Polycarboxylate medium-efficiency pumping agent for ready-mixed commodity pumping concrete

Abstract

The invention relates to a polycarboxylate-type intermediate-efficiency pumping aid used for premix commodity pump concrete and applications of the pumping aid, and belongs to the field of building materials. The pumping aid is suitable for premix commodity pump concrete with intermediate-low strength levels. The pumping aid comprises following raw materials by weight: 4-20% of a slump-retaining water-reducing-type polycarboxylate-type high-efficiency water reducing agent having a solid content of 40%; 4-20% of a low-cost highly-water-reducing polycarboxylate-type high-efficiency water reducing agent having a solid content of 36%; 5-7% of magnesium lignosulphonate having a solid content of 50%, 1-5% of sodium gluconate, 0.02-0.1% of an air entraining agent and 0-3% of a high-performance viscosity modifier, with the balance being tap water. The concrete water reducing rate of the polycarboxylate-type intermediate-efficiency pumping aid having a solid content of about 13% is over 15%. The pumping aid can significantly improve the workability of newly stirred concrete and durability of hardened concrete. Products of the pumping aid are good in cement adaptability, stable in quality, low in cost, environmental-friendly, and prone to industrial production.

Description

technical field [0001] The invention relates to a polycarboxylate medium-efficiency pumping agent for concrete, belonging to the technical field of building materials, in particular to a polycarboxylate medium-efficiency pumping agent for ready-mixed commodity pumping concrete. Background technique [0002] Polycarboxylate high-efficiency water reducer is the third generation of high-efficiency water reducer developed after the first generation of ordinary water reducer represented by wood calcium and the second generation of high-efficiency water reducer mainly represented by naphthalene and aliphatic. It is a new high-efficiency superplasticizer with the highest scientific and technological content, the best application prospect and the best comprehensive performance in the world today. The product has a series of advantages such as high water reduction, high slump retention, high reinforcement, low shrinkage, low chlorine, low alkali content, safety and non-toxicity, etc....

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that when the high-concentration polycarboxylate superplasticizer is directly mixed into medium and low-strength concrete, due to the reduction in cement consumption, water consumption, and small amount of superplasticizer, it is impossible to ensure a suitable slurry bone. Compared with concrete, it is easy to scratch the bottom and harden, so it cannot be used

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