石屎（粵拼：sek6 si2，有人寫做石矢），或者叫做混凝土（粵拼：wan⁶ jing⁴ tou²），係種由英泥、沙石及水混合而成嘅建築材料；撈啲其他化學品入去，可以得出特質稍異嘅製成品。[1][2][3][4]
添加劑有：膠結性粒料骨材、化學快乾劑、緩凝劑、引氣劑、塑化劑、強塑劑……
參考
睇埋
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