Cement stabilized macadam micro-cracking additive and application thereof

Abstract

The invention discloses a cement stabilized macadam micro-cracking additive and application thereof. The micro-cracking additive comprises a main component, an auxiliary component and water, wherein the main component is selected from one or a combination of more of fatty glyceride, polyoxyethylene ether-20 oleoyl castor alkyd ester and waterborne bisphenol A epoxy resin emulsion; and the auxiliary component is selected from one or a combination of more of mineral fibers, a curing agent, an emulsifier, a stabilizer and a dispersing agent. After the micro-crack additive is doped into a cement stabilized macadam material, aggregate-mortar interface bonding is randomly weakened, so that shrinkage of a mortar phase is randomly dispersed in an aggregate system, and cracks in a traditional semi-rigid base layer are prevented from expanding and communicating to form long and wide cracks; a series of problems caused by length and width cracks and slab staggering of traditional cement stabilized macadam can be thoroughly solved; and later excavation type repair measures are avoided, the engineering maintenance capital investment is greatly saved in the whole life cycle, and the economic benefits of the whole life cost are remarkable.

Description

technical field [0001] The invention belongs to the technical field of road materials and road surface structures, and in particular relates to a cement-stabilized gravel microcracking additive and its application. Background technique [0002] Cement-stabilized macadam (semi-rigid) base is the most commonly used type of load-bearing base for road pavements of all grades in my country, but cement-stabilized macadam is prone to shrinkage cracks and plate fractures, which in turn induce a series of secondary formations such as reflection cracks in the asphalt surface. Diseases can accelerate the deterioration of pavement performance. Cracks in the base layer are concealed, and the cost of detection and treatment is high. Once damaged, it usually needs to be "opened and gutted" to dig out and rebuild, which is a chronic problem that affects the longevity of the semi-rigid base asphalt pavement. [0003] For a long time, road workers have tried to improve the self-resistance of ...

AI Technical Summary

Problems solved by technology

However, from the perspective of concrete materials, the amount of cement used in cement-stabilized gravel is less (about 5%), the mortar water-cement ratio is larger (about 1.0), the aggregate strength and particle shape are poor, and the strength of cement-stabilized gravel formed by rolling is , modulus, shrinkage coefficient and other parameters are in a relatively complex combination state, due to the existence of a large number of weak bonds and initial defects between particles, the inhomogeneity of cement stabilized macadam on the mesoscopic scale is very significant

The degree of improvement of homogeneity through materials and construction techniques is far lower than its own inhomogeneity, superimposing the uneven support of the underlying layer, and the plate fracture of the cement-stabilized gravel base under long-term load is inevitable; at the same time , the weak bond caused by the interface defects of traditional cement-stabilized gravel aggregate-mortar is not weak enough to enable random cracking during the process of temperature shrinkage and shrinkage, and the board properties of the cement-stabilized gravel base can be preserved to a certain extent It is easy to form long and wide through cracks

The traditional method of increasing the amount of cement to improve the crack resistance of cement-stabilized gravel will increase its shrinkage coefficient at the same time. Natural cracking or artificial pre-cutting will produce long and wide cracks, which will induce reflection cracks, and the research will fall into a bottleneck.

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