外加剂改善石膏耐水性能试验研究

摘要

石膏作为一种气硬性胶凝材料具有耐水性差的重大缺陷，限制了它的应用领域。掺入一种外加剂提高石膏材料的耐水性能，并探讨其对石膏表观密度、强度、吸水率、软化系数的影响。结果表明：当外加剂掺量为30%时，石膏干燥状态下7 d抗压强度和抗折强度分别为27.07 MPa和1.98 MPa，吸水率降低了16.12%，抗压、抗折软化系数分别提高73%和300%。%As a kind of air hardening inorganic binding materials, gypsum has poor water resistance, which limits its use. Additive was used to improve the water resistance of gypsum materials, and discussed its effect on gypsum-based materials’ apparent density, strength, water absorption, softening coefifcient. The results showed that:when additive dosage was 30%, the dry compressive strength and lfexural strength on 7 d of gypsum were 27.07 MPa and 1.98 MPa;water absorption decreased 16.12%;compression and lfexural softening coefifcient increased 73%and 300%respectively.