Clay-resistant concrete functional admixture and preparation method thereof

Abstract

The invention discloses a clay-resistant concrete function additive and a preparation method thereof and belongs to the field of concrete additives. The additive is prepared by mixing and grinding the following components in percentage by weight: 35-55% of lime, 15-25% of ferrous sulfate, 10-20% of sodium metasilicate, 5-15% of a polycarboxylate-type water reducer mother liquid and 0.1-5% of a cationic surface active agent. During use, the additive which is 1-1.5% of the use level of cementing materials is mixed with a gravel material with the clay content of about 10% in concrete, a part of water and the like firstly, and cementing materials such as cement coal ash, mineral powder and the like, a water reducer and residual water are further added to obtain high performance concrete, wherein the extended degree is over 600mm, the slump degree time is 5-10 seconds, the workability of concrete after 1 hour is still extremely good and the compressive strength within 28 days is qualified. According to the additive, the use level of cement is reduced by over 20%, so that the problem that the silt content in the polycarboxylate-type water reducer and the concrete material is great is solved. The additive has a wide application prospect.

Description

technical field [0001] The present invention relates to the field of concrete admixtures, in particular to a polycarboxylate water reducer used for machine-made sand concrete with high clay stone powder content, natural sand concrete with high mud content, stone chip concrete with complex components and recycled concrete, etc. A clay-resistant concrete functional admixture for high-performance concrete and a preparation method thereof. Background technique [0002] Clay minerals have a great influence on the performance of concrete. First, clay minerals are easy to absorb water and cause volume expansion, which accelerates the loss of concrete fluidity or slump, and the concrete has problems such as insufficient slurry and very dry. Further higher, the result is the increase in the amount of water reducing agent and the increase in the control of concrete slump loss requirements; secondly, the water-cement ratio required to achieve the same working degree under the same conc...

AI Technical Summary

Problems solved by technology

In addition, there are also some that reduce the consumption of bentonite on polycarboxylate superplasticizers by compounding different types of additives as sacrificial agents or shielding agents, such as CN101798197A, which uses natural zeolite as a slow-release agent to absorb a large amount of polycarboxylate superplasticizers To reduce the influence of clay, the release rate and effect of the polycarboxylate superplasticizer adsorbed into the zeolite cannot be guaranteed, and the initial dispersion performance of the polycarboxylate superplasticizer cannot be exerted

Most of the above-mentioned patents excessively inhibit clay activity by changing admixtures or excessively use sacrificial agents to resist clay. In fact, it also affects the activity of other cement-based powders. The workability of concrete is solved, but the strength of concrete is reduced. The final application The effect is not ideal

Images