Generally speaking, there is no problem, and the thermal expansion coefficient of the pipeline cannot rise to the point where cement can't bear it.

Wrap the sewer pipe directly with cement, and then paste tiles to save space.

Advantages: This is equivalent to wrapping the pipeline with sand, which will be well protected and help save space.

Disadvantages: When the pipeline wrapped in sand mixture leaks or needs to open the inspection port on the pipeline, it is almost impossible to peel the pipeline from the sand mixture. Heat expands and contracts, and the pipeline bursts beyond repair. Therefore, this issue still needs to be considered by the owners themselves.

Thermal expansion coefficient refers to the relative percentage of sample volume change before and after heat treatment, which is suitable for solid samples with small expansion performance. Its essence is the same as the expansion multiple, but its expression is different.

Thermal expansion coefficient = (volume after heating-volume before heating)/volume before heating * 100%.