引起工厂地面起灰大致原因：
The main causes of ash on the factory floor are as follows:
1、在干燥环境条件下施工时，未对模板或基层用水湿润，造成混凝土表面失水过快，影响了水泥正常水化，使强度降低。
1. During construction under dry environment, water is not wetted to the formwork or base, which results in excessive water loss on the surface of concrete, affects the normal hydration of cement and reduces its strength.
2、未掌握到压光时机，压光过早或过晚均会造成地面起砂问题。一般在水泥进入初凝阶段进行压光工作。
2. Failure to grasp the timing of calendering, premature or late calendering will cause sand on the ground. In general, calendering is carried out at the initial setting stage of cement.
3、冬季低温浇筑混凝土，未及时保温，使混凝土结构表面早期受冻。
3. Concrete poured at low temperature in winter does not keep warm in time, which makes the surface of concrete structure frozen early.
4、混凝土表面产生泌水，使混凝土表面形成含水量大的砂浆层，而且未及时去除泌水，因此硬化后强度低，完工后一使用就会出现表面起砂现象。
4. The concrete surface produces bleeding, which makes the concrete surface form a mortar layer with large water content, and the bleeding is not removed in time. Therefore, the strength after hardening is low, and the surface sand will appear after the completion of use.
5、混凝土面层未达到足够的强度就上人上车行走，容易破坏表面结构，造成混凝土表面起砂。
5. If the concrete surface layer does not reach enough strength, it will be easy to damage the surface structure and cause sand on the concrete surface.
6、长期的重物车轮碾压，对起砂区域磨损增大。
6. Long-term rolling of heavy-duty wheels increases wear and tear in the sand-lifting area.