Investigation on the water-resistance of silica-magnesia cementitious material
CUI Hongtao
JIN Lutong
PENG Jiahui
WANG Zifu
ZHANG Xingfu
Abstract：Active silica stuffing has an important influence on the water-resistance of magnesia cementitious material. Material proportioning was designed under the active MgO/MgCl2 molar ratio of 7,and the influences on material's water-resistance by dif-ferent silica stuffing and phosphates-based activators were studied. The optimal proportioning of silica stuffing to activator was de-termined on the basis of the extent to which the water-resistance of magnesia cement is enhanced,and the experiment of non-dis-persion and water-hardening was undertaken. The test results show that coefficient of softness of the material could be enhanced dramatically with best water-resistance by using 30% silica fume as stuffing and 1% monosodium phosphate as activator. By this proportioning,the water-resistance of magnesia cement is dramatically enhanced,and a hardening process under water has been achieved in the typical air-hardening magnesia cementitious material,with a long-time strength stability.
Keywords：magnesia cementitious materialsilica stuffingwater-resistancewater-hardening
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 35-39,69 )