含纳米二氧化硅无碱速凝剂对C30喷射混凝土耐久性的影响  

The effect of nano silica modified alkali free quick setting agent on the durability of C30 shotcrete

作　　者：王立亚 宋西成 刘军 蔡贵生 王海建 王开宇 WANG Liya;SONG Xicheng;LIU Jun;CAI Guisheng;WANG Haijian;WANG Kaiyu(Shandong Jianke Building Materials Co.Ltd.,Ji'nan 251600,China;Jinan Key Laboratory of Concrete Admixtures,Ji'nan 251600,China;Ji'nan High Performance Civil Engineering Materials Engineering Research Center,Ji'nan 251600,China)

机构地区：[1]山东建科建筑材料有限公司,山东济南251600 [2]济南市混凝土外加剂重点实验室,山东济南251600 [3]济南市高性能土木工程材料工程研究中心,山东济南251600

出　　处：《新型建筑材料》2025年第4期38-41,60,共5页New Building Materials

基　　金：山东省科技型中小企业创新能力提升工程(2022TSGC2022);山东省建筑与交通双碳创新创业共同体2024重大项目(STGTT0201202404)。

摘　　要：通过抗渗和抗冻性能试验,研究含纳米二氧化硅无碱速凝剂对C30喷射混凝土耐久性的影响,并比较纳米二氧化硅的分散方式对其性能的影响。结果表明,与掺普通速凝剂相比,掺入含适量纳米二氧化硅速凝剂后,混凝土的电通量和平均渗水高度均减小,弹性模量提高,质量损失率和抗压强度损失率均减小,说明含适量纳米二氧化硅速凝剂能提高混凝土的抗渗和抗冻性能,并能有效抑制混凝土中气泡增大;此外,与外掺纳米二氧化硅相比,预先在速凝剂中分散纳米二氧化硅的效果更好。Through water penetration resistance and freeze-thaw resistance tests,the influence of alkali-free accelerators containing nano-silica on the durability of C30 shotcrete was investigated,and the effects of different dispersion methods of nanosilica on the properties of the concrete were compared.The results show that compared with ordinary accelerators,the addition of nano-silica accelerators reduces the electrical flux and average water penetration height of the concrete,increases the elastic modulus,and reduces the mass and compressive strength loss rates.This indicates that the alkali-free accelerators containing nanosilica can improve the water penetration and freeze-thaw resistance of the concrete and effectively inhibit the enlargement of air bubbles within the concrete.Moreover,pre-dispersing nano-silica in the accelerator achieves better results compared with the external addition of nano-silica.

关 键 词：无碱速凝剂 纳米二氧化硅 喷射混凝土 耐久性 

分 类 号：TU528.042[建筑科学—建筑技术科学]