In view of the fact that prediction of creep and shrinkage with current bridge provision for specific concrete under specific ambience sometimes has a big discrepancy with real values , a new method to obtain the expressions of creep and shrinkage from newly - built pc bridges short - term test results is presented , and relative equations have been established . therefore , a reliable long - term prediction on effect due to creep and shrinkage in pc bridges holds a firm bearing point 研究中发现某一特定环境下工作的混凝土用现有规范公式预测得到的徐变、收缩特性常有偏差较大的现象，由此提出了从新建预应力混凝土桥梁短期试验结果推算梁体相应素混凝土在工作环境下的徐变、收缩特性的思想和方法，并建立了计算式，为新建预应力混凝土桥梁可靠的徐变效应分析提供了前提和保证。
( 6 ) the electrically induced strain is observed in both cfrc and plain oncrete . compared with plain concrete , cfrc demonstrates more sensitive to the outward electric field . that is , cfrc can produce the same strain as plain cement paste with smaller voltage （ 6 ）得出了碳纤维混凝土和素混颁土在外加电场作用下，山电场产生的变形与电场的对应关系，表明电场引起的变形随外加电压的增加而增加，梁弯曲的方向随电场方向而变化，碳纤维混凝土比素混凝土具有高的电力敏感性。
Test results show that the steel fiber in concrete have more effectiveness on improving the splitting tensile strength and the flexural strength in the early age than after its hardening ; the flexural modulus of elasticity of sfrc are higher than the plain concrete at different ages while their compressive modulus of elasticity are almost the same . it ' s also shown that , similar to the plain concrete , the early - age loading decreases the strengths of sfrc , but , with the increase of the contents of the steel fiber things are getting better , especially for the splitting tensile strength and the flexural strength 试验结果表明：与性能稳定之后相比，在混凝土中掺入钢纤维对它的早期劈裂抗拉强度和抗折强度有尤为显著的提高作用；对各龄期的受压弹性模量影响不大，而对提高抗折弹性模量有一定的效果；与素混凝土试件相同，在早期(强度达到28天强度的85前)对钢纤维混凝土试件施加荷载会对它的各种强度产生一定的不利影响，但是掺入钢纤维可以减轻这种不利影响，尤其对劈裂抗拉强度和抗折强度作用突出，并且含纤率越高，效果越明显。
