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Cement-based recycled concrete

A recycled concrete and cement-based technology, applied in the field of building materials, can solve problems such as large heat of hydration, easy expansion of gel system volume, concrete cracking, etc., and achieve the effects of increased reuse rate, good synergy, and satisfactory performance

Pending Publication Date: 2021-08-13
BEIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the doping of silica fume can promote the hydration reaction to a certain extent, it also has the disadvantage that the volume of the gel system is easy to expand due to the large heat of hydration, which leads to the cracking of the concrete when it is solidified.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The cement-based recycled concrete prepared in this embodiment consists of the following raw materials:

[0045] P·O 42.5 Portland cement 21.6 parts, 0.1-75 μm waste granite stone powder 11.52 parts, 0.1-0.3 μm silica fume 2.88 parts, 1-5mm river sand 45.57 parts, 5-10mm gravel 60.45 parts, water 18 parts and 0.335 parts of water reducing agent;

[0046] Among them, the mass ratio of waste granite powder and silica fume is 4:1, the water reducing rate of the water reducing agent is 18%, and the composition of silica fume is SiO 2 93.24%, Al 2 o 3 3.16%, Fe 2 o 3 1.61%, CaO 1.42% and MgO 0.57%.

Embodiment 2

[0048] The cement-based recycled concrete prepared in this embodiment consists of the following raw materials:

[0049] P·O 42.5 Portland cement 21.6 parts, 0.1-75 μm waste granite stone powder 11.52 parts, 0.1-0.3 μm silica fume 2.88 parts, waste granite aggregate 79.98 parts, 1-5 mm river sand 45.57 parts, 5-10 mm 60.45 parts of gravel, 18 parts of water and 0.335 parts of water reducer;

[0050] Among them, the mass ratio of waste granite powder and silica fume is 4:1, waste granite aggregate is waste granite coarse aggregate and waste granite fine aggregate, the particle size of waste granite coarse aggregate is 5-9.5mm, waste granite fine The particle size of the aggregate is 3-4.9mm, and the mass ratio of the waste granite coarse aggregate to the waste granite fine aggregate is 3.10:1, the water reducing rate of the water reducing agent is 18%, and the composition of silica fume is SiO 2 93.24%, Al 2 o 3 3.16%, Fe 2 o 3 1.61%, CaO 1.42% and MgO 0.57%.

Embodiment 3

[0052] In Example 2, the mass ratio of the waste granite coarse aggregate to the waste granite fine aggregate is replaced by 6.19:1, and the mass fraction of crushed stone is replaced by 0, and the rest of the technical features are the same as in Example 2.

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Abstract

The invention provides cement-based recycled concrete, and relates to the technical field of building materials. According to the invention, the waste granite stone powder and the silica fume are simultaneously doped to replace part of cement, and the ratio of the waste granite stone powder to the silica fume is adjusted, so that the waste granite stone powder and the silica fume can play a good synergistic effect and a complementary effect under the condition of reducing the use of cement raw materials; therefore, the problems of low activity of the doped granite waste stone powder and cracking in a curing stage caused by hydration volume expansion of the silica fume are solved, and the mechanical property and durability of the cement-based recycled concrete are effectively improved; and the performance of the cement-based recycled concrete meets the use requirements, the reutilization rate of the waste granite is effectively improved, and resource reutilization is realized.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a cement-based recycled concrete. Background technique [0002] Due to its fine structure and hard texture, granite stone is widely used in the construction of hard landscapes such as urban buildings, municipal roads, garden sculptures, and architectural sketches. However, a large amount of stone waste and waste stone powder are produced during the mining and processing of granite, which is difficult to recycle, resulting in serious resource waste and environmental pollution. A large number of studies have shown that granite stone powder is an inert substance, basically inactive, resulting in a low recycling rate of granite stone powder, and it needs to be compounded with other active materials to make it more widely used in the preparation of recycled concrete. [0003] The existing active admixtures include fly ash, blast furnace slag, silica fume, etc. Among them, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/20
CPCC04B28/04C04B2201/50C04B2111/20
Inventor 蒙彦宇关海爽杨帆郑新亮孟宪强马光述牛伯羽曲广雷
Owner BEIHUA UNIV
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