Nano-material composite concrete with super high performance

Abstract

The invention relates to a preparation technology for concrete with super high performance, and belongs to the field of concrete technology in civil engineering. The invention is characterized in that: 1 m<3> of concrete contains 380 to 420 kg of cement, 680 to 740 kg of fine aggregate, 1120 to 1190 kg of coarse aggregate, 130 to 160 kg of water, 50 to 75 kg of fly ash, 25 to 64 kg of silica fume, 6.1 to 10.4 kg of a high performance water reducer, 0.05 to 0.25 kg of multi-walled carbon nanotubes and 15 to 25 kg of nanometer silica. The preparation technology is to carry out mechanical stirring for 180 to 240 seconds. The carbon nanotubes are added in the form of dispersion liquid, and a dispersant is cetyl trimethyl ammonium bromide (C16TAB), wherein the dispersion liquid is prepared according to the following portion MWNRs : C16TAB : water = 0.48 g : 4.1 g : 40 ml. The invention enables the super high performance concrete to have an enhanced mechanical property and lasting quality, a drastically increased service life, and capacity of being used in projects where requirements for the performance of concrete are high, for example, large-scale cross-sea bridges, super high buildings, and the like. The invention has a high utility value.

Description

technical field [0001] The invention belongs to the technical field of civil engineering concrete, and relates to an ultra-high-performance concrete preparation technology, in particular to preparing high-performance concrete by compounding nano silicon dioxide and carbon nanotubes. Background technique [0002] Since the invention of Portland cement in 1824, cement concrete materials have a history of more than 100 years. Cement concrete has become an important structural material for modern engineering structures such as civil engineering, water conservancy engineering, and transportation. As the most bulk man-made building material in civil engineering, cement concrete is used in a huge amount. According to statistics, the current annual concrete consumption in my country is about 109 cubic meters, and with the acceleration of industrialization and urbanization in my country in recent years, its consumption will continue to grow rapidly. [0003] After mankind entered t...

AI Technical Summary

Problems solved by technology

According to different structures, it can be divided into two types: single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs). SWNTs are expensive and are generally used in fields such as field emission flat panel displays and sensors, while MWNTs are relatively low in cost. For the research of reinforced composite materials, the matrix materials that have been studied more include polymer matrix, metal matrix and ceramic matrix. There are few studies on reinforced concrete and other cement-based composite materials, and they are currently in the initial and exploratory stage.

[0012] The existing high-performance concrete technology is basically formulated with high-efficiency water reducers, various mineral admixtures, and high-quality aggregates. The disadvantage is that it still cannot meet the requirements of ultra-high performance

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