A kind of fair-faced concrete and preparation method thereof

Abstract

The invention discloses a fair-faced concrete, which belongs to the technical field of concrete. The key points of the technical solution are: 300-360 parts of Portland cement, 900-1100 parts of coarse aggregate, and 700-760 parts of fine aggregate in parts by weight. 150-210 parts of water, 4-8 parts of admixture and 20-80 parts of modified powder; the modified powder is mixed with nano-silica and micron-sized metal powder in a mass ratio of 2: (0.5-1) In the preferred solution, the modified powder is soaked in polyvinyl alcohol solution and then made into microcapsules by spray drying method, and then added to concrete in the form of microcapsules, which greatly improves the strength and impermeability of concrete and crack resistance. The invention correspondingly discloses a preparation method of fair-faced concrete, which separates and premixes dry materials and wet materials, and then mixes and stirs, which improves the mixing uniformity of concrete, and the prepared clear-water concrete has high strength and impermeability Advantages of good and crack resistance.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a fair-faced concrete and a preparation method thereof. Background technique [0002] Fair-faced concrete (fair-faced concrete) is a concrete that directly uses the natural texture of concrete as a finishing effect, and can be divided into ordinary fair-faced concrete, facing fair-faced concrete and decorative fair-faced concrete. One-time pouring without any external decoration is the two most critical points of fair-faced concrete. [0003] In recent years, fair-faced concrete has been more and more used in industrial and civil construction projects. Its main features are as follows: ① Improve the quality of projects. Fair-faced concrete does not make any modifications, and the quality is "fine, fine and beautiful" in one , the construction process requires a strict division of labor for each process and a dedicated person to be responsible. During constructio...

AI Technical Summary

Problems solved by technology

Its essence is polyester fiber, and its density is much lower than that of cement, river sand, slag and other components in concrete. When mixing concrete, coconut charcoal fibers are prone to aggregation and winding or segregation and delamination with other materials, resulting in coconut charcoal. Fibers cannot be mixed evenly

At the same time, the formula also contains peach gum which has a thickening effect, which can easily make the coconut charcoal fiber bond into a group, which further increases the difficulty of mixing the coconut charcoal fiber

Thereby, this kind of fair-faced concrete is difficult to guarantee to obtain the desired effect in actual production application, and needs further improvement

Images