Concrete pumping retarder

Abstract

The invention discloses a concrete pumping retarder, and relates to the technical field of concrete admixtures. The concrete pumping retarder is prepared from, by weight, 40 parts to 50 parts of soybean molasses, 30 parts to 40 parts of isomaltitol, 20 parts to 25 parts of sulfonated melamine, 15 parts to 20 parts of tephra, 15 parts to 20 parts of modified starch, 13 parts to 17 parts of polyacrylamide, 12 parts to 15 parts of fatty alcohol-polyoxyethylene ether, 12 parts to 15 parts of microcrystalline cellulose, 10 parts to 13 parts of fructus gleditsiae powder, 10 parts to 13 parts of tea seed powder, 8 parts to 11 parts of naphthalene water reducers, 6 parts to 10 parts of nanometer rubber powder, 6 parts to 10 parts of polycarbamate, 5 parts to 8 parts of palmitic acid, 15 parts to 20 parts of coconut oil and 300 parts to 400 parts of water. The prepared retarder is free of chloride and alkali, the setting time of concrete can be effectively prolonged, heat of hydration can be reduced, generation and development of temperature cracks of the concrete can be greatly reduced and even avoided, the workability of the concrete can be further obviously improved, the bleeding rate can be greatly reduced, and endurance performance such as freezing resistance and corrosion resistance can be improved.

Description

Technical field: [0001] The invention relates to the technical field of concrete admixtures, in particular to a retarder for concrete pumping. Background technique: [0002] During the building construction process, the concrete needs to be pumped to the designated location for pouring after mixing. During the pumping process, the concrete mixture is required to have the properties of being able to pass through the pipeline smoothly, without clogging, without segregation, and with good viscoplasticity. In order to achieve the smooth pumping of concrete, it is often necessary to add retarders. Most of the retarders have a strong active effect on the surface of cement particles and hydrate new phases, adsorb on the surface of solid particles, and delay the formation of cement and slurry structures. These effects will slow down the hydration rate of cement and prolong the setting time of cement. At present, the retarders used have the disadvantages of poor retarding effect a...

AI Technical Summary

Problems solved by technology

These effects will slow down the hydration rate of cement and prolong the setting time of cement.

At present, the retarders used have the disadvantages of poor retarding effect and unstable setting time control, especially in the summer construction, the concrete is prone to return brine, deformation and low strength.