Cement clinker, cement composition, and cement clinker production method

A technology for cement clinker and quality, applied in cement production, solid waste management, sustainable waste treatment, etc., can solve the problems of high hydration heat, increased A amount, and limited usage, and achieve the effect of low hydration heat

Active Publication Date: 2022-02-01
SUMITOMO OSAKA CEMENT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if these wastes and by-products are used, C in the mineral composition of cement clinker 3 The amount of A increases, resulting in a higher heat of hydration
Currently, when using the above-mentioned waste and by-products as raw materials for cement clinker, the amount of use is limited

Method used

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  • Cement clinker, cement composition, and cement clinker production method
  • Cement clinker, cement composition, and cement clinker production method

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Embodiment

[0110] Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited in any way by the following examples.

[0111] 1. Measurement and evaluation

[0112] 1-1. Composition of clinker

[0113] The chemical composition (content rate of each component) in the cement clinker of Examples and Comparative Examples is based on JIS R5204: 2019 "Fluorescent X-ray Analysis Method for Cement" and JCAS I-53: 2018 "Quantitative Method for Trace Components in Cement" Determination. Mineral composition according to obtained CaO, SiO 2 、Al 2 o 3 and Fe 2 o 3 The mass ratio of is calculated using the following Bouger's formula. The results are shown in Table 1.

[0114] C 3 S=(4.07×CaO)-(7.60×SiO 2 )-(6.72×Al 2 o 3 )-(1.43×Fe 2 o 3 )

[0115] C 2 S=(2.87×SiO 2 )-(0.754×C 3 S)

[0116] C 3 A=(2.65×Al 2 o 3 )-(1.69×Fe 2 o 3 )

[0117] C 4 AF=3.04×Fe 2 o 3

[0118] In addition, the value o...

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Abstract

Provided are a cement clinker and a cement composition which can be reduced in heat of hydration and are excellent in short term strength development. A cement clinker in which the proportion of C3S determined by Bogue calculation is 50-75% by mass, the proportion of C2S determined by Bogue calculation is 5-25% by mass, and the total proportion of C3A and C4AF determined by Bogue calculation is 15-22% by mass, and which contains MgO, TiO2, MnO and ZnO, and satisfies the following formula (1). (1): CMg-C3AxCTi-C3AxCMn-C3AxCZn-C3A<=0.0010 (in the formula (1), CMg-C3A represents the MgO content (% by mass) in C3A, CTi-C3A represents the TiO2 content (% by mass) in C3A, CMn-C3A represents the MnO content (% by mass) in C3A, and CZn-C3A represents the ZnO content (% by mass) in C3A).

Description

technical field [0001] The invention relates to a cement clinker and a cement composition, in particular to a common Portland cement. Background technique [0002] From the viewpoint of suppressing concrete cracks, cement compositions with low heat of hydration are required. For example, according to "General Specifications for Civil Engineering (Revised in April 2019)" (Kanto Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism), Part 2 "Materials", Section 6 "Cement and Mixed Materials", 2-2-6- 2 "Cement", Table 2-2-18 "Mass of Ordinary Portland Cement", the heat of hydration of cement shows that it is 350 J / g or less at 7 days old and 400 J at 28 days old / g below the administrative target value. [0003] In recent years, various wastes and by-products containing a large amount of Al, such as coal ash and construction soil, have been used as cement raw materials. However, if these wastes and by-products are used, C in the mineral composi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/06C04B7/04C04B7/21C04B7/36C04B7/44
CPCC04B7/24C04B7/06C04B7/04C04B7/21C04B7/36C04B7/44C04B7/02
Inventor 清水准山田曜山县亨介佐藤友树那须英由希
Owner SUMITOMO OSAKA CEMENT CO LTD
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