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A kind of wear-resistant ultra-high performance concrete and preparation method thereof

An ultra-high-performance concrete technology, applied in the field of concrete, can solve the problems of high flexural strength, low strength, and high preparation cost, and achieve high compressive and flexural strength, strong impact resistance, and reduced cracking tendency Effect

Active Publication Date: 2022-07-12
TIANJIN CEMENT IND DESIGN & RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese Patent Publication No. CN109095860A discloses a new wear-resistant ceramic coating for the problem that the wear resistance of traditional wear-resistant ceramic coatings cannot be further improved, which uses high-alumina cement as a binder and corundum or silicon carbide as an aggregate , made by adding energy-saving materials, high-efficiency water reducer, steel fiber, wear-resistant ceramic coating with good workability and high flexural strength
[0006] The above-mentioned technical means for preparing wear-resistant materials mainly rely on the high wear resistance of ceramic aggregates such as corundum, silicon carbide, and high-alumina bauxite clinker. However, the price of ceramic aggregates is high, resulting in high preparation costs.
The cementitious materials used are mainly Portland cement or high-alumina cement already on the market, which only play a cementing role, resulting in insufficient wear resistance of the hardened slurry of the cementitious material
, Ordinary cementitious materials and material system design lead to low strength of the material, even in the case of using high-efficiency water reducer to reduce the water-binder ratio of the material system, the 28d strength of the material is also low, which can only reach 100-130MPa

Method used

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  • A kind of wear-resistant ultra-high performance concrete and preparation method thereof
  • A kind of wear-resistant ultra-high performance concrete and preparation method thereof
  • A kind of wear-resistant ultra-high performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Preparation of high-speed iron high-belite sulfoaluminate cement clinker powder

[0037] According to the raw meal weight ratio and batching rate value shown in Table 1, 1.0 ton of raw meal with a fineness of 0.08 mm and a sieve residue of less than 8% was obtained by grinding. 26% loss) of high-speed iron and high belite sulfoaluminate cement clinker, the specific surface area of ​​400 ~ 450m obtained after grinding 2 / kg of high-speed rail high-belite sulfoaluminate cement clinker powder.

[0038] Table 1 Raw meal ratio and ingredient ratio value

[0039]

[0040] The mineral composition of the high-speed iron high-belite sulfoaluminate cement clinker is shown in Table 2.

[0041] Table 2 Mineral composition of high-speed rail high-belite sulfoaluminate cement clinker

[0042]

[0043] According to the standard GB17671-1999 "Test method for strength of cement mortar (ISO method)", GB / T1346-2011 "Test method for water consumption, setting time and st...

Embodiment 2

[0048] Example 2 Preparation of special gelling material

[0049] According to the weight ratio shown in Table 4, each component is added to the dry powder mixer in turn, and the special cementitious material for wear-resistant UHPC is obtained after fully and uniformly mixing.

[0050] Table 4 Weight ratio of special cementitious materials

[0051]

[0052] According to the standard GB17671-1999 "Test method for strength of cement mortar (ISO method)" and GB / T1346-2011 "Test method for water consumption, setting time and stability of cement standard consistency", the physical properties of the above-mentioned groups of special cementitious materials The wear resistance of cement mortar was measured according to JC / T421-2004 "Test method for abrasion resistance of cement mortar", and the results are shown in Table 5.

[0053] Table 5 Physical properties of special cementitious materials

[0054]

[0055]

[0056] It can be seen from Table 5 that the flexural strengt...

Embodiment 3

[0057] Example 3 Preparation of wear-resistant UHPC material

[0058] In this embodiment, the SiO in the silica fume 2 The content is more than 95%, and the specific surface area is not less than 20000m 2 / kg. Steel slag aggregate is the solid waste slag-steel slag produced by the metallurgical industry, which is crushed and screened to make the particle size reach ≥1.0mm and ≤3.0mm; -Iron tailings, obtained by drying and sorting, so that the particle size is ≥0.5mm and ≤1.0mm; quartz sand is washed and dried sand with particle size ≤0.5mm; water reducing agent is polycarboxylate high-efficiency reducing agent Water agent, the water reduction rate is more than 30%; the length of the copper-plated steel fiber is 10mm-15mm, and the diameter is 0.15mm-0.2mm.

[0059] Group number 1:

[0060] Each raw material component was weighed according to the following weights: 650g special cementitious material; 150g silica fume; 620g steel slag aggregate; 350g iron tailing sand; 250g q...

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Abstract

The invention discloses a wear-resistant ultra-high performance concrete and a preparation method thereof, comprising the following raw materials in parts by weight: 600-650 parts of special cementitious materials; 120-150 parts of silica fume; 600-650 parts of steel slag aggregate; 300-350 parts of ore sand; 240-260 parts of quartz sand; 15-18 parts of water reducing agent; 80-100 parts of steel fiber; 160-180 parts of water. The special cementitious material is uniformly obtained by dry mixing the following raw materials by weight: 65-75 parts of Portland cement clinker powder; 20-30 parts of high-speed rail high-belite sulfoaluminate cement clinker powder; 5-10 parts of gypsum powder share. The invention has fast strength generation, high compressive and flexural strength, and strong impact resistance. The 1d compressive strength can reach 70MPa, the flexural strength can reach 15MPa, the 28d compressive strength can reach more than 180MPa, and the flexural strength can reach more than 35MPa; Value is less than 4.0cm 3 , the preparation cost is reduced by about 80%.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to a wear-resistant ultra-high performance concrete and a preparation method thereof. Background technique [0002] The problem of anti-abrasion has always been a difficult problem in the cement industry, and the downtime caused by abrasion accounts for 50% to 55% of the total downtime. In the cement industry, many equipment and pipelines are damaged prematurely by the erosion of materials or high-concentration dust-containing gas for a long time, and the service life is greatly reduced. How to improve the service life of these equipment and pipelines, improve the operating efficiency of the equipment and maintain the stable operation of the production system is of great significance for reducing production costs and saving energy. [0003] Effective protection of equipment and pipelines with wear-resistant materials is a reliable technical way to solve the problem of anti-abrasio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B11/30C04B18/14C04B18/12C04B111/20
CPCC04B28/14C04B11/30C04B18/142C04B18/12C04B2201/50C04B2111/20C04B2111/00017C04B7/02C04B7/32C04B18/146C04B14/06C04B2103/302C04B14/48Y02W30/91
Inventor 姚丕强黄雄
Owner TIANJIN CEMENT IND DESIGN & RES INST
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