A special admixture for colored concrete and its application and usage method

Abstract

The invention provides an admixture special for color concrete and an application method and using method of the admixture. The special admixture comprises a water reducing disperse component and a modified durable component, wherein the water reducing disperse component comprises the following components in parts by mass: 8-20 parts of modified lignosulfonate, 15-35 parts of polymethylene sodium naphthalene sulfonate, 1-5 parts of sodium dodecyl sulfate and 50-70 parts of water; the modified durable component comprises the following components in parts by mass: 5-16 parts of styrene-maleimide, 15-28 parts of organic silane coupling agent, 8-20 parts of stearate, 40-60 parts of redispersible polymer powder and 3-7 parts of inhibitor. According to the special admixture provided in the invention, alkali returning of the color concrete can be inhibited, and the workability, glossiness and durability of the concrete are improved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a special admixture for colored concrete and its application and usage method. Background technique [0002] With the improvement of people's living standards, urban infrastructure construction not only meets the functional requirements, but also people pursue natural and simple living space and high-grade living environment. Colored concrete technology system has strong artistry, environmental protection, color And the diversity of styles, easy construction, various changes, low cost and no impact on the environment have made it develop rapidly in China. After years of development and improvement, the product is rational in process and stable in special chemical materials. It has reached a very mature level in terms of safety, environmental protection and decorative effect. The scope of application has developed from outside to indoor, from garden landscaping to entertainment, mu...

AI Technical Summary

Problems solved by technology

[0003] However, during the construction of colored concrete, due to factors such as finer particles of pigments than cement and poor processing performance of pigments, it is easy to cause pigment agglomeration and difficult to disperse, and due to the adsorption of admixtures by the pigment itself and impurities, the initial color concrete The slump is small and the slump loss is large, which seriously affects the construction of colored concrete

[0004] In the prior art, polycarboxylate high-efficiency water reducers are commonly used as superplasticizers in admixtures, which have relatively high requirements for concrete raw materials, especially the soil content of sand and gravel materials makes polycarboxylate high-efficiency water reducers and The adaptability of cementitious materials is poor, and its cost is relatively high. In actual production, the application of polycarboxylate superplasticizers for concrete below C60 is relatively seldom

[0005] For this reason, manufacturers often increase the slump of colored concrete by increasing water consumption, but this is the premise of sacrificing the strength of concrete

[0006] In addition, Ca(OH) in cement concrete 2 The hydration products move to the surface of the concrete through the capillary channel to form back alkali, which has a certain influence on the color of the colored concrete

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