High-strength and high-toughness reactive powder concrete of carbon doped nano-tube and preparation method of high-strength and high-toughness reactive powder concrete

Abstract

The invention provides high-strength and high-toughness reactive powder concrete of a carbon doped nano-tube. The high-strength and high-toughness reactive powder concrete is prepared by taking cement, a carbon nano-tube, silica fume, a water reducing agent, silica sand, coal ash, quartz powder, steel fiber and water as raw materials, wherein all the components in the mixture are calculated in parts by mass: 1000-1200 parts of cement, 250-350 parts of silica fume, 250-350 parts of slag powder, 40-50 parts of water reducing agent, 1200-1400 parts of silica sand, 180-230 parts of water, 190-230 parts of steel fiber, 180-250 parts of coal ash, 80-120 parts of quartz powder, 0.1-5 parts of carbon-nano-tube dispersing agent and 1-10 parts of carbon nano-tube powder. The invention also provides a preparation method of the high-strength and high-toughness reactive powder concrete. The reactive powder concrete obtained by the invention has the high compression strength of 250-300MPa and breaking strength of 45-60MPa, which are higher than the 200-level related performances of the traditional RPC (Reactive Powder Concrete). Meanwhile, the initial cracking strength of the reactive powder concrete material prepared by using the carbon nano-tube is greatly improved and is up to 10MPa in a direct stretching state, and the tensile strain corresponding to peak stress is up to more than 0.5%, so that the toughness and strength of the traditional RPC material are greatly improved.

Description

technical field [0001] The invention relates to the field of building materials, and belongs to a cement-based composite material with ultra-high strength and high toughness, in particular to an active powder concrete doped with carbon nanotubes and a preparation method thereof. Background technique [0002] Reactive Powder Concrete (Reactive Powder Concrete) is a super-high-strength, high-durability, cement-based material developed in the 1990s by French Pierre Richard et al. using conventional materials following high-performance concrete. According to the principle of closest packing, RPC material adopts high-density cement-based uniform system model, uses 400-600 micron quartz sand as aggregate, and mixes a certain volume of micro-steel fiber and active minerals, and is equipped with forming pressure and heat treatment Conservation and other methods to prepare ultra-high-strength cement composite matrix materials. According to its composition and heat treatment method, ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a high-strength and high-toughness active powder concrete doped with carbon nanotubes. The cost of the active powder concrete in the prior art is relatively high, and in practical engineering applications, the compressive strength of the active powder concrete Compared with the problem of low strength of foreign products, the cracking strength and tensile strain performance of reactive powder concrete can be improved by adding carbon nanotubes, and the compressive strength under normal temperature and heat curing conditions can also be improved.

Images