Preventive Measures Against Concrete Surface Dusting and Sanding

1.原材料 control is essential. Strictly prohibit the use of cement with a storage period exceeding 3 months, including expired and dampened cement lumps. All incoming cement must undergo inspections for the manufacturer, name, test reports, factory certification, and on-site sampling stability test reports before being approved for use. During construction, opt for ordinary portland cement with high hydration heat and good frost resistance as much as possible, which is beneficial for winter construction and effectively prevents early ground freezing. It also has advantages such as good water retention, low shrinkage, and particularly high early strength, which are highly favorable for ensuring ground quality and construction progress.

2. Aggregate Selection: It is crucial to strictly prohibit the use of fine sand in floor mortar or fine aggregate concrete toppings, as fine sand is prone to shrinkage and has poor water retention, which is不利于 the smoothing of the ground surface. Medium to coarse sand should be used instead, with a silt content not exceeding 3%. This type of sand outperforms fine sand in both strength and wear resistance. The water-cement ratio of cement mortar should be strictly controlled and adjusted according to the construction mix ratio and on-site environmental conditions. This is one of the key factors affecting the sanding of floor surfaces.