Method for preparing RPC (Reactive Powder Concrete) trench cover plate of high-speed railway passenger-dedicated line

Abstract

The invention relates to a method for preparing an RPC (Reactive Powder Concrete) trench cover plate of a high-speed railway passenger-dedicated line. The method is characterized by comprising the following steps of: (1) preparing a mould; (2) preparing slurry, wherein the slurry comprises the following raw materials in parts by weight: 100 parts of silicate cement, 10 parts of siliceous dust, 110 parts of quartz sands, 10 parts of active mineral admixture, 35 parts of quartz powder, 2.5 parts of water reducing agent, 28 to 31 parts of water, and 0.2 part of polypropylene fibers, the silicate cement, the siliceous dust, the quartz sands, the active mineral admixture, the quartz powder and the polypropylene are stirred in a stirrer, the water reducing agent is dissolved with water, and the water reducing agent is added into the stirrer and the residual water is stirred in the stirrer to obtain the slurry; (3) shaking and molding; (4) initially setting; (5) demolding; and (6) maintaining to obtain the RPC trench cover plate of the high-speed railway passenger-dedicated line. By the method, the mechanical performance of the RPC trench cover plate can be improved, the anti-cracking and seepage-proofing performance and duration performance of the RPC trench cover plate can be reinforced, the production cost of the RPC trench cover plate can be reduced, and the preparation process is simple.

Description

technical field [0001] The invention relates to a preparation method of an RPC trench cover plate for a high-speed railway passenger dedicated line, and belongs to the technical field of building materials. Background technique [0002] With the development needs of the modern construction industry and the rapid development of related fields of materials science, cement-based composite materials have been developed rapidly, especially in terms of strength, various high-strength and ultra-high-strength concretes continue to emerge. Mainly include: macro-defect free cement (referred to as MDF), superfine-grained dense cement (referred to as DSP), fiber reinforced cement or concrete (referred to as FRO), ultra-high-strength concrete (referred to as UHSC), ultra-high-strength reactive powder concrete (referred to as RPC) Wait. [0003] RPC is developed on the basis of maintaining the excellent performance of several other ultra-high-strength cement-based composite materials to ...

AI Technical Summary

Problems solved by technology

However, the low output and high price limit it to be widely used in concrete engineering.

In addition, its huge specific surface area (about 200,000 m 2 / Kg), in the process of mixing and forming, it needs a lot of water, which increases the viscosity of concrete, making RPC molding and processing difficult. At the same time, because of the large amount of silica fume added, the plastic shrinkage of concrete is large, which reduces the quality of RPC and cannot be guaranteed.

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