Polycarboxylate concrete water reducing agent adapted to machine-made sand and preparation method of polycarboxylate concrete water reducing agent

Abstract

The invention provides a polycarboxylate concrete water reducing agent adapted to machine-made sand and a preparation method of the polycarboxylate concrete water reducing agent. The method comprisesthe steps that after macromonomer methylallyl alcohol polyoxyethylene ether, water and an initiator sodium hydrogen sulfite are stirred to be completely dissolved, heating is performed to increase thetemperature to 55-70 DEG C, then crylic acid, an aqueous solution of high surface active monomer 2-acrylamidedodecylsulfonic acid and an aqueous solution of the initiator sodium persulfate are addeddropwise, and adding dropwise is performed for 2-3 h; heat preservation is performed for 2-3 h after adding dropwise is completed, after cooling is performed to the indoor temperature, organic alkaliis used for neutralizing and adjusting the pH value to 6-7, and the polycarboxylate concrete water reducing agent adapted to the machine-made sand is obtained. The novel polycarboxylate concrete waterreducing agent has wettability to the machine-made sand, can also obviously improve the air entrainment effect, workability, wrapping and early strength of concrete, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of construction engineering materials, in particular to a polycarboxylate concrete water reducer suitable for machine-made sand and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is an essential additive in concrete application. Polycarboxylate superplasticizers are widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects. It is environmentally friendly, non-flammable and non-explosive. With the continuous consumption of high-quality sand and gravel resources in our country, the use of machine-made sand is an inevitable trend. Machine-made sand is made of rocks through mechanical crushing. The sources, equipment and processes of machine-made sand are different across the country, resulting in machine-made sand. Chemical composition, particle shape, particle gradation, and ultrafine particle content are all different from natural s...

AI Technical Summary

Problems solved by technology

Introducing silicone coupling agent and lignosulfonate as wettability components in the synthesis of polycarboxylic acid has good water retention and cohesion in concrete, especially machine-made sand concrete, but the silicone component is not very good. It is good to improve the wrapping and wettability of water reducing agent on sand and gravel

CN108409193A discloses a preparation method of machine-made sand C120 ultra-high-strength concrete polycarboxylate admixture, the admixture contains water-reducing polycarboxylate water-reducer, viscosity-reducing polycarboxylate water-reducer, retarder, Foaming agent and other components can effectively improve the machine-made sand ultra-high-strength concrete due to the poor gradation of the machine-made sand itself and the poor particle shape. Problems such as low fluidity and poor pumpability can meet the requirements of pumping construction for super high-rise buildings, but have limited effect on improving wettability and early strength

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