A kind of self-compacting concrete and preparation method thereof

Abstract

The invention belongs to the field of building materials, and particularly relates to self-compacting concrete and a preparation method thereof. The self-compacting concrete is prepared from, by weight, 200-325 parts of Portland cement, 100-135 parts of active admixture, 1350-1600 parts of aggregate, 8-15 parts of naphthalene-based superplasticizer and 150-190 parts of water; wherein the active admixture is an activated product obtained by calcining Bayer process red mud and coal gangue at 600-700 DEG C for 1-2 hours. According to the invention, the clay rock gangue, calcareous rock gangue andBayer process red mud are calcined at a certain temperature to obtain an active admixture; the goal of simultaneously activating the clay rock gangue and the Bayer process red mud is achieved; when the active admixture is added into self-compacting concrete, the strength and frost resistance of the self-compacting concrete can be remarkably improved, and the shrinkage performance of the self-compacting concrete can be improved, so that the possibility of cracking of the concrete is reduced, and excellent frost resistance and shrinkage performance can be obtained without adding an air entraining agent and an expanding agent.

Description

technical field [0001] The invention belongs to the technical field of building materials. More specifically, it relates to a self-compacting concrete and its preparation method. Background technique [0002] Self-compacting concrete ((Self Compacting Conctete or Self-Consolidating Concrete referred to as SCC) means that under the action of its own gravity, it can flow and compact, even if there are dense steel bars, it can completely fill the formwork, and at the same time obtain good homogeneity without additional Vibrating concrete has the following advantages: it can ensure that the concrete is well compacted; it can improve production efficiency; it can improve the working environment and safety. It can increase the freedom of structural design; Concrete has very limited durability after hardening, especially in cold climates; at the same time, drying shrinkage is slightly greater compared to ordinary concrete. [0003] Red mud is industrial solid waste that is discha...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the existing self-compacting concrete, such as the large amount of red mud blended in the Bayer process and the excessively long final setting time of the concrete, and provide a self-compacting concrete with good mechanical properties and small shrinkage. self compacting concrete

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