A kind of concrete and preparation method thereof

Abstract

The invention discloses a concrete and a preparation method thereof, belongs to the technical field of building materials, and solves the problem that the concrete hardens unavoidably after long-term transportation. Concrete comprises 100-150 parts of adhesive material; 250-800 parts of aggregate; 30-105 parts of water; 0.1-0.9 parts of retarder; the cement is cement, and the retarder comprises a ratio of 1 by weight and number: (0.1 ‑0.8) starch and acids; the acids are composed of organic acids and inorganic acids with a weight ratio of (0.7‑2): 1, and the organic acids are one or more of hydroxycarboxylic acids and aminocarboxylic acids , the organic acid is one of hydrochloric acid, sulfuric acid, and phosphoric acid; the degree of crosslinking of the starch is 5%-15%, and the amylopectin in the starch accounts for 70%-90% of the total weight of the starch. The invention achieves the effects of retarding the setting and adjustable retarding time through the retarding of the starch and the hydrolysis of the acids.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to concrete and a preparation method thereof. Background technique [0002] Concrete, referred to as concrete for short, refers to the collective name of engineering composite materials in which aggregates are cemented into a whole by cementitious materials. The term concrete usually refers to the cement concrete obtained by mixing cement as the cementitious material, sand and gravel as the aggregate, and water (may contain admixtures and admixtures) in a certain proportion. The hydration reaction between water and cement occurs, and the clinker minerals in the cement and water form gel and metal hydroxide, and the gel wraps the aggregate; in the process of water evaporation and hydration reaction, the concrete is gradually completed hardening. [0003] After the concrete components are mixed, the hydration reaction of cement and water and the evaporation of water will ...

AI Technical Summary

Problems solved by technology

However, in actual situations, some concrete needs to be transported for a long time in the concrete mixer truck; although there is a mixing device in the concrete mixer truck to continuously mix the concrete, the mixing capacity of the mixing device is limited, and the mixing device does not It is possible to take care of the concrete of each part. Once the transportation time is too long, it is inevitable that the concrete will harden

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