| Citation: |
XUE Shanbin, WANG Dan, MA Jinyuan, et al. Effects of incorporated silane on mechanical and water absorption properties of sulphoaluminate cement mortar[J]. Acta Materiae Compositae Sinica.
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Sulphoaluminate cement (SAC)-based materials are characterized by early-strength and quick-setting, resistance to sulphate erosion, etc., and have a broad application prospect in the field of offshore infrastructure protection and repair. However, the porous structure formed after condensation and hardening of SAC-based materials can become infiltration channels for external water, accelerating their deterioration process in harsh environments. Therefore, hydrophobic modification of SAC-based materials by incorporating silane is of great significance for improving their durability in harsh environments. However, the influence of silane on the mechanical and water absorption properties of SAC-based materials at different ages and its microscopic mechanism are still unclear. In addition, the bonding performance between the fresh cement-based material and the substrate is affected by the silane content in the fresh cement-based material, the water saturation of the substrate and the curing duration. Therefore, the influence of silane on the setting time and hydration heat release behavior of SAC paste was analyzed in the present work. The evolution law and mechanism of the mechanical and water absorption properties of SAC mortar with the silane content and ages were discussed. The effect of silane content, substrate saturation and ages on the interfacial shear strength between SAC mortar and old mortar substrates were investigated.
(1) SAC paste with a water-cement ratio of 0.45 was prepared, according to the mass ratio of cement, water and superplasticizer as 1, 0.45 and 0.0084, and the amount of silane was determined as 0.5 %, 1 % and 2 % of cement mass. The initial and final setting times of the fresh SAC paste were determined with reference to the relevant specifications. The fresh SAC paste was put into the TAM AIR calorimeter soon for hydration heat test. (2) SAC mortar with a water-cement ratio of 0.45 was prepared according to the mass ratio of cement, sand, water, superplasticizer as 1, 2.7, 0.45and 0.0084, and the amount of silane was determined as 0.5%, 1%, and 2% of the mass of cement. The mortar slurry was first filled in 40mm × 40mm × 160mm test molds, and the molds were removed after curing in a standard curing room with 20℃ and 95 % RH for 6h, and the specimens were placed in a standard curing room to continue curing. The compressive and flexural strength and the capillary water absorption coefficients of the specimens were determined at the specified ages. (3) The old mortar substrate with 0%, 50% and 100% water saturation was prepared, and the fresh SAC mortar was poured on the side of the substrate. The composite specimens were cured in a standard curing room at 20℃ and 95 % RH for 6 hours, and then the mould was removed. Afterwards, the composite specimens were placed in the standard curing room to continue curing until the specified ages and to determine the interfacial shear strength between the SAC mortar and the substrate.
The SAC pastes incorporated with different contents of silane had the characteristics of quick-setting, and its intense hydration exothermic stage was concentrated within 2 hours after mixing with water. SAC mortars with different contents of silane incorporated had developed high compressive and flexural strengths at the age of 1d. At the age of 1 d to 28 d, the compressive strength of the specimens with silane was 83.9%~96.8% of that of the specimens without silane at the same age. The incorporation of silane only decreased the flexural strength of the early-age specimens. At the age of 28 d, the flexural strength of the specimens with silane was slightly higher than that of the specimens without silane. The capillary water absorption coefficients of the SAC mortar specimens with silane were 71.0%~94.2% lower than those of the specimens without silane. After the incorporation of silane, the porosity of SAC mortar did not increase significantly, while the volume fraction of capillary pores with diameter greater than 50 nm and the content of hydration products increased. The increase of silane content in SAC mortar led to the increase of surface water contact angle, which reduced its water absorption properties. At the age of 3d, the interfacial shear strength between the SAC mortar without silane and the substrate with different saturation was 1.27~1.72 MPa. The incorporation of silane was able to increase the interfacial shear strength between SAC mortar and substrates, and it was more significant at higher content. The interfacial shear strength between SAC mortar with 2% silane incorporated and substrates with different saturations increased by 19.2%~29.9% compared to the group without silane. The interfacial shear strength between the SAC mortar and the substrate decreased with increasing substrate saturation regardless of whether the silane was incorporated or not, and the interfacial shear strength between SAC mortar and saturated substrates was 22.5%~27.7% of that between SAC mortar and dry substrates. After bonding to substrates with different saturation, SAC mortar with silane still possessed low water absorption properties.Conclusions: (1) The SAC paste with silane can still be quick-setting, and its rapid hydration and exothermic stage was concentrated in 2h after mixing with water, and the SAC mortar with silane had the characteristic of early strength. The compressive strength of SAC mortar at the age of 1d ~ 28d was decreased after incorporating of silane, but the flexural strength at the age of 28d was slightly increased. The incorporation of silane significantly reduced the capillary water absorption coefficient of SAC mortar at different ages, and the higher the content, the more obvious. (2) The effect of incorporating silane on the porosity of SAC mortar was not significant at the age of 1d and 3d, but resulted in coarsening of its pores. The content of hydration products in the SAC paste with silane was higher than that in the blank group. The generation and overlapping of large amounts of needle-like ettringite as well as the mesh structure produced by silane condensation could improve the toughness of SAC mortar. The surface water contact angle of SAC mortar increased with the increase of silane content, and there was a good linear relationship between the capillary water absorption coefficient of SAC mortar with silane and the cosine value of its surface water contact angle. (3) At the age of 3d, the interfacial shear strength between SAC mortar and substrates increased with the increase of silane content, and decreased with the increase of substrate saturation. The silane-incorporated SAC mortar bonded to substrates with different saturation still possessed low water absorption properties.
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