Experiment And Study On Composite Capillary Crystalline Sandstone Reinforcement Protective Agent

This article analysis and research the status and disease mechanism of weathering of the local red sandstone historical relics for the protection of stone cultural relics of the ancient Heijing town of Yunnan Province, and also investigate comprehensivily, analysis preservation status, environment, stone types and characteristics, disease mechanism and characteristics of the red sandstone cultural relics。Due to its high water absorption rate of sandstone, the relatively low compressive strength, moisture resistance is inferior, easily lead to weathering, so various types of water (such as groundwater, surface water, rainwater) are the main factors of causing stone cultural relics weathering damage。Based on the earlier study, using water soluble inorganic material sodium silicat as basic material of protective agents on red sandstone with protection, through testing the indicators (such as compressive strength, water absorption, water resistance, salt resistance, acid resistance, moisture resistance, etc.) were identified in the ancient town development of the Yunnan red sandstone conservation agent research technique route. Experimental results show that:the protective agent treated red sandstone compressive strength increased by33%, moisture resistant strength increased by27%, red sandstone performance be improved. But as a result of sodium silicat in the storage process will continue to occur with aging, severely reducing the use of performance, therefore it needs to be modified, to eliminate and prevent aging, thereby improving the protective effect of red sandstone. Therefore, this paper also carried out the following aspects of the work.Chemical modification of single factor:This is mainly to sodium silicat are respectively added in sodium tripolyphosphate, polyacrylamide and Sodium dodecyl benzene sulfonate, to detect univariate components on red sandstone reinforcement waterproof effect. Experimental results show that:one-component optimum mix amount respectively sodium tripolyphosphate2%,polyacrylamide0.2%,Sodium dodecyl benzene sulfonate0.4%, protective solution on red sandstone cultural relics protection effect is best. But the single factors such as chemical modification, so in order to improve the protective agent for sandstone protection effect, this paper designed a modified formula, in order to facilitate the analysis of the experimental results and reduce the number of experiments, this paper using orthogonal design method to arrange the test time and combination, finally get the best combination of A2B2C2. The experimental results show that:A2B2C2formula in improving the compressive strength of red sandstone, outperforming other formula.Using A2B2C2program after treatment with red sandstone water absorption rate is reduced by60%, the compressive strength increases65%, moisture resistant strength increased by66%. Finally, using the scanning electron microscope on the A2B2C2solution treated red sandstone were measured and analysed, validation of the modified mechanism and modification effect.