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今年5月24日，三峡大坝最后一仓混凝土（成分中含有氧化钙）开始浇筑，为防止浇筑过程中混凝土水化放出的热量使坝体温度升高，技术人员在仓内埋设了许多管道，一旦温度升高,则通水冷却。下列说法不正确的是……………………………………（ ）

A．混凝土的水化过程包含化学变化 B．混凝土是混合物

C．混凝土的水化过程中吸收热量 D．钢筋混凝土是复合材料