Polycarboxylic acid-type high-water reducing and slump resistant early strength pumping aid

Abstract

The invention relates to a polycarboxylic acid-type high-water reducing and slump resistant early strength pumping aid which is composed of the following substances: 60-80wt% of polycarboxylic acid ester additive with concentration of 20%, 5-7wt% of polycarboxylate additive with concentration of 20%, 0.5-1.0wt% of sodium thiosulfate, 1-2wt% of sodium gluconate, 1-2wt% of sodium lignin sulfonate, 0.2-0.4wt% of ionic membrane alkali, 0.1-0.2wt% of lauryl sodium sulfate, 0.2-0.4wt% of isothiazolinone type antiseptic and mould proof fungicide and 12-27wt% of deionized water. The preparation method comprises the following steps: chemically combining the polycarboxylic acid ester additive, the polycarboxylate additive and the sodium thiosulfate in water of 40-50 DEG C, and adding sodium gluconate and sodium lignin sulfonate for compounding; cooling to the room temperature, adding the ionic membrane alkali to regulate the pH to 6-8, adding the lauryl sodium sulfate and the isothiazolinone type antiseptic and mould proof fungicide to prepare a product. The product can improve the water-reducing rate, the concrete peaceability and the slump protection at early construction stage and enhance the early strength and long durability of concrete. The product is especially suitable for concrete with early slump protection and early strength demands and self-compaction concrete with large volume and high performance.

Description

technical field [0001] The invention relates to a high-efficiency pumping agent of high water-reducing, slump-preserving and early-strength type polycarboxylate, which belongs to the field of new material science, and is especially suitable for concrete with requirements for initial slump-retaining and early-strength, and can be used for large-volume, self-contained concrete. Dense, high performance concrete. Background technique [0002] Concrete admixtures are one of the basic components of concrete, among which superplasticizers are widely used. Traditional high-efficiency water reducers include naphthalene, melamine, and sulfamic acid salts, which produce formaldehyde that is harmful to the environment during their production process, which does not comply with national environmental protection policies. At the same time, the development of special concrete such as self-compacting concrete, high-performance concrete, and ultra-high-strength concrete requires better high...

AI Technical Summary

Problems solved by technology

For example: high-concentration polycarboxylate products, the water-reducing rate is too high, concrete is more sensitive to water consumption, it is difficult for concrete production enterprises to control water consumption, and the price is relatively expensive, which cannot reduce the cost of concrete; low-concentration polycarboxylate products Reducing the concentration and compounding can effectively reduce the cost of concrete and reduce the sensitivity of concrete to water consumption. However, in some cements, the slump loss is large, and the specific performance sometimes cannot meet the construction requirements; Smaller, but the strength of concrete is sometimes not much different from that of non-polycarboxylate admixture products, etc.

[0004] At present, according to the synthesis and compounding theory of polycarboxylic acid products, there are various types of polycarboxylic acid products for synthesis and compounding. Among them, the slump-preserving type and the early-strength type have conflicts in their performance. The early-strength type product has good slump-preserving performance, but the early strength of concrete is affected. The early-strength product has high early-strength concrete, but the initial slump-preserving performance is poor.

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