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A retarder and concrete technology, applied in the chemical industry, can solve the problems of insufficient sodium gluconate retardation, excessive non-condensation, etc., and achieve the effect of good retarding performance and wide adaptability
Inactive Publication Date: 2014-07-02
陈志军
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Problems solved by technology
[0006] The invention solves the problem of insufficient retardation of sodium gluconate under high temperatur
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[0019] Example 1
[0020] The concrete retarder of the present invention is composed of the following raw materials in weight percentage: 15% syrup, 10% disaccharide, 30% anion, 8% sodium phosphate, 5% sodium tripolyphosphate, 8% ammonium persulfate, 24% water .
[0021] The specific steps of the method of preparing concrete retarder are as follows: adjust the temperature of the purchased disaccharide to above 0℃, dissolve and release the disaccharide and syrup with a weight ratio of 50% each, dissolve for 10-20 minutes, stir well, and heat When it reaches 20°C, start to add ammonium persulfate dropwise, dissolve 5% of the total weight in water and add it dropwise at a high position, react for half an hour, control the temperature at 20°C±2, keep it for 20 minutes at the end of the reaction, and then add anions, sodium phosphate, three The sodium polyphosphate component was stirred for 10 minutes to prepare a concrete retarder.
Example Embodiment
[0022] Example 2
[0023] The concrete retarder of the present invention is composed of the following raw materials in weight percentage: 40% syrup, 5% disaccharide, 20% anion, 3% sodium phosphate, 1% sodium tripolyphosphate, 3% ammonium persulfate, 28% water .
[0024] The preparation method is the same as in Example 1.
Example Embodiment
[0025] Example 3
[0026] The concrete retarder of the present invention is composed of the following raw materials by weight percentage:
[0028] The preparation method is the same as in Example 1.
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Abstract
The invention discloses a concrete retarder. The concrete retarder comprises the following raw materials by weight percent: 10-40% of low-grade syrup, 5-10% of primary disaccharide, 20-30% of anions, 3-8% of sodium phosphate, 1-5% of sodium tripolyphosphate, 3-8% of ammonium persulfate and 20-30% of water. The concrete retarder has the positive effects that good retarding effects are achieved through synthetic combination by utilizing common disaccharide instead of high-price sodium gluconate; in the early period, the retarder has early water reduction and retarding effects similar to the early water reduction and retarding effects of sodium gluconate; under long-time action, the concrete retarder is gradually released by utilizing slow release of carboxyl salt and maintains retarding; the concrete retarder has the greatest characteristics that the concrete retarder changes the function after achieving the aim and plays a role in accelerating setting; the concrete retarder has the advantages of wide adaptability and good retarding property at high temperature.
Description
technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a concrete retarder and a preparation method thereof. Background technique [0002] Concrete retarder is a kind of concrete setting regulator, which delays the initial setting and final setting time of concrete without affecting the later strength of concrete. It can be used alone or in combination with water-reducing agents, etc., and has a certain water-reducing effect. [0003] Commonly used mainly are lignin, sugar, phosphate, tartrate, gluconate, citric acid and its salts, cellulose and its derivatives, etc. [0004] The function is to delay the solidification of cement and prolong the solidification time. Generally, it does not affect the quality of concrete. When used together with water reducing agent, it can increase the water reducing rate. After over-mixing, the concrete will not solidify for a long time, thus destroying the quality of concrete. Pay atte...
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