Development of Nondestructive Testing Techniques on Penetration Depth Capability of Concrete Depth Penetrating Sealer

• Main Authors: Cheng-Yuan Chuang, 莊承淵
• Other Authors: Kai-Lin Hsu
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/46639884230271347964

碩士 === 國立高雄第一科技大學 === 營建工程研究所 === 103 === Concrete Depth Penetrating Sealer (CDPS) is a kind of waterproofing coating material, used in the existing and new structures, and helps to increase the durability and water resistance of concrete structure. When applied to the concrete surface, CDPS can penetrate into the interior of the concrete by water transport to produce insoluble inorganic dendritic crystals to increase the density of concrete and achieve the effect of waterproofing. At present, the effectiveness of CDPS waterproofing is verified by 28-day compressive strength and permeability tests as well as SEM (Scanning Electron Microscope, SEM) analysis to determine the crystalline microstructure of the penetration depth. However, the researches related to the application of physical approach for detection of inorganic dendritic crystals into the concrete penetration depth were quite rare so far. After applying CDPS on the concrete surface coating, the crystallization product from the surface into the concrete can be found to produce a dense layer for waterproof effect. The physical conduct based on this developed method for estimating the thermal characteristics of the crystalline penetration depth. Preliminary results show that the ultrasound test, percussion echo test and ground-penetrating radar test for penetration of dense crystalline layer crystallization no clear presumption of data, but the range of crystallization can be presumed by the thermal properties of penetration test. After the concrete surface coating CDPS, which crystallized from the surface into the concrete so as to produce a dense layer and gradually achieve waterproof effect; in this study are based on the physical behavior of the thermal characteristics of the way to develop a method for estimating the depth of penetration of crystallization. Preliminary results show that the ultrasound test, percussion echo test and ground-penetrating radar test for penetration of dense crystalline layer crystallization show unclear inferrence, but by the thermal properties of penetration test the range of crystallization can be estimated. The preliminary test results show the feasibility of estimating the thermal characteristics of the test depth penetration of crystallization, and L9(34) orthogonal array design experiments to explore various different factors affect the level of resistance, and by the results that crystallization deeper penetration depth (FD), shallow (FL) of the optimum ratio; namely cement ratio 0.6, 35% sand, paint thickness of 0.8 kg/m2, water-cement ratio 0.4, 55% sand, paint thickness of 0.5 kg/m2. Whereby the ratio of the thermal characteristics test optimization, test temperature of 90 ℃ and the temperature difference between the test time by analysis showed 60 minutes, you can get the credentials of the presumption of the physical behavior of the test have thermal characteristics, and within an hour it is presumed that the crystallization the depth of penetration. In this study, FL, FD two optimum thermal performance test by estimating the ratio of crystalline penetration depth was 2 cm and 3 cm. In addition, the results of microscopic analysis by SEM confirmed FL crystalline penetration depth of 2 cm; FD crystalline penetration depth of 3 cm. Experimental results show that the thermal characteristics of the test effectively reduce test time and reduce equipment costs, but also be able to grasp the crystallization agent CDPS sealer penetration effect.