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Underwater undispersed concrete flocculant

A concrete and coagulant technology, which is applied in the field of building materials, can solve the problems of slump loss, uncoordinated coagulation performance and flow performance, and low strength level of underwater anti-dispersion concrete, so as to achieve good filling and self-compacting properties Effect

Inactive Publication Date: 2014-01-22
江西省建筑材料工业科学研究设计院
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  • 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 ( C30 or less), uncoordinated coagulation release performance and flow performance, and high requirements for mechanical equipment
[0005] In related patents, there are also reports of preparing underwater anti-dispersion concrete by simply adding cellulose or polypropylene viscosifier (water retention agent), and the early strength is low and the slump loss is large, which is not suitable for remote concrete. Distance transmission and pumping construction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: The underwater non-dispersible concrete coagulant is composed of polyacrylamide, sodium lauryl sulfate, cellulose ether, polycarboxylate water reducer, silica fume, and finely ground mineral powder, polyacrylamide 35% ( % by weight, the same below), sodium lauryl sulfate 0.02%, silica fume 30%, ground mineral powder 26.97%, cellulose ether 0.01%, polycarboxylate superplasticizer 8%. The water-land strength ratio was 72% in 7 days, and 83% in 28 days; the expansion degree of the underwater non-dispersible concrete was 500mm, and the slump lost 10% over time in 1 hour.

Embodiment 2

[0014] Embodiment 2: The underwater non-dispersible concrete coagulant is composed of polyacrylamide, sodium lauryl sulfate, cellulose ether, polycarboxylate water reducer, silica fume, and finely ground mineral powder, polyacrylamide 30% ( % by weight, the same below), sodium lauryl sulfate 0.02%, silica fume 30%, ground mineral powder 27.96%, cellulose ether 0.02%, polycarboxylate superplasticizer 12%. The water-land strength ratio was 81% in 7 days, and 88% in 28 days; the expansion degree of underwater non-dispersible concrete was 550mm, and the slump loss was 0 in 1h.

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to an underwater undispersed concrete flocculant mainly composed of polyacrylamide, sodium dodecyl sulfate, cellulose ether, a polycarboxylate water reducer, silica fume and a fine-ground ore powder. The flocculant has quite strong dispersion resistance and relatively good fluidity, realizes self-leveling and self-compacting of the underwater concrete, inhibits dispersion of cement and aggregates during the underwater construction, besides, does not pollute construction water areas, and completely solves the influence of the old type flocculant unique 'flocculence' on construction machinery.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an underwater non-dispersible concrete coagulant. Background technique [0002] Ordinary concrete is directly poured underwater. Due to the effect of water erosion, the cement paste and aggregate in the concrete mixture are seriously separated, and the cement paste will be washed away by the water flow. There is not much cement paste in the pouring body, and the water When the rubber ratio is greatly increased, the uniformity of the concrete structure is extremely poor, the strength and durability are seriously reduced, and water resources are polluted. It is unimaginable that ordinary concrete is used for underwater pouring to cause pollution to the surrounding water environment and damage to aquatic organisms. [0003] For many years, in order to improve the quality of the underwater structure poured with ordinary concrete, engineering units have also ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38
Inventor 丁蕴斌柴天红
Owner 江西省建筑材料工业科学研究设计院
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