Crack resistance type cement stabilized macadam proportioning design method based on vibration test method

Abstract

The invention discloses a crack resistance type cement stabilized macadam proportioning design method based on vibration test method. The design method is implemented according to the following steps:(1) preparing framework dense graded aggregate; (2) adding cement into graded aggregate to obtain a cement stabilized macadam mixture, and adopting vibration compaction test method to determine the maximal dry density and the optimal water content of the cement stabilized macadam mixture, wherein the added cement dosage accounts for 3-5% of the graded aggregate according to mass percent; (3) adopting the cement stabilized macadam mixture in step (2) and vibration compaction test method to prepare a cement stabilized macadam cylinder test piece with the dimension being 15cm in diameter * 15cmin height; (4) carrying out an unconfined compression strength test on the cement stabilized macadam cylinder test piece which is subject to 6 days of preserving and 1 day of water soaking, and designing the cement dosage according to the result of the unconfined compression strength test. The cement stabilized macadam designed by the invention can better form a compact framework structure, featuring unlikely dissociation, the maximal dry density, the optimal water content and saving of 30-40% cement use amount, has the advantages of high strength, good crack resistance and good scour resistance, and basically solves the problems of serious crack of cement stabilized macadam which perplexes road engineering circles, at home and abroad, all the time.

Description

technical field [0001] The invention is applied to the field of traffic civil engineering, and relates to a method for designing the mix ratio of anti-cracking cement-stabilized gravel based on a vibration test method. Background technique: [0002] The mix ratio of cement stabilized crushed stone mainly involves mineral mixture gradation, cement dosage, maximum dry density ρ dmax and the optimum water content w o . The principle and test steps of the current cement-stabilized crushed stone mix ratio design method are as follows: [0003] (1) The mineral mixture grading range of cement-stabilized crushed stone meets the requirements in Table 1. Determine the gradation of aggregates of various specifications according to the fine aggregate screening test method (T0327-2000) and coarse aggregate screening test method (T0302-2000) in the "Highway Engineering Aggregate Test Regulations" (JTJ058-2000). The gradation of aggregates of various specifications and the gradation ra...

AI Technical Summary

Problems solved by technology

[0011] ①The compaction method lags behind the actual production

[0012] ② The water content test method is unscientific

[0013] ③ Poor simulation effect, poor test reproducibility and complicated operation

[0015] ① The compaction method does not match the static compaction preparation method;

[0016] ② The test piece prepared by static compaction method does not meet the conditions of the actual vibratory rolling forming base, and the composition structure of the prepared test piece does not match the actual rolling forming base structure;

[0017] ③The crushing of the coarse aggregate during the preparation of the test piece is more serious, and the gradation of the prepared test piece does not match the gradation of the actual base layer formed by rolling;

[0018] ④ The loss of water content in the preparation process of the test piece is relatively serious, and the water content of the prepared test piece does not match the water content of the actual rolling-formed base;

[0019] ⑤The crushing of the coarse aggregate during the preparation of the test piece leads to gradation changes, and the loss of water content leads to a decrease in the actual dosage of the inorganic binder, etc., resulting in a discrepancy between the physical and mechanical properties of the test piece and the actual formed base layer

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