Rice husks form small cases around edible kernels of rice and are rich in silicon dioxide, an essential ingredient in concrete.
包裹米粒的米糠皮富含二氧化硅，而二氧化硅是混凝土的必要成分。
Cement is the main basic ingredient of ready-mix concrete.
水泥石预拌混凝土最基本的成分。
Because of the specialty of ingredient and production of the ready mixing pumping concrete the probability of producing cracks is higher than non pumping concrete.
由于预拌泵送混凝土配料和制作的特殊性，使得它的裂缝概率高于非泵送混凝土。
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