long term.

Module 2 will take place on the day October 15th, at 4:00 p.m. (Uruguay GMT -3).

We leave below the invitation to register, we are waiting for you!

ROUTE 104 REHABILITATION

Serviam began the rehabilitation works that will culminate before the tourist season

The route that connects Routes 9 and 10 at Manantiales is being rebuilt along its 15 km length through recycling with Portland cement and a Capeseal as wearing course, similar to what was done on Route 60.

It is an ideal solution due to the aesthetic and functional quality of the combination of treatments for a route that has high light traffic in the summer season.

The works began with a strip cleaning and ditch deepening as well as the surcharge of between 15 and 20 cm of coarse that is being stabilized with cement together with the existing old bituminous treatment.

As in the rehabilitation of Route 18 (Making Paths Newsletter #102), a series of transverse cuts with emulsion is made to control cracking. IRRIGATION BITAFAL 65 with equipment specially designed for it. A radiofrequency motor grader guidance system is also being used that allows a great improvement in the roughness of the section that will later receive a surface treatment.

Irrigation Curing with Emulsion IRRIGATION BITAFAL 65 and grinding sand has excellent adhesion and performs very well as a stabilized base protection.

In the next few days, the Capeseal type paving works will begin with a simple bituminous treatment with emulsion IRRIGATION BITAFLEX 65 P40 and cold microagglomerate with emulsion BITAFLEX MICRO 62 P25.

We will keep you informed of the development of the work in future editions of our newsletter.

BITASEAL: NEW FLOOR REJUVENATOR

Now BItafal has a new product with excellent performance to seal and improve the appearance of pavements

Easy to apply, flexible and totally waterproof the new BITASEAL it is the best way to seal surfaces and improve the appearance of pavements.

It is a solvent resistant product and has selected aggregates that provide excellent slip resistance, making it especially useful in parking lots, race tracks and other surfaces where fuels deteriorate the pavement.

Below we tell you more about the product and the experience carried out at the Rivera Autodrome:

Due to the deterioration of the Rivera track, where there were dislodges of aggregate from the mixture, some cracks and a rather aged surface, the recovery of a part of the track with the new BITASEAL.

The application of the product was carried out by means of a mop in a very simple way, leaving a homogeneous surface, sealed and with a high slip resistance. After 40 minutes of applying it, it already has an opaque surface and almost ready to be released to traffic. In any case, it is recommended to let it dry for 2 to 3 hours for better performance.

The product is presented in 40 kg buckets and yields between 1 and 2 kg / m2 depending on the surface to be treated. We invite you to learn more about the experience and the appearance of the product in the attached photographs.

WITH THE ENTRY OF SPRING, SURFACE TREATMENTS ARE BACK

The closure ends on September 1 and surface treatments begin to be seen again in the works.

The use of emulsions, which in winter involves special care, becomes common from September with various work fronts that will use the technology both on the road and on shoulders. In the following note we reinforce the main concepts to avoid premature defects in surface treatments with emulsions, especially when the first summer heats come.

An adequate application of the surface treatment implies a combination of factors to ensure success, as indicated in the Figure below the book "High Performance Surface Treatments"

https://bitafal.com.uy/libro-tratamientos-superficiales/

From this extensive list, we can highlight some points and make recommendations for a good execution in the months to come.

Weather condition in the application: The days are longer and the temperatures are starting to rise but we may still find ourselves in the months to come with wet and cold weeks. Special attention must be paid to days with maximum temperatures of 10°C and days with high relative humidity and little wind even in mild temperatures. The water of the emulsion must evaporate to achieve the total cohesion of the binder and if not, premature detachment of aggregates will occur, with the risk of having to re-execute and over-dosage. Another problem with cold is the formation of skin in the applied emulsion that retains the emulsion between the treatment and the base. This effect can seriously affect the treatment in the first days of heat, since the vapor pressure of the retained water pierces the membrane and begins to come to the surface, causing punctual exudations that can affect the rest of the treatment. To avoid these problems, see in the Book the "7.4.10 Execution in winter" that are used for those complicated days as well.

Aggregate penetration potential: The driving of the stone in a granular base can seriously affect the necessary voids of the system leading to exudation mainly in the tracks where the tires make an extra compaction effort. It is first necessary to evaluate this effect by means of the Ball Penetration Test (Annex D of the Book) and then take measures such as reprofiling and compacting or stabilizing with cement.

Component dosage: An excess of residual binder in the system is not perceived in the winter but as temperatures increase and its viscosity decreases, the voids are reduced both by expansion of the asphalt and by the accommodation of the aggregate that the binder allows. Here the variables to control are several, such as the theoretical design itself regarding what is found in the field, the calibration and periodic maintenance of the used equipment, the use of binders suitable for traffic and climate. For each of these variables you can find a detail in the Book of good practices.

Execution method: For double irrigations, it is necessary to evaluate if it is possible to do both irrigations on the same day and thus ensure that all the aggregate used is locked prior to the release of traffic. When irrigation A is carried out and much later B, it happens that the initial simple treatment settles down and becomes clogged, reducing its macrotexture as well as losing some aggregate and therefore the potential for exudation increases. When B is executed, the dosage should be adjusted to the new existing macrotexture, which does not happen, ending in exudations. The use of TMT technology allows double irrigations to be carried out on the same day, ensuring the success of the treatment. We have technology transfer licenses that include
know-how and technical assistance through a training course. For more information enter Licenses. https://bitafal.com.uy/licencias/

Used materials: Aggregates of the same size generate interlocked surfaces that better distribute traffic efforts, are more resistant to detachment and have less potential for exudate, for this reason we must adjust the sizes to consecutive sieves. Using 5-14 mm aggregates for example implies that physically first the 5 mm falls and then the 14 mm, leaving the latter not adhered to the surface and changing the aggregate / asphalt balance.

On the other hand, the emulsions must have an adequate residual binder, with sufficient viscoelasticity to prevent bleeding in the summer. In addition, it must be of the appropriate degree of modification for the traffic and climate of each particular work. line emulsions On the other hand, the emulsions must have an adequate residual binder, with sufficient viscoelasticity to prevent bleeding in the summer. In addition, it must be of the appropriate degree of modification for the traffic and climate of each particular work. line emulsions On the other hand, the emulsions must have an adequate residual binder, with sufficient viscoelasticity to prevent bleeding in the summer. In addition, it must be of the appropriate degree of modification for the traffic and climate of each particular work. line emulsions

SEPTEMBER 9 #INTERCILA 2020

There are only a few days left for the #interCILA, a digital event that will have news and surprises, and where we will be inviting you to the next XXI CILA in Punta del Este.

The #interCILA 2020 will be held on 9th September and a new hybrid form of participation will be put to the test, where the digital and virtual worlds will share space for the first time in our sector.

Grupo BITAFAL will be present with a virtual stand that can be visited in addition to having personalized avatars to interact with participants from all over the world in this new modality.

10 months ago we said goodbye to the extraordinary XX CILA congress in Guadalajara. Since that date the world has changed unexpectedly and our lives have changed too. Among so many other learnings, we have had to deal more than ever with technology, learning to work remotely, helping children with their online classes, etc. Adapted to this new normality, and faithful to its style, Itafec challenges us to take another step in the digital world, inviting us to the first virtual conference in our sector.

In this #interCILA 2020, participants will be able to register electronically from the itafec-enabled web platform and will be able to make their own personalized avatar to navigate the congress, talk with colleagues and visit the virtual stands of the sponsors! Itafec will also broadcast the event as it normally does, through streaming.

www.intercila.com

An opportunity to relive the best moments of the last CILA in Mexico and a new opportunity to present what awaits us at the XXI CILA Punta del Este in 2021. We invite you to see the complete program: https://intercila.com/programa/

Don't miss this #interCILA 2020, which will be more innovative than ever!

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BITAFAL GROUP WEBINAR CYCLE

Delving into various topics of interest, we begin with a new challenge to share our knowledge

This coming September we will begin to issue the first cycle of conferences that complement and deepen what has been published in our manual on "High Performance Surface Treatments".

True to our word, we have listened to your comments and concerns that you sent us from the June survey, where we asked the topics that most interest you for a Webinar. 1 out of 5 voted to delve into the topic "Life Cycle Analysis with surface treatments", and for this reason we decided to make a first Cycle called "High Performance Surface Treatments", which encompasses this topic and others that also appear in our manual. . We will have top-level guests, such as Ing. Jorge Prozzi from the University of Texas.

This Cycle consists of three modules:

MODULE 1: How to guarantee the success of gravel irrigation: materials, selection, design and good construction practices.

MODULE 2: Surface treatments: Performance tests.

MODULE 3: Life cycle analysis of surface treatments: the most efficient option for conservation.

Our goal is to extend our knowledge and share the national and international experience of surface treatments, so that they achieve maximum performance. This implies interventions where special care is taken in the evaluation of the existing surface, the materials, the selection of the appropriate treatment, the design and the construction so that our path is SAFE, RELIABLE and SUSTAINABLE.

SAFE: The type of treatment, the resistance to polishing of the aggregate, the appropriate binder, the correct dosage of materials, careful construction, etc. These are aspects that affect the final safety of the road but must be considered individually. The objective is to guarantee traffic and safety conditions, minimizing circumstances that could generate costs for users and accidents.

TRUSTWORTHY: With this approach, surface treatments are first-order interventions that require the same care and detailed study as asphalt mixtures. In these situations, it is expected that the treatments comply with higher stresses and demands and for this it is essential to evaluate the structural and surface conditions through inspections and auscultation, define specific design methods for the provision of aggregates and binder, ensure the calibration of the equipment and document best construction practices. The objective is to provide tools for those responsible to make decisions based on scientific and methodological criteria, which allow predicting what the useful life of the treatment will be and, consequently, it can be a reliable instrument within the conservation strategy.

SUSTAINABLE: It consists of doing more and better, with less. High performance treatments play an essential role in the preventive maintenance of the pavement and are the answer to a technical, economic and environmental analysis. These interventions are optimized for the traffic and climatic conditions that are expected, use materials and processes that generate a smaller environmental footprint and seek to reduce the total cost of the pavement's life cycle. The goal is to put the right treatment on the right track at the right time.

We will be sharing news about the webinars on our networks.

HIGHLY MODIFIED ASPHALTS (HIMA)

31 July 2020
in: Technical articles,Asphalt,HiMA

One of the questions that arises from the use of modified asphalts is to what extent it is possible to increase the level of polymer in the formula or degree of modification, to further increase the advantages that the modified ones present over the conventional ones.

In standard modified asphalts, the increase in the amount of polymer in the solution leads to an increase in the viscosity of the asphalt. The high viscosities make its handling in the industry impractical, since the asphalt must be heated to high temperatures so that it can be pumped and adhered to the stone aggregates when manufacturing asphalt mix. In a context where the price of fossil fuels and environmental responsibility are increasing, this does not seem to be a viable option.

There are SBS polymers with a high vinyl content (1) that have better compatibility with asphalt. This is due to the fact that it is made up of shorter chains compared to those of the SBS polymers present in the standard modified ones, which also translates into a lower viscosity of the solution (1). Short chains also make the reaction rate faster, further increasing compatibility. All this makes it possible to increase the amount of modifying agent in the asphalt binder without the aforementioned problems occurring. Also, the manufacturing methods are essentially the same with some additions that we will see in this section.

Intermolecular structure

Highly modified asphalts have some key differences that set them apart from standard asphalts, such as the aforementioned amount of polymer. Highly Modified Asphalt, HiMA, is made with 7.5% polymer by weight. From this value, a change in the intermolecular structure of the ligand is observed, which is essential to classify it as highly modified. The continuous matrix becomes formed by the SBS chains and the asphalt molecules become the dispersed phase, creating colloidal groups, as shown in Figure 1. This means that the mechanical properties of the binder are largely determined by the polymeric network, being able to show improvements with respect to standard modified asphalts, as shown by various studies (1,2). The continuous matrix change phenomenon is due to the strong interaction of the SBS polymers with the asphalt, which allows them to increase up to ten times their own volume when associated with maltenes.

Figure 1. Scheme of the transformation of the molecular structure of the binders with the increase of a modifying agent. Adapted from Field and Laboratory Study of High-Polymer Mixtures at the NCAT Test Track (2).

Bibliography

Scholten, Erik J., Vonk, Willem y Korenstra, Jan. Towards green pavements with novel class of SBS polymers for enhanced effectiveness in bitumen and pavement performance . Varsovia : 2nd International Conference on Environmentally Friendly Roads, 2009.
Timm, David H., and others. Field and Laboratory Study of High-Polymer Mixtures at the NCAT Test Track. Auburn : National Center for Asphalt Technology, 2012.

BITAFAL PARTICIPATED IN THE ACTION Holidays #Entretodosparatodos

Last weekend, those of us who are part of Grupo BItafal were able to enjoy as a family the on-line theater performances of the "Vacations #entretodosparatodos" project.

This initiative aims to collaborate with five major cases in our country: Peluffo Giguens Foundation, Kangaroo Foundation, Children's Villages, Coranzoncitos Foundation, and Liceo Francisco.

We were able to choose between 5 performances that included “Opa Payasos” “Mago Daniel K” “Tía Libi's show” “Clap Clap Circo” and “Ruperto Rocanrol”.

It was an excellent opportunity to enjoy in this format that this new reality in which we are living offers us, to disseminate wonderful artists from our country, and at the same time collaborate with organizations that have been affected by the situation we are going through.

We thank the entire organization and we hope that initiatives like these will be replicated.

PERIODIC ROAD CONSERVATION TECHNIQUES COURSE

Bitafal was a keynote speaker in the virtual course of the Ministry of Communications and Transportation (SCT) of Mexico and the Mexican Asphalt Association (AMAAC).

Grupo Bitafal held the inaugural conference of the "Refresher Course in Periodic Road Maintenance Techniques", a Mexican event with more than 500 participants. Below we delve into the content of the course and a free tool for the selection of surface treatments.

Organized by the SCT of Mexico and AMAAC, the course on conservation techniques aimed to update the knowledge of Mexican administration professionals. The event took place over three days, each covering a particular theme. The first day the theme was "Periodic Conservation Techniques" and Bitafal gave the first lecture by Ing. Ignacio Kröger, who dealt with the detection of opportunities and limitations in the evaluation of pavements as well as the correct selection of surface treatments. The first day was completed by important exhibitors, such as Eng. Salvador Fernández Ayala, General Director of Highway Conservation of the SCT and Dr. Adriana Vargas, researcher of the North American National Center for Asphalt Technology (NCAT).

The session on the second day dealt with the theme of "Good practices in conservation treatments" with presentations on gravel, microagglomerates, sealing and caulking of cracks. The presentation by Ing. Jorge Alarcón on his experience in the reuse of milled material (RAP), the different recovery techniques and the configurations of asphalt plants for a greater incorporation of RAP was highlighted on that day.

On the third day, “Asphalt mixes as conservation techniques” were studied in depth, commenting on the good practices of milling, patching and discontinuous mixes. Eng. Francisco Ramos commented on the guide on "Road Conservation Procedures and Techniques" developed by the SCT and detailed the highly recommended "Conservation Treatment Selection Tool" available for free at .

We thank the SCT and AMAAC for the invitation and for having the initiative to share crucial issues for the sustainable development of Latin American roads. Follow us on social networks to find out when the videos of the course are published.

Linkedin: https://www.linkedin.com/company/grupo-bitafal/
Twitter: https://twitter.com/BITAFAL

USE OF THE RHEOMETER TO EVALUATE FOOTPRINT AND FISSURES

30 June 2020
in: Technical articles,Asphalt,Citevi,Asphalt mixtures,Reometro

We reviewed some agile tests to estimate performance of asphalt mixes with the DSR.

New paving technologies require modern equipment to evaluate the behavior of asphalt. The Dynamic Cut Rheometer (DSR) has positioned itself as the international reference equipment for measuring the viscoelastic properties of asphalt. In addition to amazing measurement accuracy, one of its biggest advantages is optimizing time in the laboratory.

We invite you to read the note where we summarize some of the results of the research presented at the XX CILA where we study the behavior of asphalt against rutting and cracking through agile tests in the DSR.

Article "AGILE TRIALS IN DSR TO ESTIMATE PERFORMANCE OF ASPHALT MIXTURES"

In 2018, one of the country's first dynamic cutting rheometers (DSR) was acquired to study the rheological behavior of asphalt. https://bitafal.com.uy/novedades/bitafal-entra-al-mundo-de-la-reologia/.

Using transient (creep, stress / strain at constant rate) and dynamic (oscillatory) methods, the team determines the viscoelastic properties of asphalts in very short times.

Globally, road researchers have made numerous efforts to correlate the behavior of the asphalt binder in the laboratory with its performance in the field, mainly to identify the causes of the most common pavement failures, such as fatigue cracking and rutting.

In recent years, the test called Multiple Stress Creep and Recovery (MSCR) has become popular, which allows evaluating the behavior of the binder against rutting. The test is carried out in a few minutes and its result, through the non-recoverable "creep compliance" parameter (Jnr), can be correlated with its resistance to permanent deformation in a rolling test. As a general rule, the lower Jnr, the better its behavior against rutting.

On the other hand, to address the problem of fatigue cracking, a variation to the LAS (Linear Amplitude Sweep) test has very recently been proposed to determine fatigue laws of binders in reduced times, which could be correlated with prolonged fatigue tests at asphalt mixtures, such as the four-point beam, to determine the influence of the binder on this behavior.

At CITEVI we use this test to compare a conventional AC-30 asphalt, an asphalt modified with 3.5% SBS and a highly modified asphalt (HIMA) with 7.5% SBS. The results were correlated with Wheel Tracking tests (EN 12697-22) and four-point beam fatigue (EN 12697-24). If the results of each of the tests are compared, it can be seen that there is a clear tendency towards greater resistance to permanent deformation for lower Jnr values. There is an acceptable correlation between the Jnr parameter and rutting depth (R=0.85) as stated by several authors At CITEVI we use this test to compare a conventional AC-30 asphalt, an asphalt modified with 3.5% SBS and a highly modified asphalt (HIMA) with 7.5% SBS. The results were correlated with Wheel Tracking tests (EN 12697-22) and four-point beam fatigue (EN 12697-24). If the results of each of the tests are compared, it can be seen that there is a clear tendency towards greater resistance to permanent deformation for lower Jnr values. There is an acceptable correlation between the Jnr parameter and rutting depth (R=0.85) as stated by several authors. However, the highest correlation was found between the rutting slope and the Jnr at 0.1kPa, as can be seen in Figure 1.

. However, the highest correlation was found between the rutting slope and the Jnr at 0.1kPa, as can be seen in Figure 1.

Category Archives: Noticias Archives - Page 18 of 36 - Bitafal

The first webinar of the High Performance Superficial Treatments Cycle was held.

Serviam began the rehabilitation works that will culminate before the tourist season

Now BItafal has a new product with excellent performance to seal and improve the appearance of pavements

The closure ends on September 1 and surface treatments begin to be seen again in the works.

There are only a few days left for the #interCILA, a digital event that will have news and surprises, and where we will be inviting you to the next XXI CILA in Punta del Este.

Delving into various topics of interest, we begin with a new challenge to share our knowledge

This coming September we will begin to issue the first cycle of conferences that complement and deepen what has been published in our manual on "High Performance Surface Treatments".

One of the questions that arises from the use of modified asphalts is to what extent it is possible to increase the level of polymer in the formula or degree of modification, to further increase the advantages that the modified ones present over the conventional ones.

Intermolecular structure

Figure 1. Scheme of the transformation of the molecular structure of the binders with the increase of a modifying agent. Adapted from Field and Laboratory Study of High-Polymer Mixtures at the NCAT Test Track (2).

Bibliography

Last weekend, those of us who are part of Grupo BItafal were able to enjoy as a family the on-line theater performances of the "Vacations #entretodosparatodos" project.

Bitafal was a keynote speaker in the virtual course of the Ministry of Communications and Transportation (SCT) of Mexico and the Mexican Asphalt Association (AMAAC).

We reviewed some agile tests to estimate performance of asphalt mixes with the DSR.

. However, the highest correlation was found between the rutting slope and the Jnr at 0.1kPa, as can be seen in Figure 1.

. However, the highest correlation was found between the rutting slope and the Jnr at 0.1kPa, as can be seen in Figure 1.

Category Archives:
Noticias Archives - Page 18 of 36 - Bitafal