Highway pavement base layer free of crack and preparation method thereof

Abstract

The invention discloses a highway pavement base layer free of a crack and a preparation method thereof to solve deficiency in the prior art. The highway pavement base layer is made of stirring cement,fine aggregate, coarse aggregate, a coagulation alleviating and water reducing agent and water. The highway pavement base layer comprises, by mass, 5-6% of the cement, 60-69% of the fine aggregate, 22.2-29% of the coarse aggregate, 0.6-3% of the cement amount of the coagulation alleviating and water reducing agent, and the ratio of water to ash is 0.65-0.7. The preparation method comprises the following steps that step 1, the mixed materials are stirred; step 2, paving and additional watering are carried out; step 3, grinding and pressing are carried out; and step 4, maintaining is carried out. The deficiency of semi-rigid base layer air shrinking and cracking is overcome, and advantages of a semi-rigid base layer is kept; pavement bearing capacity is high, shrinkage and cracking do not occur; and highway manufacturing cost is reduced and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of highway construction and manufacturing, in particular to a crack-free highway pavement base and a preparation method thereof. Background technique [0002] At present, the most widely used pavement base for high-grade highways in my country is the cement-stabilized macadam base (hereinafter referred to as the water-stabilized layer). It is beneficial to the distribution of loads, greatly reducing the vertical compressive stress of the subgrade soil and the bending stress at the bottom of the asphalt layer above it; (2) The materials of this pavement base are mainly cement and sand and gravel, which have a wide range of sources and low cost; (3) In my country , the design of asphalt pavement is based on the deflection value of the pavement base. The deflection value of the water-stabilized layer can be very small, and a thinner asphalt layer can be used, thus reducing the amount of asphalt materials and road construct...

AI Technical Summary

Problems solved by technology

That is to say, when the load level and traffic density are the same, compared with the semi-rigid base, the use of a flexible base requires an increase in the thickness of the asphalt concrete surface, which greatly increases the cost of pavement construction.

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