Preparation And Performance Study Of Cementitious Capillary Crystalline Waterproofing Coating

Cementitious capillary crystalline waterproofing coating(CCCW)was widely used as a new inorganic waterproof material, because of it’s excellent waterproofing performance through capillary crystallization to improve the compactness structure of the substrate. Cementitious capillary crystalline waterproofing coating(CCCW)was mainly used in dorsal surface of cementitious material, not only require the surface waterproofing ability, the more important is the entire structure is dense enough to waterproofing through capillary crystallization, which ensure that the entire structure resist the infiltration of water molecules. So the formulation development of cementitious capillary crystalline waterproofing coating(CCCW)and it’s macro-mechanical properties and exploration of mechanism to repellent research should be studied for the development of building waterproofing materials has a far-reaching significance.Siloxane was used as active material mixed with cementitious materials, supplemented by ground granulated blast furnace slag (GBFS)and reactive silica fume(SF) admixture to improve the properties of cementitious materials. In the test siloxane was modified which improve the waterproofing ability and make waterproofing performance contrast with unmodified siloxane to choose the best modification parameters. Based on orthogonal experimental design method, select the main factors which influence the performance of repellent,28d impermeability pressure and compressive strength as performance indicators, through experiment to chose the best treatment and dosage formulations of preparing cementitious capillary crystalline waterproofing coating(CCCW). The physical performances both of coating and the concrete coated with coating were tested accordance with GB18445-2012, according to test obtained of formula. Results show that the setting time, soundness, mechanical performance and binding strength performance in accordance with request of GB 18445-2012 and the coating also has low dry-shrinkage, high anti-crack performance and excellent anti-corrosion properties; Impermeability pressure of the coating is 1.4MPa,secondary impermeability pressure reached 0.9MPa and ratio of penetration pressure was 225%, wet surface bonding strength is 2.87MPa, which is 2.8 times of the national standard, compressive strength is 53.8MPa, which is 3.5 times of the national standard, and bending strength is 7.2MPa,2.5 times as high as the standard requirement, the all performances satisfied the requests of GB18445-2012, which can be used as a permanent waterproof coating. On the basis of experiment excellent impermeability properties was selected, and the pore structure, pore size distribution and hydration products of coating layers(CL), interfacial transition zone(ITZ), substrate layer (SL)were characterized to study the effect of capillary crystallization on the pore structure of interfacial transition zone(ITZ).Reference process for the spray drying of liquid siloxane preparation as powder active substances, mixed with cementitious materials to improve the strength and water resistance of cementitious capillary crystalline waterproofing coating(CCCW),which brought the construction convenient. The parcel through the wall material of active substances dissolved in water, remains the role of active substances, for the preparation of cementitious capillary crystalline waterproofing coating(CCCW) process has practical significance.X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FI-IR), specific surface area(BET), scanning electron microscopy (SEM) were used to character the microscopic analysis of cementitious capillary crystalline waterproofing coating(CCCW), by means of permeable crystallization of micro-mechanism of representation, permeable crystallization mechanism cementitious capillary crystalline waterproofing of coating(CCCW) was discussed from the physical chemistry perspective.