Method for testing adaptability of polycarboxylic water reducer and cement

Abstract

The invention discloses a method for testing the adaptability of a polycarboxylic water reducer and cement. The method comprises the following steps of: proportioning according to a ratio of each raw material in concrete during the actual construction; blending mortar by using a cement mortar blender, and detecting the mortar by using a device for testing the adaptability of the polycarboxylic water reducer and the cement; and evaluating the workability of the mortar according to the time that the detected mortar overflows from a mortar funnel completely and the extensibility of the mortar ona glass plate so as to determine the adaptability of the polycarboxylic water reducer and the cement. The method has the advantages of simplicity, convenience of operation, accurate measuring, strongrelevance with the workability of the concrete and comprehensive reflection on the adaptability.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a method for testing the adaptability of a polycarboxylate water reducer and cement. Background technique [0002] Polycarboxylate superplasticizer is a new type of high-efficiency superplasticizer, known as the third generation of high-performance superplasticizer. It has the advantages of high water-reducing rate and good slump-preserving effect. It is more and more used in high-efficiency In concrete with fluidity and high slump retention, polycarboxylate superplasticizers also have problems such as poor adaptability to cement, easy bleeding, and bottom formation. This seriously affects the workability of fresh concrete. Among them are the problems of the polycarboxylate superplasticizer itself, and there are also factors of cement differences. There are many brands of cement on the market, and the quality of each is uneven. Even the cement produced by different factories of the same...

AI Technical Summary

Problems solved by technology

This has disadvantages: the slump can only reflect the yield stress of the mixture one-sidedly; it is not clear what the slump fluidity reflects; it is also subjective to determine other workability of concrete by visual inspection. experiential

Micro-slump test and mortar consistency test are related to mortar viscosity and yield stress, but they have different emphases, and the direction of the workability of the concrete they represent is also different, which cannot fully reflect the workability of mortar

The correlation between the table jumping experiment and the workability of fresh concrete is not strong, and it cannot reflect more aspects of adaptability

Rotational viscometers have high requirements for test conditions and test operations, and the test range is also narrow, which is difficult to meet the needs of practical applications

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