用于GFRP筋的高强低碱砂浆涂层制备及性能分析  

Preparation and performance analysis of high-strength and low-alkali mortar coating for GFRP bars

作　　者：吴亚月 商怀帅[1] 王春增 WU Yayue;SHANG Huaishuai;WANG Chunzeng(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China;Qingdao Real Estate Development Center,Qingdao 266000,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266525 [2]青岛市房地产事业发展中心,青岛266000

出　　处：《青岛理工大学学报》2024年第6期51-58,共8页Journal of Qingdao University of Technology

基　　金：山东省自然科学基金重大基础研究项目(ZR2022ZD33);青岛市科技惠民示范专项项目(23-2-8-cspz-9-nsh)。

摘　　要：利用矿物掺合料制备了用于玻璃纤维增强复合材料(GFRP)筋表面的高强低碱砂浆涂层,测取了所制涂层的耐碱性、pH值、抗压强度、抗折强度以及微观组分,并分析了不同矿物掺合料掺量和不同胶凝材料用量对所制涂层pH值、抗折强度及抗压强度的影响。试验结果表明:所制涂层耐碱性良好,在耐碱性测试中没有出现剥落、失去黏结性等现象;胶凝材料用量为250 kg/m^(3),水泥掺量为40%,硅灰掺量为60%的配比最适宜配制GFRP筋表面砂浆涂层;砂浆涂层pH值随着矿物掺合料掺量的增加不断降低,砂浆抗折、抗压强度随着单掺硅灰掺量的增大呈现先增大后减小的变化趋势,而随着复掺粉煤灰掺量的增加不断减小;当龄期达到28 d时,砂浆涂层中仍存在未反应的SiO2和硅酸盐,后期可以与浇筑在涂层GFRP筋表面的混凝土共同水化,提高GFRP筋与混凝土间的黏结强度。High-strength and low-alkali mortar coating for glass fiber reinforced polymer(GFRP)bars was prepared using mineral admixture.The alkali resistance,pH value,compressive strength,flexural strength and micro-component of the coatings were measured,and the effects of the different contents of mineral admixture and different amounts of cementitious materials on the pH value,flexural strength and compressive strength of the coatings were analyzed.The test results showed that the coating had good alkali resistance,and phenomena like spalling and loss of adhesion did not occur in the alkali resistance test.The ratios of 250 kg/m^(3) of cementitious material,40%of cement and 60%of silica fume were most suitable for the GFRP bars’surface mortar coating.The mortar coating’s pH value decreased with the increase of the content of mineral admixture,and the flexural and compressive strength of the mortar showed a trend of increasing and then decreasing with the increase of the content of single silica fume,and decreased with the increase of the content of compound fly ash.When the age reached 28 days,there were still unreacted SiO_(2) and silicate in the mortar coating,which can react with the concrete poured on the GFRP bar surface later,thereby improving the bond strength between the GFRP bar and concrete.

关 键 词：矿物掺合料 玻璃纤维增强复合材料(GFRP) 高强低碱 砂浆涂层 微观组分 

分 类 号：TU502.4[建筑科学—建筑技术科学]