现有甲乙组成相同的材料,密度为3.00g/cm³,甲材料的绝干体积密度为1500kg/m³,吸水饱和后的体积密度1650g/m³;乙材料吸水饱和后的体积密度为1800kg/m³,体积吸水率为30.0%。试求:(1)甲材料的孔隙率、开口孔率和体积吸水率?(2)乙材料绝干体积密度和孔隙率?(3)比较甲乙两材料的保温性与抗冻性。
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