Fast acting restorer for preventing slump loss in pumped concrete

Abstract

The invention discloses a quick-acting restoring agent for preventing slump loss of pump concrete. The quick-acting restoring agent is characterized by being prepared from the following raw materials in percentage by weight as follows: 95%-99% of a polycarboxylic acid type superplasticizer, 1%-5% of a sugar-calcium retarding admixture, 0-0.1% of an air entraining agent and 0-0.1% of a defoamer. Under the condition that the pump concrete fails to meet the requirement of the in-pump slump, the restoring agent accounting for 0.07%-0.148% of the weight of a cementing material in the pump concrete is mixed in the pump concrete, the mixture is evenly mixed and then put into use, the pump concrete can be restored rapidly to meet the requirement of the in-pump slump, and the compressive strength of the pump concrete can be prevented from being reduced, accordingly, technical problems of the current pump concrete in application are effectively solved, the quality of the pump concrete is guaranteed, and good economic benefits and social benefits are realized.

Description

Technical field: [0001] The invention relates to a quick-acting recovery agent for preventing the slump loss of pumped concrete, belonging to the field of pumped concrete admixtures. Background technique: [0002] There are currently two major types of main materials for preparing pumping concrete pumping admixtures: naphthalenesulfonic acid formaldehyde condensates (called naphthalene series) and polycarboxylate superplasticizers (called polycarboxylates). The advantage of naphthalene series is low cost, and the disadvantage is that it will emit harmful gas when it condenses with formaldehyde during production, and its adaptability to some cements is not ideal; while polycarboxylate high-efficiency water reducers just make up for the defects of naphthalene series water reducers : It does not pollute the environment during production, and has good adaptability to various cements. Therefore, polycarboxylate high-efficiency water reducers are mostly used in the field of pumpi...

AI Technical Summary

Problems solved by technology

[0010] It can be seen from Table 2 that: adding water before entering the pump increases the water-cement ratio to 0.05, and although the slump can meet the requirements, the compressive strength of the concrete will decrease by 20%.

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