石灰石中经常含有少量的氧化镁，这对水泥的安定性有害。
Limestone often contains small amount of magnesium oxide that is harmful to soundness of cement.
轻烧氧化镁掺量越大，水泥砂浆的膨胀率越大。
The more the magnesia replaces the cement, the greater expansion rate of the cement mortar is.
夹心板主要由钢丝及轻烧氧化镁、粉煤灰或者膨胀珍珠岩，再加水泥、粘结剂、发泡剂混合搅拌发泡成一整体。
The sandwich boards are mainly mixed, foamed, and integrated with steel wires, light burning magnesium oxide, fly ash or expanded pearlite, cement, adhesives, and foaming agents.
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