Early strength type polycarboxylic acid water reducing agent for C80 pipe pile concrete

Abstract

The invention provides an early strength type polycarboxylic acid water reducing agent for C80 pipe pile concrete, wherein 1000 parts of the polycarboxylic acid water reducing agent are prepared fromthe following components by weight: 331-344 parts of a polyether macromonomer with a molecular weight of 3500-3800, 27-34 parts of acrylic acid, 4-10 parts of an amide-based small monomer, 4-10 partsof a rigid small monomer, 2-6 parts of 27.5% industrial-grade hydrogen peroxide, 2-5 parts of unsaturated sulfonate, 0.4-1.5 parts of a reducing agent, 1.8-2.4 parts of a chain transfer agent, 6-12 parts of a neutralizing agent, and the balance of water, wherein the prepared finished product has a mass fraction of 40%, and an acid-to-ether ratio is controlled at 4.3-4.8. According to the present invention, the water reducing agent molecule having the long main chain and the long branched chain is obtained by matching the amine ether macromonomer and the polyether macromonomer according to a mass ratio of 7:2, and the rigidity of the main chain can be strengthened by introducing the rigid small monomer, such that the main chain shape change caused by the too large steric hindrance of the side chain can be avoided, and the good anchoring effect of the water reducing agent molecule on the surface of the cement particles can be ensured.

Description

technical field [0001] The invention relates to the technical field of building materials and concrete admixtures, in particular to an early-strength polycarboxylate water reducer for C80 pipe pile concrete. Background technique [0002] In recent years, with the continuous expansion of urban construction and traffic construction, the demand for prefabricated pipe pile components is increasing. Different from ordinary-strength concrete used in general buildings, pipe pile components have higher requirements on concrete strength according to their structural characteristics and use environment, and are generally prepared with C80 pipe pile concrete. [0003] C80 pipe pile concrete belongs to high-grade concrete, and the standard range of water-binder ratio is 0.26-0.28, which makes the viscosity of the concrete very high. C80 concrete, which is usually used to make pipe pile components, needs very good dispersion, that is, the whole mixing The object system should be very un...

AI Technical Summary

Problems solved by technology

Since the water-binder ratio of C80 pipe pile concrete is 0.26-0.28, the viscosity of the mixture system is very high, and it is difficult to mix evenly

The ordinary polycarboxylate water reducer prepared by the existing technology cannot achieve a good dispersion effect in the C80 pipe pile concrete, which hinders the actual construction operation process

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