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用无C_3A水泥(或纯阿利特)与钙矾石按不同比例混合压成密实体的吸水试验表明,钙矾石能吸水而产生膨胀。其膨胀量随钙矾石加入量和密实压力的增大而增大。当钙矾石(27.5个结晶水)的含量为50％时,取决于钙矾石的制备方法的不同,密安体的胀胀量约在2～3％。用C_3A加石膏通过浆体水化制备的含有27.5、29.0、32.1个结晶水的钙矾石的密实体(钙矾石含量50％)的膨胀量分别为3.1％、2.97％和2.5％。
The water absorption test using no C_3A cement (or pure Alite) and ettringite mixed in different proportions to form a dense solid indicates that ettringite can absorb water and cause expansion. The swelling increases with the increase of ettringite addition and compaction pressure. When the content of ettringite (27.5 crystal waters) is 50%, depending on the preparation method of ettringite, the expansion amount of the meianite body is about 2 to 3%. The swelled volume of ettringite containing 27.5, 29.0, and 32.1 crystal waters prepared by C3A plus gypsum hydration (50% of ettringite) was 3.1%, 2.97%, and 2.5%, respectively.