High Performance Dam Portland Cement

A Portland cement, high-performance technology, applied in the field of cement, can solve the problems of increasing the cost of cement and being unfavorable to environmental protection, and achieve the effects of saving energy, being beneficial to environmental protection, and controlling cracking

Inactive Publication Date: 2011-12-14
DANDONG HAIGONG CEMENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is not conducive to environmental protection, but also increases the cost of cement

Method used

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  • High Performance Dam Portland Cement
  • High Performance Dam Portland Cement

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Embodiment Construction

[0011] The present invention will be described in detail below in conjunction with examples.

[0012] The present invention is divided into 32.5 grades, 42.5 grades and 52.5 grades according to cement strength grades. The specific implementation schemes and performance indicators of these three grades are given below.

[0013] 1. The cement formulations (%) of the three grades are:

[0014] grade Clinker fly ash Mineral powder + desulfurization gypsum natural plaster grinding aid Level 32.5 26.4 16.0 54.1 3.0 0.5 Level 42.5 35.0 11.5 50.0 3.0 0.5 Level 52.5 44.0 7.5 45.0 3.0 0.5

[0015] The quality requirements of each raw material are:

[0016] 1. General Portland cement clinker

[0017]

[0018] 2. Fly ash is required to reach grade II or above, in which the loss on ignition is ≤7.5%, the 28d compressive strength activity index is ≥75%, and the specific surface area after grinding is ≥750 m 2 / kg;

[0019] 3....

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Abstract

The invention provides a high-performance Portland cement for dams, and the problem to be solved is: instead of using admixtures in medium-heat and low-heat Portland cements, all clinker is used. This is not conducive to environmental protection, but also increases the cost of cement. The gist of the present invention is that it is composed of pulverized general Portland cement clinker and mixed material after homogenization, wherein the mixed material accounts for 30-75% of the total weight of cement. The beneficial effect of the invention is that after the amount of the mixed material is increased, the performance of the cement is remarkably improved, especially the effect of reducing the heat of hydration is remarkable. After greatly increasing the amount of mixed materials, the proportion of clinker in cement is reduced, which is not only beneficial to environmental protection, but also reduces costs, and at the same time realizes the effective and recycling of industrial waste residues.

Description

technical field [0001] The invention relates to cement, in particular to cement used in water conservancy projects, tunnels, culverts, bridges and other large-volume concrete projects. Background technique [0002] At present, the cement used in water conservancy projects such as oceans, rivers, and reservoirs, as well as large-volume concrete projects such as tunnels, culverts, and bridges, is produced in accordance with GB200-2003 standards for medium-heat Portland cement, low-heat Portland cement and low-heat slag silicate. salt cement. This standard does not specify the amount of mixed materials for medium heat and low heat Portland cement, that is, no mixed materials are added, and only 20%~60% of granulated blast furnace slag is allowed to be mixed with low heat slag Portland cement (the percentage is Refers to the percentage of the material in the weight of the entire cement, the same below), and it is allowed to replace part of the granulated blast furnace slag with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 仇文革王磊于铁军张少明王海彦曲凤贤黄梅
Owner DANDONG HAIGONG CEMENT
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