Development of Expansive-High Strength Concrete and Systematic Evaluation of Structural Behavior of Reinforced Concrete Beams

具有超过100 N/mm^2的压缩强度和200 X10 ^<-8>最大限度开发的高强度混凝土（E-LAS），是由低热波特兰水泥、扩展性添加剂和减少收缩剂制成的。压力由E-LAS从0.5到.2 N/mm 2不等。哪一种不是强烈依赖于应变的？E-LAS和常规HSC（N-HAS）的Creativestrains的最大程度和速率在0.3的情况下，在水与粘结比率（W/B）中发现了在实验中没有明显的差异。线性爬行分析基于步骤对强化HSC光束显示出公平的良好协议，同时使用先前过度收缩压力和不合理的扩展压力的HSC与W/B的0.15的增量RB比率。对收缩压力的最佳估计的原因是通过在径向方向上检测微裂纹开发的，并通过incorporating t的计算结果得到了改进 ... More 混凝土依赖于该年龄的体积的软化; E-LAS的有效性已通过实验得到验证，以提高短、长、弹性裂纹宽度（如良好的曲线）的服务性能。光束和一个新的概念提出了评估它们基于张力RB在零混凝土压力条件下的张力RB深度到加载条件和与压力有关的变化在加载前后，适当地，如果曲线的有效性与常规方法和实验所获得的结果相比较，则在小裂缝宽度的情况下，张力软化效果必须考虑到。在E-LAS光束的边缘断裂时，有效深度（d）从250- 1000毫米，张力RB加载前的张力几乎为零，对d= 250毫米，张力RB的张力几乎为5%，因此，张力强度增加了5%。d= 500毫米的12%，d= 1000毫米的19%，与相同RB中的N-HAS光束相比，具有明显的收缩条纹。一个关于均衡张力RB比率的概念考虑RB strain due到早期年龄变形的概念已经提出。概念显示了在对角线断裂和（有效深度）之间的线性关系^<-1/3>早期变形的独立性，而先前提出的等式遵循了（有效深度）^<-1/2>和（有效深度）^<-2/5>的RC光束由N-HAS制成。一个拟议的公式基于这一概念显示出混凝土早期变形的高度预测准确性的影响，E-LAS在提高RC光束的剪切强度方面也具有良好的效果，其中的线性RB比率为0.25%，6%高于0.51%，相应地，与N-HAS光束相比。The shear RB strains平均一个主要的shear crack of E-LAS beams比那些N-HAS beams更小的那些可能被修改的truss理论粗略预测的，应用了一个提议的equation来评估shear抵抗的混凝土贡献。Less（低）

Expansive-high strength concrete(E-LAS) with compressive strength over 100N/mm^2 and expansive strain reaching 200 X 10^<-8> at maximum was developed, which was made of low heat Portland cement, expansive additive and shrinkage reducing agent.Stress produced in E-LAS ranged from 0.5 to・.2 N/mm2, which was not strongly dependent on the strain.The ultimate and rate of creep strains of E-LAS and conventional HSC(N-HAS) obtained experimentally showed less difference between both concretes for the case of with water to binder ratios(W/B) of 0.3. Linear creep analysis based on step by step for reinforced HSC beams showed fairly good agreement with experimental results, while the former overestimated shrinkage stress and underestimate expansive stress of HSC with W/B of 0.15 with the increase of RB ratio. The reason for the overestimate of shrinkage stress was explained by the detection of micro cracking developed in the radial direction and the computed result was improved by incorporating t … More ension softening of concrete depending on the age.Effectiveness of E-LAS was verified by experiment for improving the serviceability performance of short-and long-term flexural crack width as well as curvature of reinforced concrete(RC) beams and a new concept was proposed for evaluating them based on the strain change in tension RB from the zero concrete stress condition at tension RB depth to the loaded condition and the change of stress related curvature before and after loading, respectively, whose validity was verified by comparing with results obtained by conventional method and experiment, while tension softening effect must be considered in case of small crack width.Shear strength at diagonal cracking of E-LAS beams, whose effective depth(d) is from 250-1000mm and strain in tension RB before loading is almost zero, was improved by 5% for d=250mm, 12% for d=500mm and 19% for d=1000mm, compared with that of N-HAS beams with remarkable shrinkage strain in the same RB. A concept of equivalent tension RB ratio considering RB strain due to early age deformation was proposed. The concept showed the linear relationship between shear strength at diagonal cracking and (effective depth)^<-1/3> independent of early age deformation, while previouisly proposed equations followed the law of (effective depth)^<-1/2> and (effective depth)^<-2/5> for RC beams made of N-HAS. A proposed equation formulated based on this concept showed high prediction accuracy independent of the magnitude of early age deformation in concrete.E-LAS was also effective in improving shear strength of RC beams which was 13% for shear RB ratio of 0.25% and 6% for 0.51% higher than that of corresponding N-HAS beam, respectively. The shear RB strains averaged along a primary shear crack of E-LAS beams were smaller than those of N-HAS beams which could be roughly predicted by the modified truss theory applied a proposed equation for evaluating concrete contribution for shear resistance. Less