Neutron diffraction studies on strain evaluation of rebar in reinforced concrete
Neutron diffraction studies on strain evaluation of rebar in reinforced concrete
复制标题
钢筋混凝土中钢筋应变评估的中子衍射研究
DOI：
10.1154/1.3139052
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发表时间：
2009
影响因子：
0.5
通讯作者：
K. Kusunoki
中科院分区：
文献类型：
--
作者：
H. Suzuki;M. Kanematsu;K. Kusunoki
应用中子衍射法测量了钢筋混凝土中钢筋的应变分布。首先，测定了几种不同水、水泥、骨料配合比混凝土的吸水系数，确定了混凝土的吸水系数受水和骨料掺量的影响。此外，通过测量钢筋在拉伸荷载作用下的应变变化，也说明了钢筋混凝土中钢筋应变测量的准确性不受混凝土对中子的吸收影响。其次，通过测量钢筋在拉拔荷载作用下的应变分布来评估锚固区的大小。中子衍射法测得的锚固区长度小于应变片测得的锚固区长度。此外，还测量了混凝土裂缝周围钢筋在拉伸荷载作用下的详细应变分布，证实了用中子衍射法可以评价裂缝周围钢筋与混凝土的粘结状态。
The neutron diffraction technique was applied to measure strain distributions in a rebar in a reinforced concrete. At first, absorption coefficients of several kinds of concrete with different compounding ratios of water, cement, and aggregate were measured, and it was confirmed that the absorption coefficient of concrete was affected by the amounts of water and aggregate. In addition, it was also clarified by measuring strain change of the rebar under tensile loading that accuracy of the strain measurement in the rebar in the reinforced concrete was not affected by the neutron absorption by the concrete. Second, the size of the anchorage zone was evaluated by measuring strain distributions in the rebar under pull-out loading. The length of the anchorage zone measured by neutron diffraction was shorter than that measured by strain gauges. Moreover, detailed strain distributions in the rebar around cracks in the concrete were measured under tensile loading, and it was confirmed that the bond condition between rebar and concrete around cracks could be evaluated using the neutron diffraction technique.