Coral reef sand concrete and preparation method thereof

Abstract

The invention discloses coral reef sand concrete and a preparation method thereof. A cubic meter of the concrete is prepared from the raw materials of 380-420kg of cement, 0-40kg of fly ash, 550-650kg of coral sand, 1150-1250kg of macadam, 4.5-6.5kg of an additive, 0.27-0.39kg of an anti-adsorbent, 35-45kg of additional water, and 180-190kg of net water. The preparation method comprises the following steps of adopting compact piling models comprehensively considering aggregate particle shapes, gradation and concrete working performance, to determine the sand ratio of the concrete under different flowing conditions, and determining the additional water capacity by using water absorption feature points. According to the coral reef sand concrete disclosed by the invention, the defects that the coral reef sand concrete prepared by a conventional method is poor in concrete fluidity and low in strength grade are overcome, and the prepared coral reef sand concrete has the advantages of being high in strength grade, good in fluidity, low in slump loss, not liable to crack, low in unit water consumption, and the like.

Description

technical field [0001] The invention relates to marine concrete, in particular to coral reef sand concrete and a preparation method thereof. Background technique [0002] my country's far-sea islands and reefs are far away from the mainland of the motherland, and there is a lack of materials and fresh water resources. In the construction of these far-sea islands and reefs, the use of traditional building materials not only has difficult maritime transportation tasks and high transportation costs, but also seriously restricts my country's large-scale development of far-sea projects. Construction, management and resource development. In order to solve this problem, it can be considered to make full use of the raw materials around the islands and reefs to construct the islands and reefs. Among them, coral reef sand fine aggregate is used instead of river sand to mix concrete, and some marine concrete structures that do not require reinforcement can be prepared. Such as revetmen...

AI Technical Summary

Problems solved by technology

The current concrete is mainly designed in accordance with JGJ 55-2011 "Ordinary Concrete Mix Proportion Design Regulations" and JGJ 51-2002 "Technical Regulations for Lightweight Aggregate Concrete". The coral reef sand has high water absorption, low density and poor gradation. , and the properties of ordinary river sand are quite different, and the parameters such as sand rate and water-cement ratio obtained by using the "Ordinary Concrete Mix Proportion Design Regulations" for mix design often have a large gap with the actual, which cannot meet the requirements

Because the density of coral reef sand is lower than that of river sand, and the "Technical Regulations for Lightweight Aggregate Concrete" considers the water absorption of aggregates, the existing coral reef sand concrete is mostly prepared according to the "Technical Regulations for Lightweight Aggregate Concrete". When coral reef sand fine aggregate is used instead of river sand to mix concrete, the resulting concrete is still prone to disadvantages such as large unit water consumption, high admixture content, low concrete strength, poor fluidity, large shrinkage, easy cracking, and large slump loss.

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