Self-compacting concrete and its preparation technology

Abstract

The invention discloses a self-compacting concrete and a preparation process thereof. The self-compacting concrete comprises the following components in parts by weight: 130-150 parts of water, 170-200 parts of cement, 90-100 parts of fly ash, 50-70 parts of phosphorus slag powder, 10-30 parts of lithium slag powder, 20-40 parts of limestone powder, 850-870 parts of medium sand, 900-950 parts of gravel and 5-7 parts of an additive. The use of the phosphorus slag powder and the lithium slag powder can reduce the amount of cement, saves the cost, and is green and environment-friendly; the polycarboxylate slump retaining agent and the polycarboxylate water-reducing agent act together, and the phenomena of " bottoming" and "hardening" of the concrete mixture can be effectively overcome; and the anti-permeability performance of the concrete can be improved by adding the metallocene polypropylene; the addition of dry ice particles added during concrete preparation can reduce the temperatureof the concrete mixture, and on the other hand, the dry ice particles can promote the dispersion of all the components of the concrete; and when the concrete is prepared, the defoaming agent added inthe concrete can reduce harmful holes in the concrete, and the formed concrete is flat after being paved.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a self-compacting concrete and a preparation process thereof. Background technique [0002] In the concrete construction process, the cast-in-place concrete is usually pumped and compacted by vibrating with a hand-held vibrating rod. However, for 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 self-compacting concrete to meet the needs. Self-compacting concrete refers to concrete that can flow and compact under its own weight, and can be completely filled even in the presence of dense steel bars, and has good homogeneity and does not require additional vibration. [0003] However, the preparation cost of self-compacting concrete is relatively high. Compared with the mix ratio of ordinary concrete, the amount of cementitious materials is large, and the amount of ceme...

AI Technical Summary

Problems solved by technology

[0003] However, the preparation cost of self-compacting concrete is relatively high. Compared with the mix ratio of ordinary concrete, the amount of cementitious materials is large and the amount of cement is relatively high.

The high cost of self-compacting concrete has greatly restricted the popularization and application of self-compacting concrete

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