Low-slump-loss concrete pumping agent

Abstract

The invention belongs to the technical field of concrete additives, and particularly relates to a low-slump concrete pumping agent, which is made of the following raw materials in parts by weight: 28-46 parts of calcium lignosulfonate, 10-22 parts of methyl cellulose, and potassium tartrate 10-16 parts of sodium, 5-11 parts of dodecyl betaine, 1-7 parts of hydroxyethylidene diphosphonic acid, and 1-7 parts of tributyl phosphate. The low-slump-loss concrete pumping agent of the invention has high slump-retaining properties, does not crystallize in normal use at 0°C or even lower temperatures, has strong adaptability to cement, adapts to different cement varieties, and has good fluidity.

Description

technical field [0001] The invention belongs to the technical field of concrete additives, in particular to a low-slump concrete pumping agent. 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 increa...

AI Technical Summary

Problems solved by technology

In addition, since the concrete in the mixing plant is transported from the mixing plant to the construction site by concrete mixer trucks, once the traffic is blocked or the road is far away, the mixed concrete will take too long, and the fluidity will be seriously lost and cannot be pumped.

[0003] Generally, concrete is poured by pumping at the construction site, so the concrete needs to have good fluidity and pumpability. However, most of the water-based concrete pumping agents currently on the market use single-component water reducing agents and retarders. It is formulated, so there are the following disadvantages: poor adaptability of cement, usually only suitable for a few cement varieties, poor fluidity, precipitation of crystals (the composition is Na2SO4 or CaSO4) and precipitation under low temperature conditions in winter, causing pipeline blockage and cannot be used normally. At the same time, the quality is extremely unstable and the slump loss is fast