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Measures to prevent cracks in concrete

times   2016-07-06

Measures to prevent cracks in concrete. The raw material dumps erection pergola, watering and other measures to reduce the temperature of the coarse aggregate, concrete mixing time increases.

Preparation of mass concrete using low heat of hydration of cement, to set the temperature measuring device, and to take measures to ensure that the insulation inside and outside temperature is less than 25 ° C. Strictly control the concrete mix, determined in accordance with the ratio of concrete strength and workability of concrete and quality inspection requirements, and strictly control the amount of water and cement. Choose well-graded coarse aggregate, reduced porosity and sand ratio in order to reduce shrinkage, improve the strength of concrete cracking.

To attach great importance to the conservation of the concrete structure. Different conservation, the cracking resistance of concrete structures can exponentially change, so in a timely manner after the pouring of concrete cover maintenance, increase humidity. Especially for vertical structure, maintenance is equally important, the use of double-sided rod hanging over the sacks, and watered regularly moist is a good conservation methods.

In concrete meet pumpability, workability of the machine to minimize the problem before the slump, to reduce the rate of sand, strict control of aggregate clay content, blending fly ash mixed villages, such as cracks in the concrete a second wiping surface before the final setting, and timely watering and coverage.

Before pouring the concrete, grass-roots should be first soaked and templates watering, avoid excessive absorption of water in the pouring process should try to be both sufficient and avoid excessive vibration. Strict construction procedures, do not blindly rush. Prevent premature upload, and load on early form removal. By configuring through a long steel mesh on the inner surface layer on both sides of the beam, bearing withstand negative moment, to avoid cracks due to uneven settlement generated.

Currently on the construction market, building authorities, the owners of the construction progress of the project and more stringent quality requirements, the construction unit in order to meet the requirements of owners, the quality of concrete pouring construction must be observed and controlled.

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