Liquid, chlorine-free, early-strength anti-freezing polycarboxylate composite water reducing agent and preparation method thereof

Abstract

The invention relate to a liquid early-strength and antifreezing type polycarboxylate compound water reducer without chlorine and a preparation method thereof. The water reducer is prepared with the following components in weight proportion: 6-12percent of early-strength type polycarboxylate water reducer, 4-10 percent of organic antifreezing component, 1.5-3 percent of organic early-strength component, 10-25 percent of inorganic early-strength catalyst, 0.3-0.5 percent of air-entrained component, and the rest is water. The preparation method is that every component is weighed according to the weight percentage of every component and then put into a reaction vessel and stirred slowly for 10-30 minutes. The addition of the invention is 0.5-1.5 percent of cementing material content, compared with the normal concrete; the water-reducing rate can amount to more than 20 percent, and the long-term strength of concrete is obviously increased. The liquid early-strength and antifreezing type polycarboxylate compound water reducer can be used for preparation of concrete with various strength grades from C20 to C80, has good antifreezing performance and can be used for the concrete constructed under circumstance with daily minimum temperature above 20 DEG C below zero.

Description

technical field [0001] The invention relates to an antifreeze concrete admixture, in particular to a liquid, chlorine-free early-strength antifreeze polycarboxylate composite water reducer and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] The construction industry is generally constructed outdoors, and construction can still be carried out when the outdoor temperature is above zero, but in winter, when the outdoor temperature is below zero, the concrete will be frozen. Construction cannot be done for a period of time. In order to solve the freezing problem of concrete, people often add an appropriate amount of antifreeze to the concrete to lower the freezing point of the concrete, thereby solving the problem of winter construction. JC475-2004 "Concrete Antifreeze" divides antifreeze into five categories according to the difference in composition: the first category is chlorine salt antifreeze, which has ...

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Problems solved by technology

Chinese patent 96109810.4 discloses a high-efficiency liquid antifreeze with ethylene glycol and urea as the main antifreeze components, but the dosage is high, which is 4% of the cement consumption, and urea will produce ammonia under the alkaline condition of concrete, thereby pollute the environment and endanger human health

Chinese patent 92102097.X discloses a composite antifreeze with sodium nitrite, sodium sulfate, and calcium nitrate as antifreeze components. The antifreeze has a high alkali content and uses nitrite, which is unfavorable and harmful to the durability of concrete. Defects in the health of operating workers

Chinese patent 94105915.4 discloses a kind of antifreeze agent for alkali-free concrete, but the antifreeze component has adopted nitrite or urea. Large defects, either high in alkali, or containing chloride ions, or containing urea, or containing nitrite

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