High-efficiency retarding water reducer for cement concrete and preparation method thereof

Abstract

The invention provides an efficient set-retarding and water-reducing agent for cement concrete and a preparation method of the efficient set-retarding and water-reducing agent. The efficient set-retarding and water-reducing agent comprises the following components in parts by weight: 30 to 50 parts of polycarboxylic acid mother liquid, 3 to 5 parts of poly-aluminum chloride, 0.5 to 2 parts of sodium polyaspartate, 10 to 30 parts of allyl polyoxyethylene ether, 0.5 to 0.8 part of coco fatty acid diethanol amide, 5 to 10 parts of hydrogen peroxide, 0.5 to 1.2 parts of mirabilite, 3 to 10 parts of an air entraining agent, 15 to 30 parts of hydrophilic colloid, 1 to 3 parts of a set retarder, 5 to 10 parts of fiber, 1 to 5 parts of asbestos wool, 0.1 to 0.2 part of an initiator and 30 to 50 parts of deionized water. The efficient set-retarding and water-reducing agent is prepared by optimizing the components of the set-retarding and water-reducing agent, modifying part of the components and mixing, so that the efficient set-retarding and water-reducing agent has high compatibility with cement, is small in mixing amount and high in water-reducing rate, can enhance the compression resistance and the fracture resistance of concrete, has a good set-retarding effect, long concrete setting time, high strength and high construction performance, saves construction materials, can save waterand electricity and has high practical value.

Description

technical field [0001] The invention relates to the technical field of retarded water reducers, in particular to a high-efficiency retarded water reducer for cement concrete and a preparation method thereof. Background technique [0002] Since the beginning of the 20th century, engineering structures using concrete as building materials have developed rapidly, and it has become the material of choice for bridges, dams, highways and urban transportation systems, a modern symbol. The tallest building in the world today is a building made of concrete, that is, the Petronas twin towers built in Malaysia in 1998; the deepest drilling platform in the world is also made of concrete, that is, Norway, which was built in 1998 and is taller than the famous Eiffel Tower. Troll platform. However, it must be pointed out that these astonishing achievements in the field of concrete were actually achieved by admixtures rather than the result of advances in the field of cement production. A...

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Problems solved by technology

[0004] However, in the actual use of concrete engineering, the polycarboxylate water reducer has the problem of cement compatibility, and its use effect is greatly affected by the composition of the cement, and the water reducing and dispersing performance of the polycarboxylate water reducer is poor.

The existing retarding superplasticizer is difficult to form an insoluble film on the surface of cement particles, which is difficult to act as a barrier to the hydration of cement and hinders the normal hydration of cement. These will lead to faster hydration of cement, or slow down The coagulation effect is not obvious, which shortens the normal setting time of cement and reduces the working performance of concrete

At present, the development of domestic polycarboxylate water reducer products is not yet mature, and there are few varieties, which are difficult to meet the functional and diversified market demand, and further development and improvement are needed

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