self-compacting concrete

A self-compacting concrete and retarder technology, which is applied in the field of building materials, can solve the problems of dry shrinkage, low strength, and honeycomb pockmarks, etc., and achieve the effects of reducing dosage, improving surface compactness, high flatness and gloss

Active Publication Date: 2017-11-03
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of honeycomb pitting, low strength and drying shrinkage in the production of high-quality prefabricated components in the self-compacting concrete prepared by using polycarboxylate high-efficiency water reducer in sulphoaluminate cement. , a kind of self-compacting concrete is proposed, through the raw material selection of sulfate cement, admixture and coarse and fine aggregate, and the specific raw material ratio design, the surface finish and strength of high-quality prefabricated components can be improved, and the application range of self-compacting concrete can be expanded. Purpose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A self-compacting concrete containing the following weights of raw materials per cubic meter of concrete, as shown in the table below:

[0034]

[0035] Explanation: T500 is used to test the segregation resistance, stability and relative viscosity of cement, and the J ring test is used to test the passing ability and anti-blocking ability of cement.

[0036] In the present embodiment, the specific surface area of ​​sulfoaluminate cement is 358m 2 / kg, 80μm square hole sieve remaining 8%; initial setting time 30min, final setting time 45min; water demand 128ml; 3d flexural strength 7.0MPa, compressive strength 42.8MPa, 28d flexural strength 7.6MPa, compressive strength 51MPa .

[0037] In this example, the polycarboxylate superplasticizer has a solid content of 28% and a water reducing rate of 29%. After the polycarboxylate superplasticizer is added, the air content of the concrete is 4.5%.

[0038] In the present embodiment, the mud content of the sand in the washi...

Embodiment 2

[0044] A self-compacting concrete containing the following weights of raw materials per cubic meter of concrete, as shown in the table below:

[0045]

[0046] In this embodiment, the setting retarder is sodium citrate.

[0047] In this embodiment, the specific surface area of ​​sulphoaluminate cement is 375m 2 / kg, 80μm square hole sieve remaining 6%; initial setting time 28min, final setting time 40min; water demand 140ml; 3d flexural strength 7.8MPa, compressive strength 46MPa, 28d flexural strength 8.2MPa, compressive strength 53MPa.

[0048] In this example, the polycarboxylate superplasticizer has a solid content of 30% and a water reducing rate of 27%. After the polycarboxylate superplasticizer is added, the air content of the concrete is 6.5%.

[0049] In this embodiment, the mud content of the sand in the water washing is 0.4%, the fineness modulus is 2.97, and the gradation distribution: the remainder of the 4.75mm standard sieve accounts for 5%, the remainder of...

Embodiment 3

[0055] A self-compacting concrete containing the following weights of raw materials per cubic meter of concrete, as shown in the table below:

[0056]

[0057] In this embodiment, the retarder is sucrose.

[0058] In this embodiment, the specific surface area of ​​sulphoaluminate cement is 365m 2 / kg, 80μm square hole sieve residue 6.5%; initial setting time 30min, final setting time 41min; water demand 130ml; 3d flexural strength 7.7MPa, compressive strength 44MPa, 28d flexural strength 8.0MPa, compressive strength 53MPa.

[0059] In this example, the polycarboxylate superplasticizer has a solid content of 30% and a water reducing rate of 27%. After the polycarboxylate superplasticizer is added, the air content of the concrete is 6.0%.

[0060] In this example, the mud content of the sand in water washing is 0.3%, the fineness modulus is 3.0, and the gradation distribution: 4.75mm standard sieve accounts for 6%, 2.36mm standard sieve accounts for 20%, and 1.18mm standard ...

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Abstract

The invention discloses a self-compacting concrete, which belongs to the technical field of building materials. The self-compacting concrete of the present invention includes the following raw materials prepared by weight: sulphoaluminate cement: 380kg / m3-500kg / m3; admixture: 5.81kg / m3-10.76kg / m3; washed medium sand: 644kg / m3-740kg / m3; stones: 966kg / m3~1110kg / m3; water: 173kg / m3~2227kg / m3; the admixtures are polycarboxylate water reducer, silicon ether defoamer and retarder. The invention mainly solves the problems of honeycomb pitting, low strength and drying shrinkage when the self-compacting concrete prepared by the polycarboxylate high-efficiency water reducer is used in the sulphoaluminate cement in the prior art to produce high-quality prefabricated components , the high-quality prefabricated component prepared by the self-compacting concrete of the present invention has the advantages of smooth surface and high strength.

Description

technical field [0001] The invention relates to self-compacting concrete, which belongs to the technical field of building materials. Background technique [0002] Residential gardens, paving, and masonry high-quality concrete prefabricated components (hereinafter referred to as high-quality prefabricated components) require high-quality, economical and beautiful concrete prefabricated components, and require prefabricated components with honeycomb pockmarks, missing edges and corners, shrinkage cracks and flashing. Ordinary Portland cement is used to produce high-quality prefabricated parts, and the production cycle is long due to the long setting and hardening time of cement. At present, in order to save the construction period, some manufacturers use sulphoaluminate cement to prepare concrete when producing high-quality prefabricated parts. The cycle time of concrete mixing, forming, and demoulding is 4-6 hours, and the production period is relatively short, which is cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06C04B22/08C04B24/06C04B24/10C04B24/40C04B103/22C04B103/50
Inventor 夏艳晴王田堂肖邦伟李保宋磊
Owner JIAHUA SPECIAL CEMENT
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