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Low-carbon high-performance concrete supplementary cementitious material

A technology of auxiliary cementitious materials and high-performance concrete, which is applied in the field of low-carbon high-performance concrete auxiliary cementitious materials, can solve the problems of lack of means to control the water-binder ratio, reduced compressive and flexural properties, and early strength decline. Good energy saving and emission reduction benefits, inhibition of AAR reaction, and improvement of durability indicators

Active Publication Date: 2013-03-20
宁夏新丰益节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] As far as the existing technology is concerned, the so-called improved high-durability concrete technology has not been widely used. The reason is that there is no means for controlling the water-binder ratio, which makes it difficult for many "high-durability concrete" to truly reflect the purpose of the invention. The performance pursued makes the strength and durability of concrete unguaranteed
This involves technologies such as the adaptability of admixtures, the micro-aggregate gradation of cementitious materials, and the state of sand and gravel aggregates as the control standard. Insufficient performance, especially when the addition amount is large, the early strength of cement and its products will drop sharply, resulting in prolonged setting time, and at the same time, the compressive and flexural properties will be reduced

Method used

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Embodiment Construction

[0017] The present invention is further described below.

[0018] Prepared in parts by weight, the admixture is composed of 20-70 parts of slag powder, 20-70 parts of fly ash, 5-10 parts of silica fume, 3-10 parts of desulfurized gypsum, and 1-3 parts of water reducing agent; among them, Slag powder, fly ash, silica fume, and desulfurized gypsum are micro-aggregates with a particle size of 100 nanometers to 100 microns, and the materials are placed in the mixer in sequence, at normal temperature and pressure, at 60-120 rpm Stir at a high speed for 60-120 minutes to obtain auxiliary gelling material.

[0019] In the above, silica fume is nano-scale, and its active component is mainly SiO 2 , which is formed by the reduction reaction of high-purity quartz and coke in the electric arc furnace during smelting through chemical and physical modification, forming a nano-scale active mineral component with an average particle size of 0.1-0.2um. Nano-scale silica fume is 1 / 100-1 / 50 o...

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PUM

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Abstract

The invention discloses a low-carbon high-performance concrete supplementary cementitious material which is prepared from 20-70 parts of slag, 20-70 parts of coal ash, 5-10 parts of silica fume, 3-10 parts of desulfurized gypsum and 1-3 parts of water reducing agent by weight to form an admixture, wherein the slag, the coal ash, the silica fume and the desulfurized gypsum are micro aggregates of 100 nanometers to 100 microns; and the materials are sequentially placed in a mixer and stirred for 60-120 minutes at a speed of 60-120 rpm at normal temperature under normal pressure to obtain the supplementary cementitious material. The low-carbon high-performance concrete supplementary cementitious material disclosed by the invention can replace 70% of cement in concrete when applied to concrete; and even if the 70% of cement is replaced, the strength of the prepared concrete also can reach C15-C60. The low-carbon high-performance concrete supplementary cementitious material is suitable to be used as a building material and also has special purposes of back-fill grouting, toxic waste solidification and the like.

Description

technical field [0001] The invention relates to the international patent classification C04B construction concrete material technology, especially low-carbon high-performance concrete auxiliary cementitious material. Background technique [0002] In the prior art, concrete is composed of aggregate, cement stone structure and aggregate and cement stone interface transition zone. The latter two phases belong to microstructure. According to the relationship between microstructure and performance, cement stone, cement stone and aggregate interface The improvement of the two microstructures in the transition zone is the key to determine the performance of concrete. [0003] The cement stone formed after Portland cement hydration is mainly composed of hydration products calcium silicate hydrate [CSH], calcium hydroxide, unhydrated cement particle core, calcium aluminate hydrate, calcium ferrite hydrate, calcium Composition of alumite, etc. Most of the hydration products are clus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
Inventor 袁芬贾佳张超黄志斌
Owner 宁夏新丰益节能科技有限公司
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