Single-particle-size cement stabilized macadam crack-resistant mixture as well as design method and application thereof

Abstract

The invention discloses a single-particle-size cement stabilized macadam crack-resistant mixture as well as a design method and application of the single-particle-size cement stabilized macadam crack-resistant mixture. The method comprises the following steps: (1) determining the grading composition of coarse and fine aggregates; (2) respectively measuring the apparent relative densities rho c, rho f and rho s of the coarse aggregate, the fine aggregate and the cementing material; (3) measuring the tight loading bulk density rho (s) c of the coarse aggregate, and calculating the void rate VCA; (4) determining the cement dosage and the design gap Vv of the mixture; (5) calculating the proportion of the coarse aggregate and the fine aggregate according to qc + qf + qs = 100; (6) carrying out a compaction test to obtain the maximum dry density and the optimal water consumption; and (7) forming the test piece according to the maximum dry density and the optimal water content. According to the method, the embedding and extruding effect of the main framework is emphasized, the filling and bonding effects of the fine aggregate are fully utilized, the embedding and extruding principle and the filling principle are organically combined, the pavement performance is guaranteed, meanwhile, the cracking phenomenon is reduced, the service life of the pavement is prolonged, and remarkable economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of road construction, in particular to a single-particle-size cement-stabilized gravel anti-cracking mixture in road engineering and its design method and application. Background technique [0002] More than 90% of my country's highways are semi-rigid base asphalt pavement, and the most widely used semi-rigid material is cement-stabilized macadam. This is because semi-rigid materials can provide higher pavement bearing capacity and lower cost. Although the semi-rigid base has the above advantages, it also has its own defects that are difficult to overcome: the semi-rigid base is prone to shrinkage (dry shrinkage and temperature shrinkage) cracks, which will cause reflective cracks in the asphalt surface, and then rainwater will enter the pavement structure and accelerate the pavement. destroy. [0003] The most common cracks in asphalt pavement are reflection cracks caused by shrinkage cracking of semi-rig...

AI Technical Summary

Problems solved by technology

Although the semi-rigid base has the above advantages, it also has its own defects that are difficult to overcome: the semi-rigid base is prone to shrinkage (dry shrinkage and temperature shrinkage) cracks, which will cause reflective cracks in the asphalt surface, and then rainwater will enter the pavement structure and accelerate the pavement. destroy

On the one hand, it destroys the integrity and continuity of the pavement structure, reduces the flatness of the pavement, and affects driving comfort; Between the rigid base layer and the surface layer, under the action of driving dynamic load, a large hydrodynamic pressure is generated, which scours the base layer, causing water damage to the base layer, and at the same time reduces the bonding state between the surface layer and the base layer, resulting in cracks and pits A series of diseases and other diseases, and then sharply reduce the performance of the pavement, affecting the service life of asphalt pavement

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