Module 2 - High Performance Surface Treatments Webinar
This is the second module of the cycle "High performance surface treatments". We will share with you the knowledge and experience that we have collected nationally and internationally on these techniques, complementing what our manual with the same name describes.
In this module we are going to focus on the transformation that the evaluation of surface treatments has had, highlighting the difference between traditional tests and new performance tests. We will talk about laboratory and construction tests that improve the final quality of treatments and new ways to evaluate their long-term behavior.
INDEX:
- Performance of a surface treatment
- Loss of stone, loss of texture and cracks
- Testing of materials, in design and construction
- New Zealand experience
- Final reflection
- Closing
You can access the recording below as well as download the presentation.
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.
USE OF THE RHEOMETER TO EVALUATE FOOTPRINT AND FISSURES
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.
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.
. 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.
NEW SEALS SEALING COLD - BITAFLEX PU
CITEVI has developed a new joint sealant applied cold and has high durability and strength.
Sealant Bitaflex PU is a liquid sealant at room temperature in black, of two components formulated with asphalt and polyurethane elastomers which cure when mixed to form a very strong self-leveling material of high elongation properties and good toughness, weathering and as a wide variety of chemicals such as fuels and oils.
It can be used for waterproof sealing of high strength and adhesion in cracks and control joints and expansion in concrete floors (roads, warehouses, factories, etc.) as well as for expansion joints in bridges.
Among the advantages of this new sealant we include:
- It is applied at room temperature without heating.
- exceptional elongation, tolerates the movement of joints.
- Weatherproof, extraordinary resistance to rain and sunlight.
- Resistant to chemical attack.
- It maintains its properties (adhesion and elasticity) for a long time indoors or outdoors.
- Once cured resists continuous immersion in water and other substances.
- Release allows traffic in less than 2 hours.
- Fragua rapidly throughout its thickness, even in deep joints.
Its presentation is in metal pails of 20 kg. Tests were conducted on some bridges and the Port of La Paloma with very good results, we attach images below.
For information, write to: bitafal@bitafal.com.uy
PERFORMANCE OF ASPHALT MODIFIED HIGH
the thesis of Ignacio Kröger Engineers and Carlos Pfeiff on the performance of highly modified asphalts (HiMA) was recently introduced.
Last July 4th fought against the Ing. Magdalena Pastorini, Ing. Arturo Forteza and Lic. Laura Luzuriaga with the final thesis which took more than eight months of intense work on a comparative study between the Hima the AM3 and AC30.
Continue read: REGIONAL MEETING IN BOLIVIA CIVIL ENGINEERING
In this thesis several technical papers to be presented at the 12th Congress of the Road Uruguaya and in the XX IBWC to be held in November in Mexico are released. Moreover it is performing a scaling himâ asphalt plant are preparing the experimental sections to assess their field performance in the long term.
FIRST TRANCHE OF ASPHALT IN URUGUAY HiMA
the first experimental section using highly modified asphalt (HiMA) was performed in Uruguay
The new highly modified asphalt (HiMA) developed by sion, He was executed by Necklace last August in the widening of Route 101. The section in question consists of 600 meters above prior to entering the roundabout junction Nicolich (direction Montevideo) outside lane. The aim of HIMA provide durability to asphalt, primarily because of its outstanding resistance to cracking and permanent deformation.
Continue read: DAY OF THE CHILD IN BARRIO COLONIA Nicolich
The original project consists of a black base with conventional AC-30 asphalt 12 cm on which a road surface with 5 cm AM3 is then applied. Colier was proposed, with the approval of the MTOP, 600 m replace the AC-30 HIMA of which 300 m in thickness was reduced to 10 cm (17% reduction).
Asphalt (17)
And extracted with witness samples of the asphalt plant will proceed to perform tests of dynamic modulus, and fatigue loaded in four-point beam wheel. With structural package information and research, it will proceed to use mechanistic empirical design programs, such as BackViDe (IMAE) to predict their behavior.
We appreciate the confidence Colier MTOP and apply technology to allow himâ for the first time on our roads. The research results will be presented at the XII Congress of the Road Uruguaya on 25, 26 and 27 September and the XX IBWC Mexico 25-29 November.
NEW INDUSTRIAL PLANT
Bitafal group expands its installed capacity by acquiring the plant Urupema
The new plant, located in Barros Blancos at km 27 of Route 8, is the new commitment to develop the local market with new products and reach the regional market with high quality products and technical level.
They are more than 5 ha in area with 2000 m2 of roofed warehouses, plant chemicals advanced and more than 1000 m3 tank where we will develop a new generation of modified asphalts and other products for road maintenance.
He is currently performing a set point and the installation of equipment, an integral vehicle scale and adapted for handling asphalts waiting to be conducting the first tests in tanks next July.
Urupema was a processing plant plasticizers for PVC industry and other chemicals, being a plant that elaborated products both domestically and regionally. The whole plant is functional and adaptable to the preparation of other types of chemical compounds advanced for road maintenance.
CITEVI is working intensively on the development of a new range of innovative products that will be available commercially in the coming months and correspondingly present at events and fairs to participate.
We will keep you informed of developments in the next editions of "Making Roads".
Evaluation of penetration of the aggregate in the bases for surface treatments
Using the penetrometer ball as quality control element base treatment.
In the path that is being traced at the national level to standardize design criteria for surface treatments, we believe the inclusion of the ball penetrometer test is of utmost importance. It determines if the base is in proper condition to receive initial treatment, or if it requires additional work. It is also an indicator of the degree of compaction that has been achieved and the moisture contained in the base. The test was originally developed by South Africans and is also used in Australia and New Zealand to quantitatively measure the penetration potential of aggregate into the base.
En este frío mes de Agosto, junto con Lucio Borelli de CVC, pusimos a prueba este equipo de medición en diversas superficies: bases granulares no ligadas, bases estabilizadas con ligantes (cemento Portland y asfalto espumado) y mezclas asfálticas. A continuación se ilustran algunas de las conclusiones, acompañadas de fotos de la experiencia.
In the initial treatments (surface treatments on bases), the subsidence of the aggregate on the surface always occurs, to a greater or lesser extent. The degree of penetration will depend on the base material, its humidity, compaction and the traffic to which it will be subjected. Not taking these parameters into account results in exudate in the short term, becoming particularly evident in the tracks. The explanation for this phenomenon is intuitive: the tire pressure sinks the stone into a base that allows it and the voids that correspond to the asphalt and the air (to achieve the macrotexture of the wearing course) are occupied by the material of base, causing the asphalt to surface through the stone, which results in exudation in the tracks.
El ensayo que se propone es muy sencillo y de fácil aplicación: consiste en la penetración de una bola de 19 mm de diámetro que es golpeada por un martillo normalizado lanzado de una altura conocida (Australian Standards: AG-PT/T251 – Ball Penetration Test). El valor de penetración queda registrado en el aparato, ya sea en un indicador electrónico o en una regla graduada (que viene incorporada).
Los resultados de este ensayo se utilizan para ajustar la cantidad de ligante a regar o para seleccionar un tratamiento correctivo previo al definitivo. Su uso más importante es quizá el de establecer el límite en el que no se pueden realizar gravillados sin antes recompactar o estabilizar la base, dado que su riesgo de falla es muy elevado.
La primera y más importante de las conclusiones es que la preparación de la base es un factor determinante en los resultados. Un problema común es que las bases presentan un exceso de finos en la parte superior que genera que la bola penetre con facilidad. Aunque parecen estar lisas y homogéneas inicialmente, tan pronto como se barren, una gran cantidad de este material fino se dispersa, dejando una superficie áspera e inconsistente que es problemática para ejecutar un tratamiento.
Another issue to consider is the humidity at the time of the test: if the surface is visibly wet, the penetration gives higher values. We could corroborate this by testing the same surface early in the morning and close to noon. In some cases, the conditions of the base at the time of the test are good, but when a primer is applied, due to capillarity and temperature differences, humidity begins to increase in the first 5 cm, affecting the penetration result.
Developing
BITAFAL enters the world of rheometry
New Reómetro Anton Paar SmartPave 102 at sion It will allow a big step in the performance of asphalt products in Uruguay.
As we announced in an earlier issue of our newsletterThis month installed a Court Dynamic Rheometer (DSR for its acronym in Ingés). This sophisticated equipment allows to know the performance of asphalts much of its viscoelastic range. Mainly we are concerned in these latitudes, that is at medium and high temperatures.
With this tool we can improve the modified asphalts and emulsions to suit the conditions of our country and know within minutes the quality of asphalts used as raw material.
With the addition of equipment, a course of rheology and use of equipment with an expert from the supplier was performed. The course was held on 27 and 28 August in the CITEVI and we have the participation of technical staff of our company, the MTOP and LATU.
This new machine is equipped with accessories for measurements from -20 to 150 ° C both conventional asphalts, as well as some modified properties of emulsions. Typically it used to determine the degree of asphalt (PG) but can be used for other properties of the binders.
Within the novel assays we can discuss the possibility of making master curves where temperatures and voltages applied to see the performance of the binders are varied. It is also possible to test highly accurate adhesion or cohesion at different temperatures, essential for the performance of emulsions for surface treatment tool.
Not so new but convenient is the possibility of viscosities "brookfield" within minutes both 60 ° C to the viscosity curves at the desired temperature range.
These are some of the many tests that can be performed but the team is extremely versatile and has many accessories that allow analyzing from food to paint smoothly.
In the course they made the basics of fluid mechanics, equipment operation and its application to the asphalts were given. It had a practical module to understand the operation of equipment and advanced software that controls and processes data.
Much remains to explore and contribute to our road with this team. We will keep you informed of progress.
