Abstract
The paper considers a possibility to use sand asphalt concrete as a material for protection of asphalt concrete and cement concrete road pavements against affection of external destructive factors. Advantages and disadvantages of sand asphalt concrete road pavements have been determined in the paper. The paper provides recommendations on improvement of sand asphalt concrete properties and contains an analysis of possible variants for usage of complex-modified sand asphalt concrete in the road construction. It has been noted that according to its potentially possible physical and mechanical properties activated quartz sand being micro-reinforced by dispersive industrial wastes is considered as an efficient component for creation of constructive layers in road asphalt concrete pavements. The paper reveals only specific aspects of the efficient application of quartz sand in road asphalt concrete. The subject of the paper loоks rather interesting for regions where there are no rock deposits for obtaining broken-stone ballast but there is rather significant spreading of local quarts sand. Its successful application is connected with the necessity to develop special equipment for physical and chemical activation of sand grain surface that permits strongly to increase an adhesive strength in the area of phase separation within the “bitumen–SiO2” system. The considered problem is a topical one and its solution will make it possible to local sand in a maximum way and partially to exclude application of broken stone in road construction.
Highlights
Строительство are no rock deposits for obtaining broken-stone ballast but there is rather significant spreading of local quarts sand
Its successful application is connected with the necessity to develop special equipment for physical and chemical activation of sand grain surface that permits strongly to increase an adhesive strength in the area of phase separation within the “bitumen–SiO2” system
Однако это оказалось невозможным при данном техническом состоянии асфальтобетонных заводов: для решения проблемы требуется разработка усовершенствованного технологического процесса приготовления песчаных асфальтобетонных смесей на основе газовой технологии
Summary
Строительство are no rock deposits for obtaining broken-stone ballast but there is rather significant spreading of local quarts sand. Для предотвращения дальнейшего разрушения покрытия при его шелушении и выкрашивании необходимо проведение защитных мероприятий: устройство слоя износа или обработка пропиточными составами. На эксплуатационную долговечность цементобетонных покрытий также оказывают влияние процессы, происходящие при твердении цементобетонной смеси в период строительства покрытия [7].
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