微膨胀抗冲磨混凝土早期徐变理论与试验研究

发布时间：2018-08-18 14:59

【摘要】：早期徐变特性是开裂敏感性评价中很重要的因素,为建立精度更高的微膨胀抗冲磨混凝土早期徐变模型,提高早期混凝土应力计算精度、裂缝预测和控制的能力,本文基于丹麦标准TI-B102(95)的徐变试验测试方法,针对混凝土早龄期徐变测试需要,将初始加载龄期从3d提前到20h左右、将龄期3d前的加卸载周期加密至1 d左右和每10 min自动采集变形数据3个方面,对丹麦技术研究所提出的早期徐变测试方法做进一步改进;通过间歇式加卸荷载的特殊加载方式,在大量试验数据的拟合和优化基础上,得到早期徐变模型的黏性和弹性系数,获得了拟合相关性系数大幅度提高(达到0.96)的早期黏弹性模型。该方法的引用和改进,可以弥补目前国内在早期徐变测试领域的空白。
[Abstract]:The early creep characteristic is an important factor in the evaluation of cracking sensitivity. In order to establish a more accurate early creep model of micro-expansion anti-abrasion concrete, improve the accuracy of stress calculation, the ability of crack prediction and control. Based on the creep test method of Danish standard TI-B102 (95), the initial loading age is advanced from 3 days to about 20 hours to meet the need of early age creep testing of concrete. The loading and unloading period before 3 days is encrypted to about 1 day and the deformation data is automatically collected every 10 min. The method of early creep testing proposed by Danish Institute of Technology is further improved. Based on the fitting and optimization of a large number of experimental data, the viscosity and elastic coefficient of the early creep model are obtained by the special loading mode of intermittent loading. An early viscoelastic model with a significant increase in fitting correlation coefficient (up to 0.96) was obtained. The application and improvement of this method can make up for the gaps in the field of early creep testing in China.
【作者单位】：江西省水利科学研究院;南京水利科学研究院;水利部水工新材料工程技术研究中心;
【基金】：中国博士后科学基金项目(2017M612154) 中央级公益性科研院所基本科研业务费专项项目(Y415014) 江西省水利厅科技项目(KT201414,KT201606)
【分类号】：TV431

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