Foamed Asphalt Archives

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

RECYCLED foamed bitumen - ROUTE 102

The CVC recently started with recycling Route 102 using recycling technology in situ foamed bitumen. Thanks to the high yields of the technique is expected to have completed the tasks leaving a strong and flexible for future interventions take place only in the surface layer basis in about a month.

BITAFAL group HIGH PERFORMANCE EMULSION -BITAFLEX IRRIGATION 65 P40 -

The work consists of milling the previous route, due to the large cracking had the same block, the application of cement, recycled asphalt with added foaming and water, compaction and final grade. Then applying a curing irrigation awaiting a thin asphalt with conventional asphalt.

On the one hand, this intervention makes it clear the maintenance backlog that had this route of great importance for heavy vehicle traffic at the entrances of Montevideo and to the port. We must become conscious that interventions at the right time require less investment in maintenance.

De todas maneras, esta experiencia en conjunto con varias a nivel nacional, demuestran una vez más la importancia de estos equipos de reciclado en el aprovechamiento de nuestro patrimonio vial. La reutilización de materiales de calidad aplicados con maquinarias de alta tecnología abre nuevas fronteras en la construcción de nuestros caminos y carreteras.

Share photos of the work in progress.

SUCCESSFUL APPLICATION RECYCLING ASPHALT WITH FOAM

We can proudly say that the Uruguayan road has become unrivaled in the last five years. The design engineers have proposed and accepted new technologies, builders have art equipment incorporating the first world countries and we are encouraging, but we shake the pulse, to innovate.

Who would have thought that in our country the technologies to be introduced as modified asphalts based massively?

Who would have thought that the surface treatments and micros with modified asphalts would apply on routes first order?

Who would have thought it stabilize soils with continuous and mobile equipment was to be imposed so quickly?

Only the technical results obtained are certifying all these advances.

The most recent milestone of new technologies pushed him over the past year the company Hernández and González S.A. making a bet unmatched in his work of Route 3. Sparing no technical or economic efforts, the company conducted a site recycling pavement with asphalt foam backed administration. In last December he was terminated the reference work and drove around in full, being able to observe the same high quality in all its aspects.

an expansion platform a recycling of all of the existing road asphalt foam and asphalt mixture of 5 cm thick, several sections with widening of a third rail verges stabilized in situ with cement and waterproofed with asphaltic treatment was performed modified emulsions.

All this work was done in less than 100 working days. As we all know, when Hernandez is proposed, it does, but beyond personal effort, its staff and technology built in Germany show that can be reconstructed 34 km of a road completely new with a guarantee of over 20 years only 100 working days.

This is the reality we want to emphasize, if we want a Uruguay with very good infrastructure, we must use the best technology, the most productive and advanced end up being the most economical and durable.

This result is part of an innovation process together among the companies that participated in the Wirtgen Technology Days 2014 held in Germany, which agreed to bring in conjunction with H & G, Meliter, CVC and Tradinter a South African technician for the purpose of a conference the virtues of applying technologies foamed bitumen (Bulletin October 2014).

This process continued with the addition of equipment and technologies required for their application and hard work in laboratory design all involved. They were also required many hours of training, briefings and of course hard to successfully implement this advanced technology work in the country.

As anecdotario plus all innovations in this work, conducted jointly develop gravillados hot applied in July, during the winter closed season with a very good technical and result only applied at low temperatures in our country (Bulletin July 2016)

All photos: ON HERE

Modified Asphalt foam (BITAFLEX AME) for recycling cold spot | New product

SPECIAL BITAFAL ASFALTOS It has recently added to its product line Asphalt Modified Foam (BITAFLEX AME) Seeking to improve and standardize the quality of asphalt used in cold recycling technology in situ and also to use it in cold weather increasing work performance.

These properties are verified by foaming curves, which consist of measuring the maximum occupied by the asphaltic foam volume and time required for that volume is reduced to half. These curves characteristic parameters expansion and half-life are obtained.

In the graphs below a comparative behavior expansion and half-life shown 160C for national versus AC 20 bit FLEX AME.

AME BITAFLEX components provide a better quality foam specific surface area and duration, with a half life time expansion and more than double than conventional asphalt refinery. They ensure a decrease in surface tension with the consequent reduction in viscosity at the time of foaming.

These factors allow provide the following advantages:
* A better dispersion of the foam on aggregates favoring adhesion of the binder with the stone.
* Lower foaming temperature, saving on heating and facilitating logistics work.
* The possibility of recycling in cold weather.
* Improved mechanical properties of the processed mixtures.

We invite you to learn more about this product on our website.

Foam Asphalt Laboratory | Technology in the CITEVI

Accompanying the development of new technologies of cold recycling in situ foamed bitumen, the sion It has incorporated specific equipment for the design of new foam asphalts and evaluation of the characteristics of the processed mixtures.

They have incorporated a device for foaming asphalt, the Wirtgen WLB 10 S and mixer blades attachable to the equipment for preparing foamed bitumen mixtures The Wirtgen WLM 30. Furthermore stoves have been incorporated and accessories press multifunction account Center to carry out the relevant tests.

In recent months the company CVC has worked in the CITEVI in the design and evaluation of foam bitumen stabilized materials (BSM) and subsequently evaluating the path made of Route 36.

He sion is a research center open to the national road middle and invite interested parties to make us your inquiries.

Cold Recycling Wirtgen Group Seminar | December 2015 - Sao Paulo, Brazil.

It was held in Sao Paulo, Brazil, last December, a technical seminar organized by cold recycling Wirtgen Group.Uruguayans participated more than 15 technicians of various construction companies, MTOP, of Tradinter and Bitafal group. There were also delegations from various countries in South America, reaching about 200 participants.

Los temas tratados en el seminario fueron sobre la tecnología de reciclado en frío y de la estabilización con asfalto espumado específicamente. Se realizaron charlas técnicas sobre las propiedades y comportamiento de materiales estabilizados con asfalto espumado (BSM – Bitumen Stabilized Material) y un taller sobre asfalto espumado y materiales BSM en el impresionante laboratorio central de la concesionaria CCR Nova Dutra.

Asphalt arena (1)

Esta tecnología es ideal para tramos exigidos como el existente entre San Pablo y Guarulhos que cuenta con más de 200.000 vehículos por día (la mayoría de ellos camiones y ómnibus) tanto por la resistencia del BSM como por la velocidad de ejecución, que se realiza en unas cinco horas únicamente durante la noche. Por otra partes es una tecnología económica y sustentable ya que utiliza el material de base y asfalto existente, 1% del cemento y un 2% de asfalto espumado solamente.

A very interesting experience thus acquired knowledge, as both made the links between the Uruguayan delegation, as with other delegations present. It is very important that all couples involved in the development of technology in the country have participated, showing interest and commitment to these first test sections in Uruguay are successful.

Wirtgen Group shared presentation

First stages of cold recycling with foam asphalt | Bringing Theory to Practice

The first sections of pavement recycling foamed bitumen are a reality and are projected as an economic and sustainable solution for the rehabilitation of roads.

Since incorporation by BITAFAL RENTALS of the first recycling train in situ in Uruguay in 2013, it has advanced very quickly in the national road system to incorporate technology in all its variants.

Recently they have begun to implement the first sections in situ foamed bitumen. The company Hernandez & Gonzalez has carried out the first tests on Route 12 and is starting this March with work on Route 3 after several months of design laboratory and learning with South African technicians who have come to assist with the implementation of the technology.

Moreover the company CVC has recently completed a stretch of Route 36 in the department of Canelones, with great success. He BITAFAL group He has supported projects in both asphalt and logistics sion with facilities and equipment for the proposed Route 36

We thank our customers for the continued trust placed in the company to realize the implementation of new technologies in Uruguay.