1.水灰比过大：即拌合的混凝土水量大，导致混凝土表面泌水，降低混凝土表面强度。
1. The water cement ratio is too large, the mixing of concrete quantity is big, lead to concrete surface exudation, reduce the concrete surface strength.
2.砂石料的级配不合理、含泥量高：骨料级配不合理、过细的土砂也易导致地面起砂，影响水泥的早期水化及混凝土的凝结。
2. The application of grading is not reasonable, high silt content: aggregate grading is not reasonable, superfine sand soil is easy to cause the ground sand, influence the early hydration of cement and concrete condensation.
3.施工过程中的过分振捣：加剧混凝土表面的泌水，导致混凝土表面强度较低。
3. The excessive vibration in the process of construction: concrete surface exudation, and leads to lower the concrete surface strength.
4.养护不当：未能及时养护或养护不充分，暴晒或大风导致混凝土表面大量失水，表面得不到充分水化，导致强度较低。
4. Improper maintenance: failed to inadequate maintenance or maintenance, the sun or wind lead to concrete surface water in great quantities, the surface is not fully hydrated, leading to a lower intensity.
5.其它原因：压光时间掌握的不好、混凝土表面未达到一定的强度就上人作业、低温下施工混凝土表面受冻等。
5. Other reasons: calender time grasp is not good, and the strength of the concrete surface do not meet certain people work construction concrete surface, low temperature cold, etc.

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