Study On The Performance Of Cementitious Capillary Crystalline Waterproofing Material

With the reform and opening up of china and the rapid urbanization, the waterproof materials for building were applied more and more widely. Imported from abroad in recent years,the Cementitions Capillary Crystalline Waterproof Materials(CCCW) attracted people's attention for its unique performance. Due to technical imperfections in the domestic manufacturers, and the material itself as a rigid waterproof material which is greatly influenced by the matrix cracking and so on, so that the application of CCCW in the current domestic market was far short of the foreign level. In response to this situation, based on the imported waterproofing complexing agent and mixed with part of the domestic active substance efficiently, a CCCW with highly cost-effective and high crack resistance was worked out in this article.Based on the analysis of the penetration crystallization mechanism within the pores of concrete and the reference of existing products in foreign, the author combined with the research at home and aboard, selected several chemical substances and conducted the orthogonal test to determine the optimal combination. The performance testing was continued, proving that the performance met the national standard. Through the study and mechanism analysis of impermeability of the crack self-healing capillary crystalline concrete, it showed that the properties of concrete was improved by SJ capillary crystalline repairing material significantly, of which the impermeability was improved most ,up to 400%. Taking into account the crack resistance requirement of rigid waterproof material under certain environmental requirements, the research on the imperviousness and crack resistance of polypropylene fiber and capillary crystalline mortar was conducted. It worked out that the fiber could effectively relieved the occurrence of cracks and its development in mortar matrix, of which mixed with two materials, the maximum reduction of crack coefficient of mortar matrix was 82%; compared with the standard mortar, the amplification of impermeability pressure of 12mm, 1.0 kg·m-3polypropylene fiber mortar which compound mixed with 1.5% SJ material was up to 175%, and the secondary impermeability was obvious. It proved that the imperviousness and crack resistance technology of capillary crystalline waterproofing mortar which mixed with Polypropylene Fiber is feasible.The test specimens were observed by SEM, and its mechanism of action was analyzed. It finally reached that due to the cracking resistance of fiber, the impermeability of SJ material and interaction between the two, the waterproofing effect was increased, and the cracking resistance effect of their own was also promoted significantly.Finally, the construction applications of SJ material in the site was studied, which had achieved good practical effects, reflected its some practical value. The author also proposed the relevant construction techniques, quality control and acceptance criteria of this material.