土遗址锚固用PS-(C+F)浆液性能与结石体耐久性室内试验

为科学揭示土遗址本体锚固用PS-(C+F)浆液的凝结固化特征和结石体的长期性能,针对标准稠度试验确定的最佳水灰比(0.39)的浆液,通过龄期强度、龄期含水率、龄期波速、收缩特性等试验,查明了浆液的凝结固化特征;通过温湿度循环、冻融循环、水稳定性、安定性和耐碱性等耐候性试验手段,研究了结石体的耐久性特征。试验结果表明,本浆液龄期强度满足施工工艺的需求,结石体在外观、密度、孔隙率、强度上和土体具有较好的兼容性,较低的收缩率保证了锚固界面的性能,结石体具有典型的弹脆性力学特征;结石体具有优良的耐久性,可以有效的抵御西北干旱半干旱区的气候,但在硫酸钠高含量遗址土体中不适用。研究证明,配合比为C∶F=1,PS∶(C+F)=0.39的PS-(C+F)浆液适宜于中国西北地区土遗址本体锚固,具有较强的兼容性和耐久性。

Laboratory tests on property and durability of PS-(C+F) slurry used in anchoring conservation of earthen sites

To scientifically reveal the characteristics of the setting and long-term performance of PS-(C+F) slurry which is applied in the anchoring conservation of earthen sites, the slurry with the optimum mix ratio (0.39) is studied by means of aging strength, aging moisture, aging wave velocity and shrinkage tests, and its durability is investigated by using the temperature-humidity cycling, frozen-thaw cycling, water stabilizing, soundness and alkali resistivity tests. The test results indicate that the aging strength can firmly meet the requirements of the anchoring craft, and that the elastic-fragile mechanical performance of the slurry is compatible to the earthen sites on the appearance, density, void ratio and strength. Furthermore, the very low shrinkage guarantees the interfacial mechanical property. Besides them, the consolidation has a strong durability to resist the arid and semi-arid climate in Northwest China. However, the slurry is not suitable for the earthen sites with high-content sodium sulphate. In conclusion, with strong compatibility and durability, the PS-F slurry with mix ratio of (C∶F=1, PS∶( C+F) =0.39) can satisfy the need of the anchoring conservation of earthen sites in Northwest China.