Grading method for water-stable broken stone with large aggregate density difference

Abstract

The invention discloses a grading method of water-stable crushed stones with large aggregate density difference, and when the density difference of two or more than two main framework materials contained in a base mixture is greater than 15%, the density difference of main aggregates can be considered to be large. In order to optimize the grading range design, the invention designs an isovolumetric replacement method, normalizes the two aggregates with large different densities into the mass of the same aggregate material, and derives a screen residue conversion formula for converting the mass of the same aggregate particle size. A grading recommendation range is calculated by adopting an isovolumetric replacement method designed by the invention, and a cement fly ash stable brick-concrete regenerated broken stone test piece subjected to optimized grading is manufactured. Compared with the unconfined compressive strength and splitting strength performance of a cement fly ash stabilized brick-concrete regenerated gravel mixture test block manufactured in the grading range recommended by the current specification, the physical performance optimization is significant.

Description

technical field [0001] The present invention generally relates to road building materials, in particular to a method for grading water-stabilized crushed stones with large differences in aggregate density. Background technique [0002] The traditional water-stabilized crushed stone design method adopts mineral material gradation of different thicknesses, and is designed according to the current specification "Technical Rules for Construction of Highway Pavement Base Course" (JTG / T F20-2015), and does not take into account when there are two kinds of mixed materials and two kinds of mixed materials. There are more than one main skeleton, and the density difference of various main skeletons is large. The commonly used gradation design theories are particle interference theory and maximum density curve theory. Both theories assume that the aggregate density in the same mixture is the same. That is to say, no matter which theory it is, the gradation design theory of aggregates...

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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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