【摘要】 通过方板弯曲能量韧性试验和三分点梁弯曲韧性试验,研究了玄武岩纤维和钢纤维混合对混凝土韧性特征的影响。对混合纤维混凝土进行抗压、抗折强度试验,对比玄武岩纤维混凝土强度,研究两种纤维对混凝土强度的影响。借鉴欧洲EFNARC韧度等级划分和美国规范ASTM C1018韧性指数等标准,在弯曲韧性试验中获得变形能量值和韧性指数,评价玄武岩混合纤维混凝土的弯曲韧性特征。试验结果表明,混合纤维混凝土方板能量值达500 J以上,韧性能量等级达到B级,3根试验梁韧性指数比接近100,韧度值均达到优秀,两个韧性试验均表现出混合纤维混凝土的良好韧性特征;玄武岩纤维混凝土抗压、抗折强度较素混凝土增长比例达11%以上,与钢纤维混合作用时,混凝土强度增加更为明显,强度增长比例达16%~20%。更多还原

【Abstract】 By square plate bending energy toughness test and three-point beam bending toughness test,the effect of basalt fiber and steel fiber on concrete toughness is studied. The compressive and the flexural bending strength tests of the mixed fiber concrete are carried out,and the strengths of basalt fiber concrete are compared,therefore the effect of basalt fiber and steel fiber on concrete strength is studied. Referencing the toughness grades division in Europe EFNARC and the toughness indexes in ASTM C1080,the deformability energy and toughness index are obtained in flexural toughness test to evaluate the flexural toughness properties of basalt fiber concrete mixed with steel fiber. The test result indicates that( 1) the energy of mixed fiberreinforced concrete plates reaches more than 500 J,and the toughness property reaches level B;( 2) the toughness indexes of 3 tested beams are close to 100,indicating the excellent flexural toughness features,and the results of the 2 toughness tests show the good property of flexural toughness of mixed fiber concrete;( 3)the compressive and flexural strengths of basalt fiber concrete increase by more than 11% compared with plain concrete;( 4) mixed with steel fiber,the strength increment of basalt fiber mixed reinforced concrete is obvious,and flexural strength increase by 16%- 20%.更多还原