Self-compacting C70 concrete and preparation method thereof

Abstract

The invention relates to the field of concrete, and particularly discloses self-compacting C70 concrete and a preparation method thereof. The self-compacting C70 concrete is prepared from a concrete mixture. The concrete mixture comprises the following components: water, cement, mineral powder, sand, stone, sodium methallyl sulfonate, calcium lignin sulphonate, aminobenzene sulfonic acid, sorbitol and methyl cellulose ether. The preparation method comprises the following steps of: (1) well mixing cement, mineral powder, sodium methallyl sulfonate, calcium lignin sulphonate, aminobenzene sulfonic acid, sorbitol and methyl cellulose ether to obtain a premix; (2) adding sand and stone into the pre-mixture, and mixing well to obtain a mixture; (3) adding water into the mixture, and mixing well to obtain a concrete mixture; and (4) pouring the concrete mixture into a template, and carrying out maintenance and demolding to obtain the self-compacting C70 concrete. The concrete mixture can reduce early shrinkage of concrete.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a self-compacting C70 concrete and a preparation method thereof. Background technique [0002] Self-compacting concrete means that it can flow and compact under the action of gravity by itself, and in the case of a dense steel mesh structure, it can also completely fill the formwork and obtain better homogeneity, and there is no need to Vibration compacted concrete material. [0003] Since self-compacting concrete does not need to vibrate, it reduces the micro-watering phenomenon produced by the vibrating rod when it vibrates, which makes the performance of the prepared concrete material better, and the operation is more convenient. It is a better substitute for ordinary concrete. [0004] However, the existing self-compacting concrete has a low water-to-binder ratio and a high amount of cementitious material, which makes the early shrinkage of the concrete larger, especially the early s...

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Problems solved by technology

[0004] However, due to the low water-to-binder ratio of existing self-compacting concrete and the high amount of cementitious materials, the early shrinkage of the concrete is relatively large, especially the early self-shrinkage, which makes the self-compacting concrete prone to cracks, thereby affecting the watertightness of the concrete material. In particular, the decrease of water tightness will make it easier for water to erode the interior of the concrete, resulting in poor durability of self-compacting concrete, so there is still room for improvement

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