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Minimum inflation low heat silicate cement

A portland cement and micro-expansion technology, applied in cement production, sustainable waste treatment, solid waste management, etc., can solve the problems of high heat of hydration, easy cracking, etc., achieve long-term strength stability, low water demand, and later The effect of high strength increase rate

Active Publication Date: 2011-09-07
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a micro-expansion low-heat Portland cement with low heat and micro-expansion, simple process, stable expansion performance, energy saving and emission reduction, and low cost, which can not only overcome the high heat of hydration and easy The problem of cracking is also conducive to environmental protection and resource recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Calcinate the magnesite at 800°C for 60 minutes, and after natural cooling, grind it through a 0.125 μm sieve, and grind the steel slag to a specific surface area of ​​300m 2 / kg, according to the following ratio:

[0034] Low heat portland cement clinker 85%

[0035] Gypsum 5%

[0036] Lightly burnt MgO 2%

[0037] Steel slag 6%

[0038] Grind after mixing, so that the fineness is less than 12%, and it is prepared into micro-expansion low-heat Portland cement. The chemical composition and mineral composition of the prepared micro-expansion low-heat Portland cement are shown in Table 1.

[0039]

[0040]

Embodiment 2

[0042] Calcinate the magnesite at 850°C for 60 minutes, and after natural cooling, grind it through a 0.125 μm sieve, and grind the steel slag to a specific surface area of ​​390m 2 / kg, according to the proportion of low-heat Portland cement clinker 85%, gypsum 5%, light-burned MgO2%, steel slag 6%. Grind after mixing, so that the fineness is less than 12%, and it is prepared into micro-expansion low-heat Portland cement.

Embodiment 3

[0044] Calcinate the magnesite at 950°C for 60min, cool it naturally and grind it through a 0.125μm sieve, and grind the steel slag to a specific surface area of ​​420m 2 / kg, according to the following ratio:

[0045] Low heat portland cement clinker 85%

[0046] Gypsum 5%

[0047] Lightly burnt MgO 2%

[0048] Steel slag 6%

[0049] Grind after mixing, so that the fineness is less than 12%, and it is prepared into micro-expansion low-heat Portland cement.

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Abstract

The invention discloses minimum inflation low heat silicate cement. The cement comprises the following components in percentage by weight: 75 to 95 percent of low heat silicate clinker, 1 to 10 percent of gypsum, 0.01 to 6 percent of lightly-burnt MgO, and 5 to 15 percent of steel slag. The minimum inflation low heat silicate cement can effectively reduce early concrete plastic cracking and temperature stress cracking generated by later hydrating adiabatic temperature rise, caused by adverse construction and maintenance conditions when the concrete is constructed. The prepared concrete has the advantages of high flowing performance, small dry shrinkage, little temperature contraction joint and the like, and can be applied in the fields of mass concrete, hydraulic concrete, high performance concrete engineering and the like which have high requirement on anti-cracking performance.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to micro-expansion low-heat portland cement. Background technique [0002] The current general-purpose Portland cement series evolved from the Portland cement invented in 1824. It is made of limestone, clay and other raw materials, designed with appropriate rate and composition, and processed through the "two grinding and one burning" process. Currently the largest hydraulic cementitious material. In the past 200 years, the chemical composition and mineral composition of Portland cement have basically remained unchanged, and the technological progress of the cement industry is mainly reflected in the production process. [0003] For a long time, Portland cement has been widely used due to its stable performance and mature production technology. However, in the hydration process of mass concrete and hydraulic concrete, the heat of hydration and water demand are relatively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B7/00C04B28/04Y02P40/10Y02W30/91C04B7/28C04B18/142C04B22/062C04B22/143
Inventor 许毅刚吴勇阳运霞王田堂陈东
Owner JIAHUA SPECIAL CEMENT
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