改性水硬性石灰基材料的制备与耐久性

Preparation and Durability of Modified Hydraulic Lime-based Material

为了得到更加适宜于岩土文物保护加固的水硬性石灰材料,研究了掺加矿粉、外加剂和聚乙烯醇纤维的改性水硬性石灰的配合比优化设计、力学性能、水化硬化机理和耐久性.研究发现:矿粉、外加剂和聚乙烯醇纤维能显著提高水硬性石灰的力学性能以及耐久性;经改性后的水硬性石灰试样D,其抗折强度、抗压强度和拉拔强度分别能达到3.27、15.45、0.61 MPa,而且,经过耐水、耐盐和干湿循环试验后,仍然保持较高的力学性能,这对于岩土质文物的保护修复具有重大的意义.

In order to get more suitable hydraulic lime materials for stone and earthen historical relics reinforcement conservation,the slag,admixtures and polyvinyl alcohol fiber modified hydraulic lime mixture proportion optimization design, physical mechanical properties, mechanism of hydration hardening and durability were studied in this paper. The researches show that adding slag,admixtures and polyvinyl alcohol fiber can significantly improve the samples ＇physical mechanical properties and durability. The flexural strength,compressive strength and pull strength of the modified hydraulic lime sample D had reached at 3. 27,15. 45 and 0. 61 MPa,respectively. Moreover,after the water,salt and dry-wet cycle tests, the sample D still keeps high mechanical properties, which have important implications for conservation and restoration of the stone and earthen historical relics.