The article reviews the option of how to make top pavement asphalt-concrete mixture adhere reliably base, which is underlying cement-concrete coating. bitumen-latex emulsion suggested as a binder for two layers. research aimed determine optimal layer thickness bituminous-latex be applied and achieve maximum interlayer adhesion between base. After full-scale experiments, required was 2 mm. With ...

For several years, the bituminous laboratory of the Joint High­ way Research Project has been concerned with the testing of bitu­ minous-aggregate mixtures and with the development of knowledge that would lead to an understanding of the properties of bituminous mixtures as satisfactory paving materials. At the Thirty-Eighth Annual Road School, a paper entitled, “Role of the Laboratory in the De...

This study is the beginning of a thesis dealing with the ability of electromagnetic methods based on waves propagation, to replace nuclear ones for measuring the compaction of bituminous mixtures. We study here the permittivity variation in function of compaction level of bituminous samples. For one part, a network analyzer with cylindrical cavities is used to obtain the permittivities of dry b...

A satisfactory bituminous mix should have aggregate gradation, which will ensure maximum density and minimum voids in the mix to fulfill requirements of bituminous mix design specifications. In India organizations such as Indian Roads Congress and Ministry of Surface Transport (MOST) [1] have laid down specifications regarding the range of percentage passing of different size of aggregate in th...

One day in my life concerning coal quality has struck me more than most. We asked a group of utility and power plant people what properties of coal they liked and what caused them concern. As each person provided their response you could see that each had their own view. Some wanted dustless coal, others coal that has good flow through chutes. Many wanted large, lumpy coals, the engineers wante...

Selected carbon-rich refinery residues ('binders') mixed with mineral particles can form composite materials ('bituminous concrete') with bulk mechanical properties comparable to those of cement concrete. The microstructural mechanism underlying the remarkable composite properties has been related to the appearance of a rigid percolating network consisting of asphaltenes and mineral particles [...

Environmental and health aspects of road materials have been discussed for a long time, mostly regarding bitumen and bitumen fumes. However, just a few studies on other types of road materials have been reported. In this doctoral study, two types of materials, asphalt release agents and bituminous sealants, were investigated with regard to chemical characterization and emission profiles. Beside...

Lignin fibers typically influence the mixture performance of stone matrix asphalt (SMA), such as strength, stability, durability, noise level, rutting resistance, fatigue life, and water sensitivity. However, limited studies were conducted to analyze the influence of fibers on the percent voids in mineral aggregate in bituminous mixture (VMA) during the mixture design. This study analyzed the e...