Low slump loss concrete pumping agent

Abstract

The low slump loss concrete pumping agent has the composition of: naphthalene water reducing agent 35-65 wt%, calcium lignosulfonate 1.0-3.0 wt%, FEA sweller 30-60 wt%, saccharide retarder 1.0-3.0 wt%, sodium gluconate 0.5-4.5 wt% and air entraining agent lower than 0.03 wt%. Adding it in the amount of 3.5-5.0% of cement and other additive at 30-42 deg.c results in concrete solidifying time adjustable in 10-24 hr and 3H slump constant greater than 140 mm pumpable. Its use can avoid cold seam and delayed hydration heat peak. It has important application significence, especially in large volume and large area concrete engineering and concrete conveyance for long distance and at high environment temperature.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures. Background technique [0002] With the development of construction, transportation, hydropower, municipal and other undertakings, there are more and more concrete projects with complex structures and large scales, almost all of which require the use of pumped concrete. Permeation, corrosion resistance and other functions. The pumped concrete is mostly supplied by the mixing station in a centralized manner, and there is a distance to the construction site. It usually takes 30 minutes to 2 hours to transport the concrete to the construction site in cities above the middle level. During this process, the concrete slump is lost, so that it is difficult to or If it cannot be pumped out, the pouring will be interrupted, and the components will leave cold joints, resulting in engineering defects or quality accidents. In summer, the increase in ambient temperature aggravates this slump loss...

AI Technical Summary

Problems solved by technology

At present, new high-efficiency water reducers such as polycarboxylic acid series, sulfamic acid salt series, organic copolymers and graft copolymers are being trial-produced at home and abroad. According to reports, they have good plastic retention and small collapse damage, but no products have yet been released.