混凝土配合比设计及力学性能试验分析  

Concrete Mix Design and Mechanical Property Test Analysis

作　　者：董春盈[1] DONG Chun-ying(Lianyungang Vocational and Technical College,Lianyungang 222000,Jiangsu,China)

机构地区：[1]连云港职业技术学院,江苏连云港222000

出　　处：《合成材料老化与应用》2020年第5期90-93,共4页Synthetic Materials Aging and Application

基　　金：国家自然科学基金(59878043)。

摘　　要：研究了纤维对混凝土的抗压强度、劈拉强度、弯曲强度和弯曲应变等影响。通过试验得出:随着水胶比的增大,混凝土的抗拉、抗折强度逐渐减小;随着时间的增长,混凝土的抗拉、抗折强度也逐渐增加。当水胶比不变时,随着石粉掺量的增加,混凝土的抗压强度逐渐下降。掺合料在20%石粉的掺量条件下,C50混凝土若要7d达到50MPa的强度评定标准,则混凝土的水胶比为0.25;掺入纤维的混凝土进行劈拉强度试验时裂纹会贯穿整个横截面,但纤维阻止了立方体完全裂开;进行弯曲强度试验时,纤维-混凝土梁会当出现裂缝时,横梁没有损坏;在弯曲的初始阶段,应变的增加与载荷成正比。随着载荷增大,截面受拉区的应变增长加快。The effects of fiber on the compressive strength,splitting tensile strength,bending strength and bending strain of concrete are studied.The results show that:with the increase of water binder ratio,the tensile and flexural strength of concrete gradually decreases;with the increase of time,the tensile and flexural strength of concrete gradually increases.When the water binder ratio is constant,the compressive strength of concrete decreases with the increase of stone powder content.The results show that the water binder ratio of C50 concrete is 0.25 if the C50 concrete needs to reach the strength evaluation standard of 50 MPa in 7 d under the condition of 20%stone powder;the crack will run through the whole cross section when the concrete with fiber is mixed in the splitting tensile strength test,but the fiber prevents the cube from cracking completely;when the bending strength test is conducted,the beam of fiber-concrete beam will not be damaged when cracks appear.In the initial stage of bending,the increase of strain is proportional to the load.With the increase of load,the strain growth in the tensile region of the cross-section is accelerated.

关 键 词：纤维 混凝土 抗压 劈拉 弯曲 

分 类 号：TV431[水利工程—水工结构工程]