摘要
断裂能是评价玻璃纤维增加水泥(GRC)抵抗开裂能力的重要技术指标.文中通过试验研究了玻璃纤维长度和掺量、水胶比、砂胶比对预混浇注生产的GRC断裂能的影响.研究表明:玻璃纤维显著提高了水泥基材料的断裂能,玻璃纤维掺量不超过固体组分质量的3%时,GRC断裂能随着玻璃纤维掺量的增加而大幅增大,近似成直线关系;玻璃纤维掺量相同的情况下,随着玻璃纤维长度的增加,GRC的断裂能先增大后减小,玻璃纤维长度为20 mm时GRC有较高的断裂能;GRC的断裂能主要来源于玻璃纤维的拔出能,水胶比和砂胶比都对玻璃纤维的拔出能有显著影响;水胶比的增加会降低GRC的抗弯强度,但GRC的断裂能随着水胶比的增加而大幅增大;水胶比从0.32增加至0.50时,GRC的断裂能增幅达227%;GRC的断裂能随着砂胶比的增加而减小.
Fracture energy is an important technical index to evaluate the anti-cracking capacity of glass fiber-reinforced cement(GRC).In this paper,the effects of glass fibre length and content,water-to-binder ratio and sand-to-binder ratio on the fracture energy of GRC produced by premixed casting were studied through experiments.The results show that(1) glass fibre significantly improves the fracture energy of cement-based materials,for instance,when the glass fibre content does not exceed 3% of the solid component mass,the fracture energy of GRC greatly increases with the increase of glass fibre content in an approximately linear relationship;(2) at constant glass fibre content,the fracture energy of GRC increases first and then decreases with the increase of glass fibre length;(3) when the glass fibre length is 20 mm,GRC possesses higher fracture energy;(4) the fracture energy of GRC is mainly derived from the extraction energy of glass fibre that being significantly affected by both the water-to-binder ratio and the sand-to-binder ratio;(5) the increase of water-to-binder ratio may lead to the reduction of flexural strength of GRC,but the fracture energy of GRC significantly increases with the increase of water-to-binder ratio;(6) when the water-to-binder ratio increases from 0.32 to 0.50,the fracture energy of GRC increases by 227%;and(7) the fracture energy of GRC decreases with the increase of sand-to-binder ratio.
作者
程从密
张健
甘伟
LUOZheng-tang
张亚芳
何娟
CHENG Congmi;ZHANG Jian;GAN Wei;ZHANG Yafang;HE Juan(School of Civil Engineering,Guangzhou University,Guangzhou 510006,Guangdong,China;Department of Chemical and Biological Engineering,The Hong Kong University of Science and Technology,Kowloon,Hong Kong,China)
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第11期47-52,67,共7页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省科技计划项目(2015B020238006
2013A011401009)~~
关键词
玻璃纤维增强水泥
断裂能
预混浇注法
水胶比
砂胶比
glass fibre-reinforced cement
fracture energy,premixed casting method
water-to-binder ratio
sand-to-binder ratio
