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Preparation method of wear-resistant cement suitable for roads and bridges

A bridge and wear-resistant technology, applied in cement production and other directions, can solve the problems of steel slag being difficult to effectively dispose of, unable to be used as iron raw materials, low dry shrinkage rate and wear resistance, etc., to improve burnability, avoid shrinkage cracks, Post-intensity effect

Inactive Publication Date: 2021-11-30
阳新娲石水泥有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At the same time, it is difficult to effectively dispose of a large amount of steel slag produced by large iron and steel plants. With the strict control of water-soluble chromium content in cement, steel slag cannot be used as an iron raw material for raw meal ingredients due to its high total chromium content (raw meal passed through After high-temperature calcination, trivalent chromium is oxidized to hexavalent chromium), and a large amount of waste steel slag is piled up to cause waste of land resources and environmental pollution, which urgently needs to be effectively utilized
[0006] The present invention aims to develop a kind of cement suitable for roads and bridges. Solid waste such as steel slag is comprehensively utilized in the research and development of the cement, which not only meets the railway concrete standard, but also helps to improve the durability of cement concrete, and has a small dry shrinkage rate. , good wear resistance and other characteristics, effectively solve the problem of single function of the current cement products

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The invention provides a preparation method of wear-resistant cement suitable for roads and bridges, comprising the following steps:

[0026] Selecting calcium raw materials, aluminum silicon raw materials, and iron raw materials are respectively 84.0%, 10.5%, and 6.5% according to mass percentages, and the dosage of raw meal additives is 0.3%; the calcium raw materials, silicon aluminum raw materials and The iron raw materials are grinded and dried respectively to obtain raw meal fine powder with an average particle size of 28 μm and 80 μm, and 14% of the sieved residue. After the raw meal fine powder is mixed evenly, add appropriate amount of water and stir to make raw meal balls with a diameter of 12 mm. After drying, it is fired at a high temperature of 1450°C. The holding time at the firing temperature is 1.5 hours. After the high-temperature calcination, it is immediately cooled to room temperature with strong cold air to obtain the required Portland cement clinker...

Embodiment 2

[0030] Select calcium raw materials, aluminum-silicon raw materials, and iron raw materials to be 78.0%, 13%, and 9% respectively according to mass percentages, and the dosage of raw material additives is 0.3%; the calcium raw materials, silicon-aluminum raw materials and After the iron raw materials are ground and dried, the raw meal fine powder with an average particle size of 15 μm and 80 μm sieved with 16% is obtained. After the raw meal fine powder is mixed evenly, add appropriate amount of water and stir to make raw meal balls with a diameter of 10 mm. After drying, it is fired at a high temperature of 1450°C. The holding time at the firing temperature is 1 hour. After the high-temperature calcination is completed, it is immediately cooled to room temperature with strong cold air to obtain the required Portland cement clinker. The Portland cement clinker is: alkali equivalent ≤ 0.6%, free calcium oxide ≤ 0.8%, C3A content ≤ 7.0%, C4AF content ≥ 12.0%, MgO content ≤ 3.5%, ...

Embodiment 3

[0034] Select calcium raw materials, aluminum silicon raw materials, and iron raw materials to be 79%, 13%, and 8% respectively according to mass percentages, and the dosage of raw material additives is 0.3%; the calcium raw materials, silicon aluminum raw materials and After the iron raw materials are ground and dried, the raw meal fine powder with an average particle size of 25 μm and 80 μm sieved with 14% is obtained. After the raw meal fine powder is mixed evenly, add appropriate amount of water and stir to make raw meal balls with a diameter of 10 mm. After drying, it is fired at a high temperature of 1450°C, and the holding time at the firing temperature is 0.5 hours. After the high-temperature calcination, it is immediately cooled to room temperature with strong cold air to obtain the required Portland cement clinker. The Portland cement clinker is: alkali equivalent ≤ 0.6%, free calcium oxide ≤ 0.8%, C3A content ≤ 7.0%, C4AF content ≥ 12.0%, MgO content ≤ 3.5%, 3-day co...

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Abstract

The invention discloses a preparation method of wear-resistant cement suitable for roads and bridges, and relates to the technical field of building materials. The preparation method of the wear-resistant cement suitable for roads and bridges comprises the following components by mass: 75%-85% of Portland cement clinker, 0.02%-0.05% of an enhanced grinding aid, 5%-15% of superfine slag powder, 3%-8% of steel slag powder, 3%-6% of dihydrate gypsum, and 0.3%-1.0% of steel fiber. The invention aims to develop the cement suitable for roads and bridges, solid wastes such as steel slag are comprehensively utilized in the development and preparation of the cement, the cement not only meets the railway concrete standard and is beneficial to improving the durability of cement concrete, but also has the characteristics of small dry shrinkage rate, good wear resistance and the like, and the problem of single function of the current cement product is effectively solved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of wear-resistant cement suitable for roads and bridges. Background technique [0002] Since the beginning of the 21st century, with the increase in investment and emphasis on infrastructure construction in our country, the rapid development of transportation construction, the total mileage of national highways and railways has continued to increase. In 2019, the total mileage of national highways exceeded 5 million kilometers, of which the mileage of rural roads reached 4.2005 million kilometers. The construction of expressways showed a steady growth trend. As of the end of 2020, the national railway operating mileage was 146,300 kilometers, including 37,900 kilometers of high-speed rail. During the period from 2021 to 2025, the country will continue to improve the construction of the road network, improve the layout of the road network, and impl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/147C04B7/36C04B7/42C04B7/48
CPCC04B7/147C04B7/36C04B7/428C04B7/48Y02P40/10
Inventor 胡龙明郭文叶俊王林海
Owner 阳新娲石水泥有限公司
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