Method for testing adaptability of polycarboxylic water reducer and cement

A technology of water reducing agent and polycarboxylic acid, applied in the field of concrete, can solve the problems of unclear what the slump fluidity reflects, the direction of concrete workability is different, and it is difficult to meet the needs of practical applications, etc. Simple rheological properties, labor saving, simple method effect

Active Publication Date: 2011-02-23
ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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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

Method used

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  • Method for testing adaptability of polycarboxylic water reducer and cement
  • Method for testing adaptability of polycarboxylic water reducer and cement

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[0034] (1) Determine the mortar mix ratio according to the amount of cementitious material, sand, water and polycarboxylic acid water reducer in the actual construction coagulation mix ratio, and use the actual construction cementing material used in the actual construction and the actual construction after 5mm screen screening Use sand to formulate polycarboxylic acid water reducing agent; see Table 1 for the specific mixing ratio

[0035] Table 1 Specific implementation mortar mix ratio

[0036] material

[0037] Dosage / g

[0038] (2) Use a cement mortar mixer to mix the mortar, and the mixing process: add 6.2g of polycarboxylic acid water reducing agent to 228g of water, then pour the water into the mixing pot, and then pour 616g of cementitious material and 1080g of sand In the stirring pot, first stir slowly for 60 seconds, then stir quickly for 30 seconds, intermittently for 90 seconds, and then quickly stir again for 60 seconds;

[0039] (3) Use a device to test the ada...

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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...

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Application Information

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IPC IPC(8): G01N33/38G01N33/00G01N11/00C04B24/24
Inventor 黄玉华汪志勇黄海李龙周春娥陈娟
Owner ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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