Seed crystal type early strength agent and preparation method thereof

A technology of accelerator and seed crystal, which is applied in the field of seed crystal accelerator and its preparation, can solve the problems of poor low-temperature early-strength effect, limited material source, high durability risk, etc., and realize waste utilization, process Simple, low-equipment-required effect

Active Publication Date: 2019-12-13
SOUTH CHINA UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of existing accelerators such as high durability risk, poor low-temperature early-strength effect, high cost and limited material sources, the present invention provides a seed-type early-strength agent and a preparation method thereof; The seed crystal type early strength agent has the advantages of simple preparation process, low production cost, small durability risk, and can function normally under low temperature conditions. The seed crystal type early strength agent provided by the invention is especially suitable for improving the working performance of fresh concrete Production of undemanding concrete precast elements

Method used

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  • Seed crystal type early strength agent and preparation method thereof
  • Seed crystal type early strength agent and preparation method thereof
  • Seed crystal type early strength agent and preparation method thereof

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Effect test

Embodiment 1

[0037] Embodiment 1 provides a kind of seed crystal type early strength agent, as shown in table 3 (table 3 is the preparation formula and parameter information table of each embodiment seed crystal type early strength agent), the dispersant described in table 3 is Powder polycarboxylate water-reducer (the dispersants used in Examples 1-5 are all powder polycarboxylate water-reducers), raw materials in parts by weight, including: 5 parts of pre-hydrated cement particles, 5 parts of dispersed agent, 90 parts deionized water.

[0038] The prehydration cement particles used, and its preparation method, include the following steps: uniformly stirring deionized water and cement to obtain cement slurry, performing curing treatment on the cement slurry, grinding after crushing, and sieving to obtain the prehydration cement particle. For cement particles, the mesh of the sieve is a square sieve, and the mesh size (side length) of the sieve is 75 μm. Wherein, the water-cement ratio of...

Embodiment 2

[0044] Embodiment 2 provides a kind of seed type early strengthening agent, and proportioning ratio is as shown in table 3, and the dispersant described in table 3 is powder polycarboxylate superplasticizer (the dispersant used in embodiment 1-5 is powder Body polycarboxylate superplasticizer), raw materials by weight, including: 9 parts of pre-hydrated cement particles, 11 parts of dispersant, 80 parts of deionized water.

[0045] The prehydration cement particles used, and its preparation method, include the following steps: uniformly stirring deionized water and cement to obtain cement slurry, performing curing treatment on the cement slurry, grinding after crushing, and sieving to obtain the prehydration cement particle. For cement particles, the mesh of the sieve is a square sieve, and the mesh size (side length) of the sieve is 75 μm. Wherein, the water-cement ratio of deionized water and cement is 0.4; the temperature of the curing treatment is 20 degrees Celsius, and t...

Embodiment 3

[0051] Embodiment 3 provides a kind of seed crystal type early strengthening agent, proportioning as shown in table 3, and the dispersant described in table 3 is powder polycarboxylate superplasticizer (the dispersant used in embodiment 1-5 is powder Body polycarboxylate superplasticizer), raw materials by weight, including: 7 parts of pre-hydrated cement particles, 8 parts of dispersant, 85 parts of deionized water.

[0052]The prehydration cement particles used, and its preparation method, include the following steps: uniformly stirring deionized water and cement to obtain cement slurry, performing curing treatment on the cement slurry, grinding after crushing, and sieving to obtain the prehydration cement particle. For cement particles, the mesh of the sieve is a square sieve, and the mesh size (side length) of the sieve is 75 μm. Wherein, the water-cement ratio of deionized water and cement is 0.70; the temperature of the curing treatment is 30 degrees Celsius, and the cur...

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Abstract

The invention discloses a seed crystal type early strength agent and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing a dispersing agent with waterto obtain a suspension, and then adding pre-hydrated cement particles into the suspension to obtain slurry; and grinding the slurry to obtain a suspension which is the seed crystal type early strengthagent. The seed crystal type early strength agent provided by the invention has effects of early strength and water reduction, and does not contain components which may accelerate steel bar corrosionand alkali aggregate reaction and damage the later strength of concrete. The preparation method provided by the invention has the advantages of simple process, easiness in obtaining of required raw materials, low equipment requirement, low cost, capability of facilitating large-scale popularization and the like.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a seed crystal type early strength agent and a preparation method thereof. Background technique [0002] In response to the national call for energy conservation and emission reduction, a large number of auxiliary cementitious materials are used in construction projects today, which makes the early strength of concrete develop slowly, and also affects the progress of the project. In particular, with the rapid development of prefabricated buildings, problems such as low mold turnover rate due to the slow development of early strength of concrete prefabricated parts in low temperature environments will gradually be exposed, seriously affecting production efficiency and increasing production costs. In addition, in some special projects, such as cementing projects, the slow development of early strength of cementing materials will directly affect the drilling progress a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/02C04B103/12
CPCC04B40/0039C04B2103/12C04B7/02C04B2103/302
Inventor 殷素红林荣永詹国良林东刘冠升叶门康
Owner SOUTH CHINA UNIV OF TECH
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