CN100381386C

CN100381386C - Efficient retarding and water reducing agent for concrete

Info

Publication number: CN100381386C
Application number: CNB2006100910708A
Authority: CN
Inventors: 杭美艳; 李斌; 赵根田; 赵俊梅; 李梅; 柳召刚
Original assignee: Inner Mongolia University of Science and Technology
Current assignee: Inner Mongolia University of Science and Technology
Priority date: 2006-07-13
Filing date: 2006-07-13
Publication date: 2008-04-16
Anticipated expiration: 2026-07-13
Also published as: CN1887775A

Abstract

The present invention relates to one kind of efficient retarding and water reducing agent for concrete suitable for commercial concrete, pumped concrete and bulk concrete. The efficient retarding and water reducing agent consists of water reducing agent 0-90 wt%, retarder I 1-15 wt%, retarder II 0.5-25 wt% and shrinkage reducing agent 0.05-0.2 wt%. The efficient retarding and water reducing agent has simple preparation process, and has the effects of delaying the setting of concrete, raising early strength, reducing water, etc.

Description

Efficient retarding and water reducing agent for concrete

One, technical field

The present invention relates to a kind of efficient retarding and water reducing agent for concrete, be applicable in commerical ready-mixed concrete, pump concrete and the mass concrete and use, belong to building material field.

Two, background technology

In now large-scale engineering construction, not only requiring has modern operating technique and construction means, simultaneously concrete has also been proposed multi-functional performance requriements.For example, Highrise buildings pump concrete and remote transportation concrete for keeping its good working performance, need concrete to have big fluidised form and slow setting; Mass concrete is when hot weather construction, and is too concentrated in order to prevent hydration heat, avoids concrete to produce thermal stress cracks, need then that hydration heat of concrete is low, heat release slowly, concrete has slow setting; And in different engineerings,, then requiring concrete to have early strong or each age strength etc. according to different needs, the raising of all these concrete technical features and improvement all realize by mixing water reducer.

Existing both at home and abroad water reducer is various in style, and amount ratio is wider the lignosulfonic acid salt, how to be water reducers such as Sulfonates and melamine sulfonate class, and the water reducer that is composited by them.How being the water reducer that Sulfonates and melamine sulfonate class are composited, early potent fruit is better, and later strength is also higher, but retarding effect is not obvious, and cost is higher.Though lignin sulfonic acid salt water reducer cost is lower, its morning, how strong and water-reducing effect was less than being the water reducer that Sulfonates and melamine sulfonate class are composited.The single molasses retardant of composition, retarding effect is better, but early potent fruit is undesirable.

Three, summary of the invention

The technical problem that the present invention solves is: prevent the concrete early-age shrinkage, avoid producing the crack, improve concrete intensity, have good retarding effect and water-reduction, and can regulate proportion of raw materials, reach the demand of different time of coagulation according to the service requirements of different user, and alkali-free is not chloride, reinforcing bar is not had corrosive nature, and production technique is simple, and cost is low.

Technical solution: the present invention is made up of the weight percent of following material: water reducer 60～90%, Sunmorl N 60S 1～15%, sugared calcium or wooden calcium or sugar or citric acid or tripoly phosphate sodium STPP, perhaps two or more in them mixes use 0.5～25%, ether of cellulose 0.05～0.2%.

Water reducer is naphthalenesulfonate formaldehyde condensation compound water reducer or sulfamate water reducer, or the two compound use.

Efficient retarding and water reducing agent of the present invention can make the cement particle disperse, and improves concrete workability; Can reduce unit consumption of water, concrete strength be increased, and improve concrete weather resistance; Can reduce unit cement consumption, reduce the concrete cost.

The present invention reasonably arranged in pairs or groups naphthalenesulfonate formaldehyde condensation compound water reducer or retardant such as sulfamate water reducer, Sunmorl N 60S, sugared calcium or wooden calcium, so have good retarding effect and water-reduction, and can regulate proportion of raw materials according to the service requirements of different user, reach the demand of different time of coagulation.Efficient retarding and water reducing agent of the present invention is mixed by various raw materials, and production technique is simple, and cost is low.And the present invention added economization agent, can prevent the concrete early-age shrinkage, avoids producing the crack, improves concrete intensity.Product alkali-free of the present invention is not chloride, and reinforcing bar is not had corrosive nature.Product of the present invention has the concrete coagulating time of delaying, effect such as strong, diminishing early.Product of the present invention uses in concrete that to have a volume low, the obvious results characteristics.Efficient retarding and water reducing agent cost of the present invention is low, and diminishing, retarding effect are good, have good economic benefits and social benefit.

The invention effect

The present invention is an efficient retarding and water reducing agent, through various performance tests and test, has following characteristics and function:

1. the present invention compares with other water reducer of the same type, and is multiple functional, good combination property.Product water-reducing effect of the present invention increases, and delayed coagulation is remarkable, and can improve early stage and each age strength of concrete.After product of the present invention mixes concrete, can make concrete water-reducing ratio reach 25～30%; Delay 10～20 hours time of coagulation, in addition longer; Intensity improved 20～30% in 3 days, 7 days.Intensity improved 20% in 28 days; Shrinkage ratio was less than 120% in 28 days.

2. efficient retarding and water reducing agent production technique of the present invention is simple, cost is low, uses to have the low characteristics of volume in concrete, also has to delay or reduces hydration heat of cement adjusting time of coagulation; Have preferably early potent fruit and late-enhancement effect; Improve mechanical properties of concrete comprehensively; Improve pumpability of concrete, reduce slump-loss, improve concrete workability, reduce concrete surface and shrink and the crack, improve concrete impermeability and weather resistance etc.; Make that concrete air content is little, bleeding is few, and easy construction improves work efficiency, can improve concrete over-all properties comprehensively.

Five, embodiment

Embodiment 1, a kind of efficient retarding and water reducing agent for concrete

This efficient retarding and water reducing agent is made up of naphthalenesulfonate formaldehyde condensation compound water reducer, sulfamate water reducer, Sunmorl N 60S, sugared calcium and economization agent, and the proportioning of various materials is:

Naphthalenesulfonate formaldehyde condensation compound water reducer 60%

Sulfamate water reducer 20%

Sunmorl N 60S 4.5%

Sugar calcium 15.41%

Ether of cellulose 0.09%

The efficient retarding and water reducing agent of present embodiment gained mixes in the concrete and uses, and volume is 1.0%, and its performance provides in table 1.Present embodiment be mainly used in the above high-strength concrete of preparation C60, and concrete is lower with material cost because the compound action of sulfamate water reducer and naphthalene water reducer improves much concrete water-reducing rate, and prolong time of coagulation.

Embodiment 2, a kind of efficient retarding and water reducing agent for concrete

This efficient retarding and water reducing agent is made up of naphthalene sulfonic acid condensate water reducer, Sunmorl N 60S, citric acid, tripoly phosphate sodium STPP and economization agent, and the proportioning of various materials is:

Naphthalene sulfonic acid condensate water reducer 86%

Sunmorl N 60S 8%

Citric acid 3.4%

Tripoly phosphate sodium STPP 2.55%

Ether of cellulose 0.05%

The efficient retarding and water reducing agent of present embodiment gained mixes in the concrete and uses, and volume is 1.2%, and its performance provides in table 1.Present embodiment is because the compound action of multiple retardant, make under the prerequisite that concrete water-reducing rate meets the demands, delay longer time of coagulation, do not influence concrete 3d intensity, and later strength does not reduce, have slow setting requirement or mass concrete below being mainly used in preparation C55, and concrete is lower with the starting material production cost.

The performance of the efficient retarding and water reducing agent of table 1 the invention process gained

Claims

1. efficient retarding and water reducing agent for concrete, it is characterized in that: the weight percent by following material is formed:

Water reducer 60～90%

Sunmorl N 60S 1～15%

Sugar calcium or wooden calcium or sugar or citric acid or tripoly phosphate sodium STPP, perhaps two or more in them mixes use 0.5～25%

Ether of cellulose 0.05～0.2%.

2. a kind of efficient retarding and water reducing agent for concrete according to claim 1 is characterized in that: water reducer is naphthalenesulfonate formaldehyde condensation compound water reducer or sulfamate water reducer, or the two compound use.