A water-stabilized crushed stone grading method with large differences in aggregate density

Abstract

The invention discloses a water-stabilized crushed stone grading method with large differences in aggregate densities. When the density difference between two or more main skeleton materials contained in the base mix is ​​greater than 15%, it can be considered that the density of the main aggregate big different. In order to optimize the design of the gradation range, the present invention designs an equal volume replacement method, normalizes the mass of two large-difference density aggregates into the same aggregate material, and deduces the mass sieve converted to the same aggregate particle size size. Remaining conversion formula. Using the recommended grading range calculated by the equal volume replacement method designed in the present invention, the optimized grading cement fly ash stabilized brick-concrete recycled crushed stone specimen was produced, and the cement fly ash produced in the grading range recommended by the current specification was produced. The unconfined compressive strength and splitting strength of the ash-stabilized brick-concrete recycled crushed stone mixture were compared, and the physical properties were optimized obviously.

Description

technical field [0001] The invention generally relates to road building materials, and in particular relates to a water-stabilized crushed stone grading method with large differences in aggregate density. Background technique [0002] The traditional design method of water-stabilized crushed stone adopts the gradation of mineral materials of different thicknesses, and is designed in accordance with the current specification "Technical Specifications for Construction of Highway Pavement Base Layers" (JTG / T F20-2015), without considering that there are two kinds of mixtures and two kinds of mixtures. There are more than one main skeleton, and the density of each main skeleton is quite different. The commonly used gradation design theories are particle interference theory and maximum density curve theory. Both theories assume that the aggregates in the same mixture have the same density. That is to say, no matter which theory it is, the gradation design theory of aggregates i...

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Problems solved by technology

According to statistics, more than 500 million tons of solid waste are generated every year due to the demolition of buildings (structures) in my country, most of which are large-scale and difficult-to-degrade waste concrete, and most of them are stacked in the open air and buried in low-lying areas. Without any treatment, it has caused serious environmental pollution and waste of resources, which does not meet the needs of sustainable ecological development.

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