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High-performance concrete prepared by adopting rice hull ash, silicon ash and graphene oxide as admixtures and preparation method thereof

A high-performance concrete and admixture technology, applied in the field of building materials, can solve the problems of few or few super-high-strength high-performance concrete, and achieve the effects of improving mechanical properties, improving efficiency, and improving microscopic cracks

Inactive Publication Date: 2018-08-24
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, there are very few studies on the effect of graphene oxide on concrete, and even less research on ultra-high-strength high-performance concrete

Method used

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  • High-performance concrete prepared by adopting rice hull ash, silicon ash and graphene oxide as admixtures and preparation method thereof
  • High-performance concrete prepared by adopting rice hull ash, silicon ash and graphene oxide as admixtures and preparation method thereof
  • High-performance concrete prepared by adopting rice hull ash, silicon ash and graphene oxide as admixtures and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. The preparation process of high-performance concrete prepared by using rice husk ash, silica fume and graphene oxide as admixtures:

[0025] (1) The preparation process of the composite admixture: After the rice husk was incinerated at low temperature for 1 h, it was ground for 1 h with a ball mill to obtain nano-SiO 2 Rice husk ash with a content of more than 90% is mixed with silica fume and graphene oxide to obtain a composite admixture.

[0026] (2) Then mix cement, admixtures, coarse aggregate, fine aggregate, water reducing agent and water according to specific proportions to prepare high-strength and high-performance concrete.

[0027] The graphene oxide (GO) used was the graphene oxide aqueous solution of Suzhou Carbonfeng Technology Co., Ltd. (Suzhou Carbon), see Table 1 for details; the silica fume used was purchased from Elkem International Trade (Shanghai) Co., Ltd., model 920U, cement Purchased from Guangzhou Zhujiang Cement Co., Ltd., it is Jinyang bra...

Embodiment 2

[0046] On the basis of the test results obtained in Example 1, it can be seen that when the compounding ratio of silica fume and rice husk ash is 10%SF+2%RHA, the effect of synergistically improving the performance of cement-based materials is the best, so 10%SF+2%RHA is used %RHA compounded instead of cement as the benchmark group, under a fixed water-cement ratio, explored the effect of different content of graphene oxide (0%, 0.001%, 0.005%, 0.01%) on the working performance and mechanical properties of ultra-high-strength high-performance concrete influences.

[0047] Concrete was prepared according to the formula in Table 5, and the performance test results of the concrete are shown in Table 6.

[0048] Table 5 Formulas for preparing high performance concrete with rice husk ash, silica fume and graphene oxide as composite admixtures

[0049]

[0050] Note: The amount of water needs to deduct the water contained in the GO aqueous solution

[0051] Table 6 Performance ...

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Abstract

The invention discloses high-performance concrete prepared by adopting rice hull ash, silicon ash and graphene oxide as admixtures and a preparation method thereof. The concrete per cubic meter comprises, by weight, 600-720 parts of cement, 50-100 parts of admixtures, 850-1,000 parts of coarse aggregate, 550-650 parts of fine aggregate, 90-130 parts of water and 13-25 parts of water reducing agent, wherein the admixtures are composed of the rice hull ash, silicon ash and graphene oxide according to the mass ratio of (2-10):(2-10):(0.001-0.01). According to the high-performance concrete, the rice hull ash, silicon ash and graphene oxide are adopted as the admixtures, the raw materials of the three kinds of admixtures are mutually activated, the early and later strength of the concrete can be improved, microscopic cracks of the concrete can also be effectively avoided, and the working performance and mechanical properties of the concrete can be improved. Meanwhile, the adopted admixturesrelieve the pressure of the high-strength concrete on supplying silicon ash and superfine slag powder, the utilization rate of the agricultural waste such as the rice hull as is also increased, and the requirement of sustainable development is met.

Description

technical field [0001] The invention belongs to the field of building materials, and more specifically relates to a high-performance concrete prepared by using rice husk ash, silica fume and graphene oxide as admixtures and a preparation method thereof. Background technique [0002] With the rapid development of nanotechnology, graphene has become a research hotspot in the scientific community. Their unique structure and excellent performance can play a huge role in inhibiting or even preventing the initiation and expansion of micro-cracks in cement paste, effectively improving the mechanical properties of concrete. . [0003] Graphene oxide is a product obtained by stirring and exfoliating or ultrasonically dispersing graphite after oxidation treatment. As an intermediate product of graphene prepared by redox method, the oxygen-containing functional groups (such as carboxyl, hydroxyl, epoxy) on the surface make it It has excellent hydrophilicity and can be uniformly disper...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/101C04B18/146C04B14/024C04B14/02C04B14/048C04B24/24
Inventor 欧阳东许可悦
Owner JINAN UNIVERSITY
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