A self-compacting concrete preparation process and special modified admixture preparation

Abstract

The invention relates to a self-compacting concrete preparation process. Components include, by weight, 160-175 parts of water, 250-260 parts of cement, 115-130 parts of coal ash, 38-45 parts of mineral powder, 1000-1050 parts of medium sands, 800-850 parts of broken stones, 0.5-0.8 part of dispersing agents, 0.01-0.2 part of thickening agents and 7.5-8.0 parts of water reducing agents. Sand-stoneaggregates in self-compacting concrete are the broken stones and the medium sands with small particle sizes, the coal ash, the mineral powder, the cement and the like are mixed with the water to achieve good viscosity, the substances are fine powdery, so that the filling degree is high in casting, and the prepared concrete after curing has fewer surface pores and holes and is high in flatness andlow in roughness. By adding special modified additives, the concrete has good dispersing effects, aggregate and slurry separation is avoided, vibration is omitted in the whole process, and good filling effects are achieved.

Description

technical field [0001] The invention relates to a self-compacting concrete, in particular to a self-compacting concrete preparation process and a special modifier admixture preparation. Background technique [0002] At present, in the concrete construction process, the cast-in-place concrete is usually pumped and compacted by vibrating with a hand-held vibrating rod. However, in the face of large-volume and long-span components, it is impossible to ensure uniform feeding and compact vibration. Therefore, it is necessary to use a More suitable high performance, dense concrete, to meet the needs. Self-compacting concrete refers to the concrete that can flow and compact under its own weight, and can be completely filled even if there are dense steel bars, and has good homogeneity and does not require additional vibration. [0003] Such as the self-compacting concrete disclosed in the Chinese patent with the publication number "CN1762887A". The above-mentioned patent mainly imp...

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Problems solved by technology

At present, most of the concrete on the market is the research on the main parameters such as cement, sand rate, fly ash, etc., but there is very little research on auxiliary ingredients, and the research on auxiliary materials is obviously missing, and the filling of auxiliary materials can affect the self-compacting concrete. Self-compacting performance, filling performance and segregation resistance have been greatly improved