Sustained-release water reducing agent for cement concrete and method for preparing same

Abstract

The invention provides a cement concrete slowly-released water reducer. The cement concrete slow-released water reducer is characterized in that the water reducer consists of bimetal hydrate, and a cement concrete used water reducer dispersed in the stratiform bimetal hydrate; the stratiform bimetal hydrate is stratiform MgAl bimetal hydrate or stratiform CaAl bimetal hydrate; the water reducer is a water reducer of naphthalene series or a water reducer of poly carboxylic acid series; the preparation method of the slowly-released water reducer comprises the steps of preparing the stratiform bimetal hydrate, preparing a bimetal oxide and preparing the slowly-released water reducer and so on. In the invention, the roasted product of the stratiform bimetal hydrate, namely, the bimetal oxide, is added to the solution containing the water reducer which enters the layers during the reconstruction of the stratiform structure, thus preparing the powdered water reducer. When the water reducer having the slow release performance is added to and mixed in the concrete at one time, the water reducer is released slowly, thus effectively reducing the loss of the slump constant of concrete; the transportation cost of the powdered slowly-released water reducer can be significantly reduced.

Description

technical field [0001] The invention belongs to organic-inorganic materials as effective components of concrete and its preparation method, and relates to a slow-release water reducer for cement concrete and its preparation method, in particular to a powdered water reducer with slow release effect and its preparation method . Background technique [0002] Since the British Joseph Aspdin (Joseph Aspdin) invented Portland cement in 1824, the production and application technology of concrete has developed rapidly, the amount of concrete has increased sharply, and the scope of use has expanded day by day. At present, concrete has become one of the most important engineering materials. The development of modern concrete water reducing agent technology is the key to the development of modern concrete technology and plays a decisive role in the development of concrete technology. The innovation and development of concrete water reducing agent technology has always been Emphasis an...

AI Technical Summary

Problems solved by technology

In the prior art, the water reducer used in cement concrete generally adopts liquid naphthalene-based water-reducer or polycarboxylate-based water-reducer. During the use of these water-reducers, the following problems often occur: pumping difficulties and Concrete slump loss is too fast and rapid hardening

The most commonly used method to control slump loss is to rely on the addition of retarders, but the addition of retarders will affect the development of early strength of concrete, which is very unfavorable in many occasions

In addition, since liquid water reducers are not easy to store, especially for engineering construction in remote areas, long-distance transportation will greatly increase transportation costs, and the practicability is poor

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