Method for adjusting asphalt mixture aggregate gradation by doping fine sands in desert

Abstract

The invention discloses a method for adjusting asphalt mixture aggregate gradation by doping fine sands in desert. According to the method, a volume and a weight of sands in desert are calculated according to a size of a construction concrete slab and a proportion of desert sands. The raw materials are characterized in that 3-8.5% of asphalt content, 4.5-6.5% of asphalt-aggregate ratio, 30-50% of broken stone with the size of 6.3-10 mm, 5-20% of broken stones with the size of 4-6.3 mm, 25-45% of machine-made sand, 5-10 % of fine sands in desert, and 2-9% of stone flour. The method has the advantages of sands in desert can be effectively used, asphalt amount in a fine sand-doped asphalt mixture is low, porosity amount is low, a flow value is large, compaction is easy, the surface of fine sands particles in desert is round and smooth, so that work performance of the hot asphalt mixture is good.

Description

technical field [0001] The invention relates to a road paving material, in particular to a method for adjusting the aggregate gradation of asphalt mixture mixed with fine sand in the desert. Background technique [0002] At present, according to the above-mentioned existing mature road construction technology in desert areas at home and abroad, road sites are built in oil fields in desert areas, and the investment is very high. In the patent of "Manufacturing and Using Method of Desert Sand Concrete" (publication number CN119173A), it is proposed to use sodium water glass as a cement, Portland cement as a hardener, and disodium hydrogen phosphate as a retarder to manufacture The chemical formula and ratio of desert sand concrete; and it is proposed to mix the retarder solution with Portland cement and then mix it with water glass to form a mixed slurry, and then use a stabilized soil mixer, a forced mixer or artificially mix the water The process of mixing the glass mixture...

AI Technical Summary

Problems solved by technology

But there are three shortcomings: (1) unreasonable maintenance conditions

(2) The use of retarder is not ideal

When disodium hydrogen phosphate is used as retarder, with the increase of its dosage, the initial hardening time of concrete will also be delayed, but after 30-40 minutes, if the dosage of retarder continues to be increased, the concrete will be hardened. It cannot be hardened within a few days and nights, and even if it hardens later, the strength performance will be greatly reduced

(3) Difficulties in process implementation

The process method provided in the original patent application is not difficult in the case of small-scale on-site construction, but in the case of large-scale mobile construction, it is necessary to mix and spray hundreds of tons of slurry with a high viscosity, and then mix it with sand Stir evenly, the difficulty in terms of technology and equipment is quite large

Therefore, the traditional patented formula and process are deficient for road construction and field repair.

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