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High-performance cement expansive agent and production method thereof

A high-performance concrete and production method technology, applied in the field of concrete expansion agent, can solve problems such as cracking and deterioration, achieve reasonable particle gradation, reduce early shrinkage, and have good anti-crack and anti-seepage effects

Inactive Publication Date: 2009-09-23
浙江合力海科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ordinary concrete often leads to cracking and deterioration due to dry shrinkage and cold shrinkage

Method used

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  • High-performance cement expansive agent and production method thereof
  • High-performance cement expansive agent and production method thereof
  • High-performance cement expansive agent and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] Embodiment: the prescription of high-performance concrete expansive agent and its production

[0036] The formula is as follows:

[0037] raw material name

Content (weight%)

t / h

Anhydrite

40

10.40

Desulfurization gypsum

25

6.50

Calcium aluminate clinker

23

5.98

Alum mud

9

2.34

polyglycol ether

3

0.78

total

100

26.00

[0038] Put the blocky calcium aluminate clinker into the vertical mill to dry and grind to 1g0-220m 2 / Kg, enter the special warehouse, and then anhydrite, desulfurized gypsum, calcium aluminate clinker, and alum mud are electronically weighed according to the formula and weighed 25.22t / h, then enter the ball mill, and grind until the specific surface area is 400-500m 2 / Kg, at the same time, the polyethanol ether is atomized at 0.78t / h by special spray equipment and sprayed into the ball mill.

[0039] Product perfor...

example 1

[0064] Example 1: Application of high-performance concrete expansion agent in basement C35 and C40 impermeable concrete in the building of Weike Central Business District in Cixi City.

[0065] Concrete Design Requirements:

[0066] (1) The design concrete grade of the bottom plate is C35, the impermeability grade is P10, and the limited expansion rate of the concrete is 14d≥0.015% in water.

[0067] (2) The design concrete grade of the side wall is C40, the impermeability grade is P10, and the limited expansion rate of the concrete is 14d ≥ 0.020% in water.

[0068] See the table for specific data

[0069] Table 9 Floor and side wall concrete mix ratio

[0070]

[0071]

[0072] Table 10 concrete performance index

[0073]

[0074] The above data all meet the design requirements.

example 2

[0075] Example 2: The application of high-performance concrete expansion agent in the basement floor, side wall and post-pouring belt of Shangcheng by Linhai Lake.

[0076] Concrete Design Requirements:

[0077] (1) The design concrete grade of the bottom plate is C35, and the limited expansion rate of the concrete in water for 14 days is ≥0.015%.

[0078] (2) The design concrete grade of the side wall is C40, and the limited expansion rate of the concrete after 14 days in water is ≥0.020%.

[0079] (3) The design concrete grade of the post-pouring belt is C40, and the limited expansion rate of the concrete in water for 14 days is ≥0.025%.

[0080] Table 11 Concrete mix ratio for floors, side walls, and post-cast strips

[0081]

[0082] Table 12 concrete performance index

[0083]

[0084] The above data all meet the design requirements.

[0085] The invention realizes reasonable grading of particles by making full use of the difference in grindability of different ...

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Abstract

The invention relates to a high-performance cement expansive agent and a production method thereof. Aluminate expansive chamotte calcined at high temperature in a rotary kiln, other aluminum chamotte, anhydrite, desulfurized gypsum and polyalcohol ether (a reducing component) are mixed together according to a certain proportion to form the high-performance cement expansive agent. The production method comprises the following steps: firstly adding the blocky aluminate expansive chamotte into a vertical mill so as to pulverize the chamotte to a certain specific surface area; then adding the anhydrite, the desulfurized gypsum and the other aluminum chamotte together into a ball mill so as to pulverize the mixture to a certain specific surface area; and during the pulverizing in the ball mill, spraying the reducing component into the ball mill after atomizing the reducing component through a special device so as to evenly mix the components and obtain the finished product. Through the full use of the difference between the grinding performances of different mineral materials, the method compounds the recipe and carries out the process parameter control so as to realize the reasonable gradation of the particles. The high-performance cement expansive agent can reduce or avoid the problems that: a concrete structure produces harmful cracks due to early contraction, dry shrinkage and cold shrinkage, thereby bringing about structural leakage. The high-performance cement expansive agent can be used for continuous production, and has high compensation and contracting performance and convenient use.

Description

technical field [0001] The invention relates to a concrete admixture specially used for shrinkage-compensating concrete and durable high-performance concrete, in particular to a concrete expansion agent. technical background [0002] Ordinary concrete often leads to cracking and deterioration due to dry shrinkage and cold shrinkage. People hope to have such a kind of cement, which can produce a certain amount of expansion when setting and hardening, to offset its shrinkage, thereby eliminating various disadvantages caused by concrete shrinkage. From another perspective, people explore whether the expansion produced by cement hydration can be used to stretch the steel bars to achieve the purpose of mechanical prestressing. After years of hard work, expansive concrete has become an independent discipline. Thus, concrete expansive agent came into being. [0003] The research and development of expansion agents in my country has a history of about 30 years. At the beginning o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B22/14
CPCC04B7/323C04B22/008
Inventor 丁小富程占莲
Owner 浙江合力海科新材料股份有限公司
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