CN101987784A

CN101987784A - Concrete delayed coagulation air entraining agent

Info

Publication number: CN101987784A
Application number: CN2010102787329A
Authority: CN
Inventors: 蒋德双
Original assignee: CHONGQING DAHUA CONCRETE ADDITIVE TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: CHONGQING DAHUA CONCRETE ADDITIVE TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2010-09-10
Filing date: 2010-09-10
Publication date: 2011-03-23

Abstract

The invention relates to a building material, in particular to a concrete delayed coagulation air entraining agent which comprises the following components in parts by weight: 2-5 parts of lauryl sodium sulfate, 20-30 parts of sodium dodecyl benzene sulfonate (SDBS), 15-25 parts of white sugar, 10-16 parts of sodium hexametaphosphate, 12-18 parts of sodium gluconate and 22-25 parts of secondary coal ash. The invention has the following advantages: 1, the production process is simple and practicable; 2, the doping amount of the air entraining agent is less, and the cost is low; 3, the doping amount of the air entraining agent accounts for 0.2-0.8% of gelled materials; and 4, after the air entraining agent is doped, the hydration heat of mass concrete can be effectively inhibited, the centralized release of the hydration heat peaks of the concrete can be reduced, the concrete can be prevented from generating cracks, the bleeding rate of the concrete is lowered, the workability of the concrete is improved, and the durability of the concrete can be enhanced.

Description

The concrete retarding air entrapment agent

Technical field

The present invention relates to material of construction, especially a kind of slow setting air entrapment agent of making the concrete interpolation.

Background technology

Now, along with the continuous expansion of construction scale, concrete has also been proposed the Concrete Construction of multi-functional performance requriements, particularly large volume, no matter be in the winter time or in other seasons, hot weather construction is particularly evident, discharges in order to prevent that hydration heat from too concentrating, and avoids concrete to produce thermal stress cracks, then need low, the slow heat release of hydration heat, concrete needs slow setting, shrinks and the crack thereby reduce concrete surface, improves concrete impermeability and weather resistance.At present, concrete admixture with slow setting has high-performance water reducing agent, high efficiency water reducing agent, ordinary water-reducing agent, pumping agent, retardant etc. by the GB8076-2008 standard, and use high-performance water reducing agent, high efficiency water reducing agent, pumping agent effect fine, but cost is higher relatively; The retarding water reducer of ordinary water-reducing agent mainly is meant wooden calcium, wooden sodium etc., though price is low, volume is few, with the bad adaptability of cement, particularly contains the cement of fluorgypsum or anhydrite, tends to occur " false set " or long-time noncondensing phenomenon; Its air content of product that various explained hereafter of while are come out is widely different again, though retardant energy slow setting does not have air content, and the bleeding rate height, concrete parcel is poor, and weather resistance can not get guaranteeing.

Summary of the invention

It is simple to the purpose of this invention is to provide a kind of prescription, and raw material is easy to get, and is convenient for production, can effectively suppress the hydration heat of mass concrete, the concrete retarding air entrapment agent of raising weather resistance.

Technical scheme that purpose of the present invention adopts is, sodium lauryl sulphate, the Sodium dodecylbenzene sulfonate of content 〉=80%, the white sugar of content＞95%, the sodium hexametaphosphate of content 〉=68%, the Sunmorl N 60S of content 〉=98%, second class powered coal ash by content 〉=90% are formed, and its composition is by weight:

Sodium lauryl sulphate 2-5 part

Sodium dodecylbenzene sulfonate 20-30 part

White sugar 15-25 part

Sodium hexametaphosphate 10-16 part

Sunmorl N 60S 12-18 part

Second class powered coal ash 22-25 part.

The present invention by weight dropping in the mixing machine one by one, fully stirred above-mentioned composition 40 minutes, get final product product of the present invention.

The invention has the advantages that: 1. production technique is simple, and product alkali-free and not chloride does not have corrosive nature to reinforcing bar.(2. volume is few, and cost is low, has slow setting and bleed effect.3. volume is the 0.2-0.8% of gelling material, according to the needs and the durability requirement of concrete coagulating time, adjusts volume voluntarily by the user.4. mixing of product of the present invention can be suppressed the hydration heat of mass concrete effectively, reduces the concentrated release of hydrated cementitious thermal spike, prevents that concrete from producing the crack, reduces concrete bleeding rate, improves workability, strengthens concrete weather resistance.

Embodiment

Further specify the present invention below in conjunction with embodiment.

Drop into one by one in the mixing machine that 11 kilowatt motors, speed reduction unit model are 60 rev/mins of BL-23-11, rotating speed by weight Sunmorl N 60S 140kg, second class powered coal ash 250kg the sodium hexametaphosphate 140kg of the white sugar 170kg of the Sodium dodecylbenzene sulfonate 270kg of the sodium lauryl sulphate 30kg of content 〉=90%, content 〉=80%, content＞95%, content 〉=68%, content 〉=98% in batches, fully stirred 40 minutes, promptly get this product.

Sampling is tested by gelling material 0.5%, and it is as shown in the table to be examined concrete performance index:

Conclusion: from being examined concrete performance as can be seen, slow setting air entrapment agent of the present invention mixes in the concrete, reduced concrete bleeding, retarding effect is obvious, has suppressed concrete hydration heat effectively, reduced the concentrated release of hydrated cementitious thermal spike, prevent the generation of distress in concrete, reduced concrete contraction, weather resistance increases substantially, concrete intensity did not only descend in 28 days, also had increase to a certain degree on the contrary.

Claims