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Highly durable high slump loss resistant no-bleeding concrete pump delivering agent

A concrete pump and bleeding technology, which is applied in the field of building materials, can solve the problems of large concrete slump loss, single cementitious material components, and high production costs, and achieve good product homogeneity, good segregation resistance, and high product quality. The effect of stable performance

Inactive Publication Date: 2008-08-20
HUNAN CONSTR ENG GRP COR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the application of concrete in some projects, there are problems: large amount of cement, single cementitious material components; large shrinkage of concrete, affecting the durability of concrete; large loss of concrete slump, affecting pumping performance
Polycarboxylate high-efficiency water reducer Compared with other high-efficiency water reducers, polycarboxylate water reducers can exert good dispersion performance at a low dosage (0.2% to 0.5%); but polycarboxylate water reducers There are adaptability problems with cement, it is difficult to meet the performance requirements of the project, and the production cost is high, so it has not been widely used in the project
[0006] According to another survey, the pumping agents currently on the market cannot inhibit concrete shrinkage, cannot control concrete cracks, but instead increase concrete shrinkage, causing cracks in commercial concrete to occur, cracking, corrosion, spalling, swelling, softness, and strength shrinkage. Decrease and other phenomena, shorten the life of buildings, affect the durability of concrete, and waste a lot of national construction funds

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: The raw material weight percentage of described high durable high slump and non-bleeding concrete pumping agent consists of: naphthalene series water reducer (β-naphthalene sulfonic acid methylene condensate) 40%, polycarboxylate water reducer 4%, sodium lignosulfonate 2%, sodium gluconate 1%, triterpene saponin 0.5%, carboxymethyl cellulose 1%, silicone oil (sodium methyl siliconate) 0.5%, water 51%; After uniform mixing, add in the cement concrete in the amount of 0.4% (weight ratio) of the cement consumption, and the performance of the concrete is detected as follows:

[0023] Table 1 Test results with standard cement

[0024]

[0025] 1. The water-reducing rate is 37%, which can control the concrete water-cement ratio and fluidity (slump and expansion); the concrete has good water retention, no bleeding, no segregation, and maintains good fluidity and cohesion. 1d concrete compressive strength can be increased by 80%, 28d strength ...

Embodiment 2

[0029] Embodiment 2: The raw material weight percentage of described high durable high slump non-bleeding concrete pumping agent is composed of: naphthalene series water reducer (β-naphthalene sulfonic acid methylene condensate) 38%, polycarboxylate water reducer 3.5%, sodium lignosulfonate 1.9%, sodium gluconate 1.2%, triterpene saponins 0.6%, carboxymethyl cellulose 1.2%, silicone oil (sodium methyl siliconate) 0.6%, water 53%.

[0030] After mixing the components evenly, add 0.4% (weight ratio) of cement into the cement concrete. The performance of the concrete is: the water reducing rate is 36%, the compressive strength of the concrete can be increased by 75% in 1d, and the strength can be increased in 28d. 70%. ;Concrete slump basically has no loss within 120min, and is not affected by temperature changes; the initial setting time is extended by 10h, which improves the early strength of concrete by 80%. The product has good adaptability to cement, and is compatible with ...

Embodiment 3

[0031] Embodiment 3: The raw material weight percent of described high durable high slump and non-bleeding concrete pumping agent is composed of: naphthalene series water reducer (β-naphthalenesulfonic acid methylene condensate) 40%, polycarboxylate water reducer 4%, sodium lignosulfonate 2%, sodium gluconate 0.8%, triterpene saponins 0.5%, carboxymethyl cellulose 0.9%, silicone oil (sodium methyl siliconate) 0.4%, water 51.4%.

[0032]After mixing all the components evenly, add 0.4% of the cement content (weight ratio) into the cement concrete. The performance of the concrete is: the water reducing rate is 36%, the compressive strength of the concrete can be increased by 76% in 1d, and the strength can be increased in 28d. 78%; the slump of concrete within 120 minutes is basically no loss, and is not affected by temperature changes; the initial setting time is extended by 7 hours, and the early strength of concrete is increased by 81%. The product has good adaptability to cem...

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Abstract

The invention relates to a non-bleeding concrete pumping admixture with high durability and high slump retaining, the raw material weight percentage composition of which is: 25 to 45 percent of naphthalene series water reducer, 2 to 6 percent of polycarboxylic series of water reducer, 1 to 4 percent of sodium lignosulfonate, 0.5 to 2 percent of sodium gluconate, 0.2 to 2 percent of triterpenoid saponin, 0.5 to 3 percent of carboxymethyl cellulose, 0.2 to 1 percent of silicon oil, and 40 to 65 percent of water; the non-bleeding concrete pumping aid with high durability and high slump retaining has the advantages of low slump loss and low cost, no bleeding, restraining the shrinkage of concrete, and controlling the fissure of concrete.

Description

technical field [0001] The invention relates to building materials, and is a high-durability, high-slump and non-bleeding concrete pumping agent. Background technique [0002] Concrete is a solid, liquid and gas three-phase coexistence, anisotropic heterogeneous composite material, these properties determine that it is a brittle material with a high probability of cracking. High-performance concrete has good construction performance, high strength, and good volume stability. The most important feature is to control concrete shrinkage and has high durability, which can reach 100-500 years, which is 3-10 times that of ordinary concrete. The high durability and long life of concrete are firstly to ensure the safety and reliability of the structure, but on the other hand, it is also a major issue to fundamentally save resources and energy and reduce pollution. For example, the average construction cost of existing reinforced concrete houses is 2,000 yuan / m 2 , per m 2 Need ma...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B24/18
CPCC04B40/0039C04B2103/0083C04B2103/308C04B2111/00146C04B2111/34
Inventor 周海兵陈浩肖燎彭琳娜钟少云罗银燕刑颖
Owner HUNAN CONSTR ENG GRP COR
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