摘要
以聚丙烯纤维为参照,研究了不同长度(12 mm、18 mm)和体积掺量(0.50%、0.10%、0.20%和0.30%)的短切玄武岩纤维对矿渣粉煤灰混凝土工作性能、抗压强度、劈裂抗压强度和抗折强度的影响,并采用扫描电镜(SEM)和压汞法(MIP)对纤维混凝土的微观形貌和孔结构进行了分析。结果表明:掺入玄武岩纤维可以显著提高矿渣粉煤灰混凝土的抗折强度和劈裂抗拉强度,但对抗压强度的改善并不明显,且以长度为18 mm的玄武岩纤维,体积掺量为0.20%时,对混凝土的抗压、抗折和劈裂抗拉强度的增强效果最为显著。SEM和MIP分析结果显示:一定掺量范围内,玄武岩纤维与基体界面黏结性能良好,能够有效抑制裂纹扩展,且玄武岩纤维的掺入能够降低混凝土中有害孔的比例,改善孔结构。
Compared with the polypropylene fiber（ PPF）,the effects of length（ 12 mm,18 mm） and the volume fraction（ 0. 50%,0. 10%,0. 20% and 0. 30%） of basalt fiber（ BF） on workability,compressive strength,splitting tensile strength and flexural strength were analyzed. The microstructure and pore distribution were investigated via scanning electron microscope（ SEM） and mercury intrusion porosimeter（ MIP）. The results show that adding BF significantly improves the splitting tensile strength and flexural strength,whereas the compressive strength shows no obvious increase. Furthermore,for the compressive,tensile and flexural strength of basalt fiber reinforced slag fly ash concrete,the optimum volume fraction of BF is 0. 20%,and the length of which is 18 mm. The result of SEM indicates that the bond strength between basalt fiber and matrix is good in a certain dosage. Moreover,the MIP results also showed basalt fiber can be able to reduce the proportion of harmful pores in concrete and optimize the pore distribution.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2017年第2期727-732,737,共7页
Bulletin of the Chinese Ceramic Society
基金
内蒙古科技大学校级重点教学改革项目(JY201514)
作者简介
李建（1977-），男，硕士，讲师．主要从事建筑信息化、钢管混凝土组合结构等建筑材料研究．
