backing concrete

• 大体积混凝土

backing concrete的用法和样例：

例句

1. But construction cracks in massive concrete frequently occur, which leads to lower ray-shielding efficiency.
   但大体积混凝土施工中常会产生施工裂缝，以致降低了它防放射作用的效果。
2. It is a difficulty to guarantee the high quality for bulk concrete construction in the high temperature weather.
   在高温天气如何保证要求高的大体积混凝土的施工质量是一个难题。