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Special cementing material for preparing wear-resistant ultra-high performance concrete

A cementitious material and ultra-high-performance technology, applied in the field of concrete, can solve the problems of low strength, high flexural strength, low strength, etc., and achieve the effect of promoting strong bonding, improving bonding performance, and improving wear resistance.

Active Publication Date: 2021-08-31
TIANJIN CEMENT IND DESIGN & RES INST
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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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  • Special cementing material for preparing wear-resistant ultra-high performance concrete
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  • Special cementing material for preparing wear-resistant ultra-high performance concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 Preparation of high-iron high-belite sulphoaluminate cement clinker powder

[0024] According to the raw meal weight ratio and batching rate value shown in Table 1, grinding to obtain 1.0 tons of raw meal with a fineness of 0.08mm and a sieve residue of less than 8%, after calcining at 1310°C in a rotary kiln, 0.74 tons (raw meal burned Loss of 26%) high iron high belite sulfoaluminate cement clinker, after grinding to obtain a specific surface area of ​​400 ~ 450m 2 / kg of high iron high belite sulphoaluminate cement clinker powder.

[0025] Table 1 Raw meal ratio and ingredient rate value

[0026]

[0027] The mineral composition of high-iron high-belite sulfoaluminate cement clinker is shown in Table 2.

[0028] Table 2 Mineral composition of high-iron high-belite sulfoaluminate cement clinker

[0029]

[0030] According to the standard GB17671-1999 "Cement mortar strength test method (ISO method)", GB / T1346-2011 "Cement standard consistency wat...

Embodiment 2

[0035]The preparation of embodiment 2 special gelling materials

[0036] According to the weight ratio shown in Table 4, each component was added into the dry powder mixer in sequence, and the wear-resistant UHPC special gel material was obtained through thorough and uniform mixing.

[0037] The weight proportion of table 4 special cementitious material

[0038]

[0039] According to the standard GB17671-1999 "Cement Mortar Strength Test Method (ISO Method)", GB / T1346-2011 "Cement Standard Consistency Water Consumption, Setting Time, Stability Test Method", the physical properties of the above-mentioned groups of special cementitious materials The measurement was carried out according to JC / T421-2004 "Test Method for Abrasion Resistance of Cement Mortar", and the results are shown in Table 5.

[0040] Table 5 Physical properties of special cementitious materials

[0041]

[0042]

[0043] It can be seen from Table 5 that the special cementitious material composed of...

Embodiment 3

[0044] Embodiment 3 Preparation of wear-resistant UHPC material

[0045] In this embodiment, SiO in silica fume 2 The content is greater 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 in the metallurgical industry, which is crushed and screened to make its particle size ≥1.0mm and ≤3.0mm; iron tailings sand is the mineral processing tailings produced in iron ore beneficiation -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 a particle size of ≤0.5mm; Water agent, the water reducing rate is greater than 30%; the length of the copper-plated steel fiber is 10mm-15mm, and the diameter is 0.15mm-0.2mm.

[0046] Group number 1:

[0047] Weigh each raw material component according to the following weight: 650g of special cementitious material; 150g of silica fume; 620g of steel slag aggregate; 350g of iro...

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Abstract

The invention discloses a special cementing material for preparing wear-resistant ultra-high performance concrete. The special cementing material is prepared by uniformly dry-mixing the following raw materials in parts by weight: 65-75 parts of Portland cement clinker powder, 20-30 parts of high-iron and high-belite sulphoaluminate cement clinker powder, and 5-10 parts of gypsum powder. The proportioning parameters of the high-iron and high-belite sulphoaluminate cement clinker comprises the alkalinity coefficient Cm value is 1.2-1.4, the fCaO is 3-5%, and the fSO3 is 2-3%; and the mineral comprises 45-50% of C2S mineral, 20-26% of mineral, 20-25% of C4AF mineral, 3-5% of CaSO4 mineral, and 2-4% of fCaO mineral. The wear resistance of the special cementing material is remarkably improved by 40% compared with that of Portland cement, and reliable technical support is provided for improving the wear resistance of the wear-resistant UHPC material.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a special cementitious material for preparing wear-resistant ultra-high performance concrete. Background technique [0002] The problem of anti-abrasion has always been a difficult problem in the cement industry, and the downtime caused by wear 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 equipment and maintain the stable operation of the production system is of great significance for reducing production costs and saving energy. [0003] Using wear-resistant materials to effectively protect equipment and pipelines is a reliable technical way to solve the problem ...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/04
CPCC04B7/323C04B7/04Y02W30/91
Inventor 姚丕强黄雄
Owner TIANJIN CEMENT IND DESIGN & RES INST
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