极旱荒漠区超氯盐渍土固化的试验研究

极旱荒漠区分布有大量盐渍土,对交通干线的建设造成极大危害.以超氯盐渍土作为研究对象,水玻璃作为固化剂,分别对其强度、吸湿性以及耐候性进行了分析.结果表明:水玻璃的浓度越高,固化超氯盐渍土的显微结构越为紧密,相应的其抗压、抗折强度逐渐升高.当浓度为16%水玻璃溶液在盐渍土中的掺量是18%时,固化试块的抗压强度就可在1 MPa以上.然而,由于Si-O-Al键遇水断裂,导致其防水性能较差,吸湿后抗压、抗折强度有所降低,但干燥失水后,强度又可恢复.自然环境放置30 d后,固化超氯盐渍土的质量虽有损失,但其抗压、抗折强度增加明显,耐候性能优异.

Experimental Study on Curing of Ultra-Chloride Saline Soil in Arid Desertification Area

A large number of saline soil is distributed in the extremely arid desert area,causing great harm to the construction of the traffic trunk line. Based on the super chlorine saline soil,using water glass as curing agent,its strength,moisture absorption and weatherability were analyzed. The study found that the higher the concentration of water glass,the closer the microstructure of the solidified superchloride saline soil,and the corresponding increase in compressive and anti-folding strength.When the contentration of water glass solution was 16% and the content in saline soil was 18%,the compressive strength of the cured specimen could be above 1 MPa.However,due to the failure of the Si-O-Al bond in water,the waterproof performance was poor,the compressive and anti-folding strength of the Si-OAl bond was lower. After the test piece was dehydrated,the strength could be restored. After 30 days of natural environment,the quality of solidified superchloride saline soil was lost,but its compressive and anti-folding strength increased obviously,and the weatherability could be superior.