Water reducing agent for road bridge prefabricated concrete and production method thereof

Abstract

The invention discloses a water reducing agent for a road bridge prefabricated concrete and a production method thereof. The method comprises the following specific steps: step 1: preparing polyvinylalcohol monomethyl ether, unsaturated sulfonate, melamine resin, formaldehyde, methacrylic acid, sodium nitrite, concentrated sulfuric acid and water for standby; step 2: adding polyvinyl alcohol monomethyl ether and methacrylic acid weighed in step 1 to a reaction vessel, heating the material to 135 to 145 DEG C by an electric heater, and uniformly stirring the material by an electric stirrer; step 3: cooling the product obtained in the step 2 to 100-120 DEG C, and adding water and melamine resin and rapidly stirring the materials by the electric stirrer to obtain a hydrolyzate; and step 4: adding the hydrolyzate obtained in the step 3 to a No. 2 reactor, cooling the material to the temperature of 70-85 DEG C, and adjusting the pressure to 2.5- 3 MPa. The water reducing agent can effectively improve the Van der Waals force between the particles on the entire concrete surface to become the dominant force, increases the slump of the concrete, and enhances the mildew resistance of the water reducing agent.

Description

technical field [0001] The invention belongs to the technical field of production methods of water reducing agents, and in particular relates to a water reducing agent for prefabricated concrete of highway bridges and a production method. Background technique [0002] With the rapid development of the concrete industry, the use of concrete admixtures to improve the performance of concrete has gradually attracted people's attention. Polycarboxylate superplasticizer is a research hotspot at home and abroad in recent years. It has many unique advantages in the application of concrete. For example, it can make concrete have good fluidity when the content is low; It has low viscosity and relatively good slump retention, etc. However, the anti-mildew properties of water reducing agents currently on the market are not significant, and cannot greatly improve the strength of concrete at all ages, and are suitable for all types of concrete. Contents of the invention [0003] The p...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a water reducer for precast concrete of highway bridges and its production method, to solve the problem that the water reducer on the market currently has no significant anti-mildew performance and cannot greatly improve the age of concrete. The strength, suitable for all kinds of concrete problems