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Construction of sand-free concrete
Mixing of concrete
The mixing of sand-free concrete generally uses the same mechanical mixing method as that of ordinary concrete. Due to the consistency of the cement slurry Larger and smaller quantities, in order to ensure that the cement slurry can be evenly wrapped on the aggregate, forced mixing should be used.
Formwork Engineering
The concrete side pressure of sand-free concrete is smaller, generally that of ordinary concrete, so it can Use various light formworks such as wood formwork, plywood formwork, steel wire mesh formwork, etc.
Pouring of concrete
Since the amount of cement in sandless concrete is limited and can only wrap aggregate particles, it is not suitable to vibrate vigorously during the pouring process. Otherwise, the cement slurry will be deposited and destroy the uniformity of the concrete structure.
The density of sand-free concrete should use the smallest density tools. During construction, it is usually sufficient to lightly tap the outside of the formwork with a carpenter hammer.
/>Concrete maintenance
Sandless concrete dries quickly due to the existence of pores, so maintenance is very important to prevent a large amount of concrete moisture from evaporating. When encountering hot sun and windy weather, it should be covered with water or calcium chloride should be used to promote setting. Condensation.
Conclusion Sand-free concrete has the advantages of concrete such as convenient shape, solidity and durability. The presence of pores inside makes it show different characteristics from ordinary concrete. Small bulk density, large water permeability, large capillary action, small cement consumption and less construction. Convenience, etc. Because of these characteristics, it has various application types in road and bridge projects.
However, when applying sand-free concrete, we should also see that its weakness is that although its bulk density is small, its strength is greatly reduced. Although the amount of cement is small, the adhesion force is reduced. In addition, when considering the recycling of sand-free concrete, it should also be considered that the sharp-edged crushed aggregate may cause local damage under load. In short, the practical application of sand-free concrete has its The application type and mix ratio should be analyzed and determined based on the characteristics of the specific structure.