Underwater antidispersion concrete admixture for building

A concrete admixture and anti-dispersion technology, applied in the field of building materials, can solve the problems of not adapting to the new requirements of mechanical properties and durability, not suitable for long-distance transportation and pumping construction, and large loss of concrete slump, so as to achieve improvement Freeze-thaw cycle resistance, labor saving, and water repellency improvement

Inactive Publication Date: 2003-11-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, looking at the research and application results of underwater anti-dispersion concrete in the past, due to the limitations of the anti-dispersion agent used and the performance of the prepared underwater anti-dispersion concrete, the strength level of the poured underwater anti-dispersion concrete is generally low ( Below C30), corrosion resistance, frost resistance, and Cl resistance to underwater anti-dispersion concrete - There are fewer studies on durability such as permeability, and it is increasingly incompatible with the new requirements of actual engineering for the mechanical prope

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, underwater anti-dispersion concrete admixture for building is by methylcellulose 12% (percentage by weight, the same below), polyacrylamide 18%, sodium dodecylbenzenesulfonate 0.5%, naphthalenesulfonic acid formaldehyde condensate 59%, stearic acid 0.5%, zeolite powder 10%, mixed with the anti-dispersant agent (the amount of anti-dispersant agent is 1.2% of the cement weight), the water-land strength ratio of the concrete can reach 80% (7 days ) and 86% (28 days), and when the dosage reaches 1.5%, the strength ratio of concrete water and land can reach 87% and 90%.

Embodiment 2

[0027] Embodiment 2, underwater anti-dispersion concrete admixture for construction is 9% of methylcellulose, 13% of polyacrylamide, 0.4% of sodium dodecylbenzenesulfonate, 59% of naphthalenesulfonic acid formaldehyde condensate, 0.6% of stearic acid %, zeolite powder 18%, can be used in the total amount of gelling material 580kg / m 3 , anti-dispersant dosage 1.2% B, sand rate 44%-50%, the preparation of slump 24cm, slump expansion 58cm, 1 hour slump loss is not more than 4cm, 28 days compressive strength up to C50 concrete.

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PUM

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Abstract

The present invention relates to an underwater antidispersion concrete additive, which is formed from methyl cellulose, polyacrylamide, sodium dodecyl benzene sulfonate, naphthalene series high-effective water reducing agent, octadecanoic acid and zeolite powder. Said invention can be used for underwater direct pouring construction, does not disperse or does not separate, and can automatically fill form and automatically compact under water, and can raise the concrete structure body performance after the concrete is poured under water, and can simplify underwater pouring process and reduce environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to an underwater anti-dispersion concrete admixture for building water. Background technique [0002] Ordinary concrete is directly poured underwater. Due to the impact of water flow, the cement paste and aggregates in the concrete mixture are severely separated, and the cement paste will be washed away by the water flow. Not only is there less cement paste in the cast body, but also water The / glue ratio is greatly increased, the uniformity of the concrete structure is extremely poor, and the strength and durability are seriously reduced. It is unimaginable that the use of ordinary concrete for underwater pouring will cause pollution to the surrounding water environment and damage to aquatic organisms. [0003] Over the years, in order to improve the quality of ordinary concrete poured underwater structures, engineering units have also adopted a variety of special const...

Claims

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Application Information

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IPC IPC(8): C04B22/08C04B24/22C04B24/38
Inventor 孙振平蒋正武
Owner TONGJI UNIV
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