低模量合成纤维对混凝土基本徐变的影响  

Effect of Low Modulus Synthetic Fiber on Basic Creep of Concrete

作　　者：李天伦 吴永根[1] 吴豪祥 LI Tianlun;WU Yonggen;WU Haoxiang(Aviation Engineering School,Air Force Engineering University,Xi’an 710038,China;Unit 94381,Wuyishan 354300,Fujian,China)

机构地区：[1]空军工程大学航空工程学院,西安710038 [2]中国人民解放军94831部队,福建武夷山354300

出　　处：《空军工程大学学报（自然科学版）》2022年第3期97-102,共6页Journal of Air Force Engineering University(Natural Science Edition)

摘　　要：为了研究低模量合成纤维对混凝土基本徐变的影响,进行了3种不同掺量低模量合成纤维混凝土徐变试验,并将试验结果与相关预测模型计算结果进行了对比。结果表明,低模量合成纤维的掺入对混凝土抗压强度和弹性模量影响较小,但会增大混凝土的基本徐变。相对于未掺纤维的混凝土试样,0.8 kg/m 3、1.2 kg/m 3和1.6 kg/m 3掺量的混凝土试样的徐变度分别增加了7.9%、10.1%和10.0%,徐变系数分别增加了15.3%、17.2%和1.9%,单位应力下的总压缩应变分别增加了1.1%、2.3%和8.9%。混凝土徐变度实测结果与ACI-209R模型的吻合度最高,与CEB-FIP模型的吻合度次之,但两者均无法直接用于低模量纤维混凝土基本徐变的预测,公式相关参数需要依靠短期测试进行回归,GL-2000模型的误差较大,不适用于低模量合成纤维混凝土徐变的预测。In order to study the effect of low modulus synthetic fiber on basic creep of concrete,three creep tests of low modulus synthetic fiber concrete with different dosage are carried out,and the test results are compared with the calculation results of relevant prediction models.The results show that though the addition of low modulus synthetic fiber has little effect on the compressive strength and elastic modulus of concrete,the basic creep of concrete increases.Compared with the concrete samples without fiber,the creep degree of 0.8 kg/m 3,1.2 kg/m 3 and 1.6 kg/m 3 concrete samples increase by 7.9%,10.1%and 10.0%respectively.The creep coefficient increases by 15.3%,17.2%and 1.9%,and the total compressive strain per unit stress increases by 1.1%,2.3%and 8.9%respectively.The measured result of concrete creep degree has the highest agreement with ACI-209R model,followed by CEB-FIP model.However,neither of them can be directly used to predict basic creep of low-modulus fiber reinforced concrete,and the relevant parameters of the formula need to rely on short-term test for regression.However,the GL-2000 model has a large error and is not suitable for the prediction of creep of low modulus synthetic fiber concrete.

关 键 词：合成纤维 混凝土 基本徐变 徐变度 徐变系数 

分 类 号：TU528.572[建筑科学—建筑技术科学]