1.Environmental and climatic reasons

In spring, the temperature difference between day and night is large, and the temperature of concrete poured at the same time varies greatly in different time periods. The temperature difference between inside and outside of concrete is also large, which is easy to form temperature shrinkage crack.In this season, the air is dry, the humidity is small, and the wind force is generally at level 4 ~ 5. The wind force is greater on the floor of the open construction site, and the water loss on the surface of the freshly poured concrete is faster, which is easy to form the shrinkage crack of wind-dried plastic.

2. Construction reasons

In the construction blindly requests the big slump to facilitate the construction, little does not know the slump produces the crack the probability to be also bigger bigger bigger, plus in the construction receives the light not to be prompt, receives the light to be early, or receives the light times slant little;Construction and maintenance is not in place, more likely to form shrinkage cracks.Due to the investor or other reasons, the requirements of the short construction period, resulting in the floor load or early removal of mold, concrete pouring less than 24h began to lift steel tube steel and formwork, etc., in the removal of side wall panels and the process of lifting and placing materials, vibration is too large or stacked too concentrated, easy to form destructive cracks.

3. Raw material control

In terms of material, sand silt slants big, concrete cohesive force is insufficient, admixture quality is not stable, especially with Ⅲ grade fly ash as Ⅱ, easy to form shrinkage crack.

4. Mix design

In the aspect of mix proportion design, the amount of cement and admixture amount is too much, slump is too big, concrete shrinkage is large, admixture content is too much, concrete setting time is too long, easy to form shrinkage crack.

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