Polypropylene fiber coral concrete and preparation method thereof

Abstract

The invention discloses polypropylene fiber coral concrete and a preparation method thereof. The concrete is composed of coral concrete and polypropylene fibers, wherein the coral concrete is in C30 grade and comprises the following components per cubic meter: 405kg of cement, 45kg of coal ash, 830kg of medium sand, 716kg of coral, 180kg of seawater and 4.5kg of water reducing agent; the polypropylene fibers are unifilar bunchy short fibers and respectively 19mm in length; the tensile strength of the polypropylene fibers is greater than 500MPa. The preparation method comprises the following steps: pouring the sand and the coral into a stirrer for stirring; adding the polypropylene fibers and performing dry stirring evenly; then adding one half of seawater and stirring; and finally, adding the cement, the coal ash, the water reducing agent and the rest of seawater and evenly stirring so as to obtain the polypropylene fiber coral concrete. The polypropylene fiber coral concrete is excellent in splitting tensile strength and rupture strength, and is good in toughness, crack resistance and permeability resistance at the same time. In addition, the polypropylene fiber coral concrete has the advantages of light weight, low cost and the like, and can be prepared by utilizing local materials. Thus, the maintenance of maritime rights and interests and the development and the utilization of marine resources are facilitated. As a result, the polypropylene fiber coral concrete accords with requirements of the maritime strategy in China.

Description

technical field [0001] The invention belongs to the technical field of building engineering materials, and in particular relates to a polypropylene fiber coral concrete and a preparation method thereof. Background technique [0002] With the development of the ocean and the competition for marine rights and interests, marine engineering construction including military protection is increasing day by day. For the construction of islands and reefs far away from the mainland, under the premise of not destroying the local ecological environment, coral reefs are used instead of coarse aggregates. Coral concrete prepared from seawater instead of freshwater has great practical significance in civil engineering and military engineering. Compared with ordinary concrete, coral concrete is lighter in weight, and has the advantages of strong anti-seepage and crack resistance, good heat insulation effect, strong anti-freezing and anti-fatigue ability, and good durability. The essential ...

AI Technical Summary

Problems solved by technology

Compared with ordinary concrete, coral concrete is lighter in weight, and has the advantages of strong anti-seepage and crack resistance, good heat insulation effect, strong anti-freezing and anti-fatigue ability, and good durability. Essential shortcomings such as low modulus, easy cracking, and high chloride salt content limit its development and application