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Special high-activity composite admixture for steam-cured concrete product

A technology for composite admixtures and concrete products, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of not being able to fully meet the needs of production and use, and the improvement effect of additives is not good enough to achieve unsatisfactory Easy to segregate and bleed, prevent excessive slump loss, and improve overall workability

Inactive Publication Date: 2016-01-06
浙江新业管桩有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improvement effect of additives in the existing technology is not good enough to fully meet the needs of production and use, because there is an urgent need for new high-activity composite admixtures (additives) for steam-cured concrete products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation of embodiment 1 steam-cured concrete products special high activity compound admixture:

[0019] The special high-activity composite admixture for steam-cured concrete products is prepared as follows:

[0020] (1) Raw materials are prepared in proportion: according to the mass ratio, the ratio of anhydrite: silicon micropowder: fly ash: ground slag micropowder is 0.35:0.30:0.30:1. (2) After the above micropowder is mixed evenly , for ball milling.

[0021] A uniform and delicate high-activity composite admixture for steam-cured concrete products is obtained.

Embodiment 2

[0023] Prepare the PHCAB type φ400×95mm pipe pile mixed with 25% of the special high-activity composite admixture for steam-cured concrete products in Example 1:

[0024] The formula is as follows:

[0025] Ordinary 52.5 grade cement 375Kg

[0026] Medium sand 675Kg

[0027] Gravel (5-25mm) 1175Kg

[0028] The special high-activity composite admixture 125Kg of the steam-cured concrete product that embodiment 1 obtains

[0029] Domestic water 140Kg

[0030] Water reducer 10Kg

[0031] The production method is as follows: put the raw materials in the above mixing ratio into the mixer, the mixing time is 150 seconds, and the measured slump is 48mm. After mixing, the mixing material is quickly poured into the pipe pile mold, and then centrifugal molding is carried out. The centrifugal molding time is respectively For: 120 seconds at low speed, 120 seconds at medium speed, 120 seconds at medium and high speed, and 450 seconds at high speed;

[0032] Conservation adopts one-ti...

Embodiment 3

[0038] Prepare the PHCAB type φ400×95mm pipe pile mixed with 30% of the special high-activity composite admixture for steam-cured concrete products in Example 1:

[0039] The formula is as follows:

[0040] Ordinary 52.5 grade cement 350Kg

[0041] Medium sand 640Kg

[0042] Gravel (5-25mm) 1210Kg

[0043] The special high-activity composite admixture 150Kg of the steam-cured concrete product that embodiment 1 obtains

[0044] Domestic water 140Kg

[0045] Water reducer 10Kg

[0046] The production method is as follows: put the raw materials in the above mixing ratio into the mixer, the mixing time is 150 seconds, and the measured slump is 46 mm. After mixing, the mixing material is quickly poured into the pipe pile mold, and then centrifugal molding is carried out. The centrifugal molding time is respectively For: 120 seconds at low speed, 120 seconds at medium speed, 120 seconds at medium and high speed, and 450 seconds at high speed;

[0047] Conservation adopts one-t...

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Abstract

The invention discloses a special high-activity composite admixture for a steam-cured concrete product. A preparation method of the special high-activity composite admixture comprises the following steps: raw materials are prepared according to the mass ratio of anhydrite to silica micro-powder to coal ash to pulverized slag powder being 0.35: 0.30:0.30:1; and the above raw materials are uniformly mixed, and the mixture undergoes ball-milling processing so as to obtain the special high-activity composite admixture. The micro-powder which accounts for 25-35% of a cementing material (materials of concrete) is added. The special high-activity composite admixture for a steam-cured concrete product helps to improve workability of high performance concrete of pipe piles. By adding the micro-powder, initial slump and fluidity of newly-stirred concrete slurry are enhanced and better than characteristics of calcium sulfate. The slurry can be plasticized to some extent, and cohesiveness of the concrete slurry is raised. The concrete is not easy for dissociation and bleeding when having high slump, and overall workability of concrete is improved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a special high-activity composite admixture additive for steam-cured concrete products. Background technique [0002] It has been more than 20 years since my country's first pipe pile production line was introduced in 1987. With the continuous progress of science and technology and production technology, the varieties and specifications of pipe piles produced have become more abundant. The types of pipe piles currently produced are: prestressed concrete pipe piles (PC piles), prestressed high-strength concrete pipe piles (PHC piles), etc. Prestressed high-strength concrete pipe piles are widely used for their good pile quality, high strength, driving resistance, strong penetration ability, strong adaptability to engineering geology, wide range of design options, easy pile deployment, economical and fast, and convenient testing. It is used as the foundation of industrial and civ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B14/06C04B18/08C04B18/14
CPCY02W30/91
Inventor 冯兴卓宋新初
Owner 浙江新业管桩有限公司