Novel mixed alkaline cement based on alkali-activated cementing material and Portland cement and preparation method of novel mixed alkaline cement

A technology of portland cement and cementitious materials, which is applied in cement production and other directions, and can solve the problems of poor soft water erosion resistance, sulfate corrosion resistance and chloride ion penetration resistance, fast setting and hardening speed, and influence on popularization and application. , to achieve the effects of good chloride ion penetration resistance, improved carbonization resistance and less dosage

Inactive Publication Date: 2021-02-09
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cementitious material has some performance defects, such as poor carbonation resistance, large dry shrinkage, fast setting and hardening speed, etc., which affects its popularization and application in engineering practice.
Portland cement has the advantages of good carbonation resistance and small drying shrinkage, but its soft water erosion resistance, sulfate corrosion resistance and chloride ion penetration resistance are poor.

Method used

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  • Novel mixed alkaline cement based on alkali-activated cementing material and Portland cement and preparation method of novel mixed alkaline cement
  • Novel mixed alkaline cement based on alkali-activated cementing material and Portland cement and preparation method of novel mixed alkaline cement
  • Novel mixed alkaline cement based on alkali-activated cementing material and Portland cement and preparation method of novel mixed alkaline cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1. Effect of Portland Cement Addition on the Properties of New Mixed Alkaline Cement

[0022] According to the proportions in Table 1, weigh the granulated blast furnace slag, 42.5-grade Portland cement and NaOH solid particles, then put the three raw materials into the mixer and mix them evenly, and the obtained mixture is mixed alkaline cement; Water and sand are added to the obtained mixed alkaline cement, and the mixture is continuously stirred to obtain a mortar specimen.

[0023]

[0024] Mortar specimens with a size of 40mm×40mm×160mm formed from the proportions of groups 1 to 6 were placed in water at a temperature of (20±1)°C for 28 days, and then the flexural and compressive strengths of the specimens were measured. , the results are shown in Table 2, it can be seen that the strength of the mortar decreases after replacing part of the slag and NaOH in the slag cementitious material with the same amount of Portland cement, and the greater the amount ...

Embodiment 2

[0031] Example 2. Effect of NaOH addition on the strength of alkali-excited gelling materials

[0032] In order to understand the effect of NaOH content on the strength of alkali-induced cementitious materials, the mortar specimens with a size of 40mm × 40mm × 160mm were formed according to the proportions of each group in Table 3, and placed in water at a temperature of (20±1) ℃ for curing. After 28 days, the flexural and compressive strengths of the specimens were measured. The results are shown in Table 3.

[0033] Table 3 Proportion and strength value of alkali-excited cementitious material mortar

[0034]

[0035] It can be clearly seen from Table 3 that keeping the amount of slag and the water-binder ratio (water mass / (slag mass + NaOH mass)) unchanged, with the increase of NaOH content, the flexural and compressive strength of alkali-activated cementitious material mortar first gradually increases. When the NaOH content is 5%, the mortar strength reaches the maximum...

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Abstract

The invention discloses a novel mixed alkaline cement based on an alkali-activated cementing material and Portland cement and a preparation method thereof. The raw materials comprise granulated blastfurnace slag and alkali solid particles accounting for 2-10% of the mass of the granulated blast furnace slag, and also comprise Portland cement accounting for 5%-15% of the total mass of the granulated blast furnace slag and the alkali solid particles. The novel mixed alkaline cement disclosed by the invention has good comprehensive properties, such as good carbonization resistance, chloride ionpenetration resistance and sulfate corrosion resistance, relatively small air shrinkage, no obvious reduction in strength and the like.

Description

technical field [0001] The invention belongs to the field of novel cementitious materials, in particular to a novel mixed alkaline cement based on an alkali-excited cementitious material and Portland cement. Background technique [0002] Alkali-activated cementitious material is an important hydraulic cementitious material, which has been paid more and more attention by people, and its application has become more and more extensive. Compared with Portland cement, it is a relatively environmentally friendly cement. It not only uses industrial waste such as fly ash and slag, but also does not emit waste gas and dust during production and use. In addition, this cementitious material also has some excellent properties that Portland cement does not have, such as good sulfate resistance, chloride ion penetration resistance, and soft water erosion resistance. However, the cementitious material has some performance defects, such as poor carbonization resistance, large drying shrink...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/19C04B7/153C04B7/36
CPCC04B7/19C04B7/1535C04B7/36Y02P40/10
Inventor 周万良任永祺郭文涛谭剑冬张迁禧刘亦恒
Owner HEFEI UNIV OF TECH
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