Preparation and application of dry powder mortar for self-compacting concrete of slab ballastless track

Abstract

The invention relates to preparation and application of dry-mixed mortar for plate-type ballastless track self-compacting concrete. The dry-mixed mortar is prepared by mixing cement, a mineral additive, fine aggregate, a water-reducing and collapse-preventing component, an expanding component, a viscosity adjusting component and fiber according to a certain ratio, wherein 100 parts of cement, 50-120 parts of the mineral additive, 150-400 parts of the fine aggregate, 0.2-3 parts of the water-reducing and collapse-preventing component, 5-20 parts of the expanding component, 1-10 parts of the viscosity adjusting component and 0-0.5 part of the fiber are included. The invention further provides preparation and application of the dry-mixed mortar. The dry-mixed mortar is prepared by a high-speed mixer in a factory; the dry-mixed mortar is transported by a bulk truck or by an automobile in a bagged way; the dry-mixed mortar, coarse aggregate and water are weighed on a construction site in parts by weight and uniformly stirred for use. According to the technical scheme, the sensitivity of the self-compacting concrete to quality fluctuation of the raw materials can be greatly reduced and the loss of the self-compacting concrete can be significantly reduced; the dry-mixed mortar is suitable for a plate-type ballastless track of a high-speed railway, and can also be applied to bridges, civil buildings and the repairing and strengthening field.

Description

[0001] Technical field: [0002] The invention belongs to the field of building materials, and specifically relates to the preparation and application of a dry powder mortar for self-compacting concrete of a slab ballastless track with high stability, low loss, and environmental protection, and is suitable for the closed mold cavity structure of a slab ballastless track of a high-speed railway and other structures . [0003] Background technique: [0004] Realizing the self-filling and self-compacting functions of structures with the intelligent power of concrete materials is a major technological revolution that uses material properties to solve structural durability problems caused by construction factors. As a typical representative of intelligent dynamic concrete, self-compacting concrete has been applied to the CRTSIII slab ballastless track structure with my country's independent intellectual property rights because of its high constructability, technical economy and envi...

AI Technical Summary

Problems solved by technology

[0007] Based on the problems of high loss in the construction process of self-compacting concrete for slab-type ballastless track and uncontrollable working performance of the mixture, the invention creatively adopts the measure of adding aggregate and water on-site to self-compacting concrete dry powder mortar to solve the problem of self-compacting concrete’s quality fluctuation of raw materials , especially the sensitivity to the moisture content of the fine aggregate