A retarding water reducer for bored occlusal piles in subway

Abstract

The invention provides a retarding and water reducing agent for an occlusal pile of subway drilling, belonging to the field of retarding and water reducing agents. The retarding and water reducing agent mainly comprises the following components in percentage by mass: 15% to 25% of naphthalene series water reducing agent, 20% to 30% of fatty acid series water reducing agent, 2% to 6% of sodium hexametaphosphate, 3% to 5.5% of sorbitol, 4.5% to 6.0% of citric acid, 2% to 4.5% of maltodextrin, 0.2% of bleed air component and the balance of water. According to the invention, the coagulation time can be controlled freely to reach more than 72 hours through regulation of addition quantity and superposition action of various materials; and simultaneously, the steady increase of concrete intensity can be ensured and the product has good adaptability to various concrete materials.

Description

technical field [0001] The invention relates to a concrete retarding water reducer, in particular to a retarding water reducer for subway bored occlusal piles. Background technique [0002] Contemporary concrete mostly adopts commercial concrete and pumping construction technology. Commercial concrete is also called centralized mixing concrete, that is, the concrete mixed in the traditional on-site construction site is gathered to set up a mixing station, and the concrete mixed by it is transported to On the construction site, the pump truck is used to transport it to the construction level of the building (structure) through the pump pipe. Cement concrete has a setting time limit. Because the mixing station is far away from the construction site, it needs a certain transportation time. If the retarding treatment is not carried out, the concrete will harden and cannot be used even before it is transported to the construction site. When mixing concrete, it is necessary to ad...

AI Technical Summary

Problems solved by technology

Chinese Patent Publication No. CN101215116A discloses a retarded polycarboxylate water reducer, which uses polycarboxylate water reducer as the main component and has a certain air-entraining effect, but the retarded time of the product is longer At the same time, the plastic retention performance cannot meet the construction requirements of drilled occlusal piles; Chinese Patent Publication No. CN101549973A discloses a composite concrete high-efficiency water reducer. Air-entraining agent material composition, the product needs to be heated and stirred externally during the production process, the product cannot meet the construction requirements of drilled occlusal piles in terms of retarding effect, and at the same time, the controllability of the setting time of concrete after 72 hours is not ideal

[0004] In this field, there are many literatures about retarding superplasticizers, but in the construction of subway bored occlusal piles, especially in different seasons, it is necessary to accurately control the setting time of concrete and ensure the stable growth of strength. few