Present work demonstrates the experimental investigation on four large scale reinforced concrete (RC) beams cast with and without smart concrete to study strain and damage sensing properties (for health monitoring), effect of carbon fiber (CF) on ultimate strength, crack pattern, and stiffness response under monotonically increased loading. A total of four beams, one without and three with smart concrete (CF‐based concrete) having similar dimensions, similar percentage of reinforcement, similar aspect ratio, same grade of steel but having variable strengths of concrete were cast and tested for evaluating above said properties. Micro CFs were placed only in mid‐span region for a length of 350 mm and a depth of 55.5 mm at top and bottom surface of the beam from economical point of view for health monitoring. From obtained experimental results, it was found that RC beam embedded with smart concrete can be used for structural health monitoring (SHM) and obtained fractional change in resistance of smart concrete can be corelated with compressive strain in concrete and tensile strain in steel up to good extent. Along with strain and damage sensing properties, the effect of smart concrete on structural properties is also reported and it was found that, apart from showing positive results for SHM, it also increases ultimate strength carrying capacity of the same RC beam. Also the experimentally obtained ultimate strength values were compared with theoretical predicted values using IS456‐2000, ACI 318–11, and CSA A23.3–04 codes.

中文翻译：

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智能混凝土在钢筋混凝土梁的应变传感和结构特性中的作用

目前的工作表明了在有或没有智能混凝土的情况下对四种大型钢筋混凝土（RC）梁进行的实验研究，以研究应变和损伤感测性能（用于健康监测），碳纤维（CF）对极限强度，裂缝模式的影响，以及单调增加载荷下的刚度响应。总共浇铸了四根横梁，其中一根不带三根，而三根采用智能混凝土（CF基混凝土），具有相似的尺寸，相似的钢筋百分比，相似的长宽比，相同等级的钢但具有不同的混凝土强度，并进行了上述测试。属性。从经济的角度来看，微型CF只能放置在中跨区域，长度为350毫米，在梁的顶部和底部表面的深度为55.5毫米，以进行健康监测。根据获得的实验结果，研究发现，嵌有智能混凝土的RC梁可用于结构健康监测（SHM），并且获得的智能混凝土阻力的分数变化与混凝土的压缩应变和钢的拉伸应变相关程度最高。除了应变和损伤感测特性外，还报道了智能混凝土对结构特性的影响，发现除了对SHM表现出积极的结果外，它还增加了同一RC梁的极限强度承载能力。还使用IS456-2000，ACI 318-11和CSA A23.3-04代码将实验获得的极限强度值与理论预测值进行了比较。