Polycarboxylate retardant high-efficiency pumping aid and preparation method thereof

Abstract

The invention discloses a polycarboxylate retardant high-efficiency pumping aid and a preparation method thereof. The polycarboxylate retardant high-efficiency pumping aid is prepared from bed charge,a material A and a B, wherein the bed charge is prepared from the following components in parts by mass: 1500-2000 parts of polyoxyethylene ether macromonomer, 20-30 parts of oxidizing agent, 50-100parts of malt sugar, 30-50 parts of sucrose, 1000-1200 parts of water; the material A is prepared from the following components in parts by mass: 15-20 parts of intermediate transferring chain, 1-3 parts of catalyst and 720-780 parts of water; the material B is prepared from the following components in parts by mass: 200-250 parts of unsaturated sulfo intermediate and 450-500 parts of water; the polycarboxylate retardant pumping aid has a water-reducing rate of up to 18-35% and can improve strength of concrete at all stages significantly, has the ratio of compressive strength for 3-7 days of about 130-150% and can improve the ratio by 20% for 28 days; the polycarboxylate retardant pumping aid has good pumping performance, has the net increased slump of no less than 100 mm and slump loss rate in 2 h of less than 20%, and can be used for preparing self-leveling and vibration free concrete; the polycarboxylate retardant pumping aid improves flowability of concrete significantly, improvesconstruction performance, delays peak of heat release of cement hydration, helps to avoid cold joints in construction bonds, and effectively improves crack-resistance and seepage control performance.

Description

technical field [0001] The invention relates to a polycarboxylic acid retarding high-efficiency pumping agent and a preparation method thereof, belonging to the field of concrete admixtures. Background technique [0002] Polycarboxylate Superplasticizer (Polycarboxylate Superplasticizer) is a high-performance water reducer and a cement dispersant in the application of cement concrete. Widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects. According to the difference of the main chain structure, the polycarboxylate high-efficiency water reducer products can be divided into two categories: one is acrylic acid or methacrylic acid as the main chain, grafted with polyethers of different side chain lengths. The other is a polyether with maleic anhydride as the main chain grafted with different side chain lengths. Based on this, a series of high-performance water reducer products with different characteristics have been derived. Existing polycar...

AI Technical Summary

Problems solved by technology

The existing polycarboxylate superplasticizers generally aim at high water reduction, but they often damage the fluidity of concrete and introduce a large number of air bubbles, which cannot meet the needs of pumping concrete