I have seen manhole covers in cities, among which cement manhole covers are the most common. How to improve the strength and firmness of cement manhole covers?
Ways to improve cement strength in a short time
1. Use early-strength cement.
2. Early strengthening agent.
3. Increase the early curing temperature (but pay attention to moisturizing, otherwise it is easy to produce cracks).
4. Increase the amount of cement while reducing the water-cement ratio.
Ways to improve firmness
1. Increase the amount of cement while reducing the water-cement ratio.
2. Appropriately increase steel bars to improve the resistance of the manhole cover.