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本文对混凝土徐变性能进行了初步研究。试验表明,高强度混凝土线性徐变(应力/强度)比值较普通混凝土的有所提高。混凝土徐变不仅与应力水平有关,而且还受加载龄期的影响。不同加载龄期的混凝土徐变曲线并不具有沿t轴平行的性质。这恰与老化理论的假设相反。影响混凝土徐变的因素有内在的,也有外在的。作者以混凝土抗压强度作为诸内在因素对混凝土徐变影响的综合反映,提出了以徐变短期观测值预估混凝土长期徐变行为的公式。根据所收集的69组混凝土徐变试验数据看,所提预估公式具有令人满意的预测精度。
In this paper, a preliminary study of concrete creep properties. Tests show that the linear creep (stress / strength) ratio of high-strength concrete is higher than that of ordinary concrete. Concrete creep is not only related to the stress level, but also affected by loading age. Concrete creep curves at different loading ages do not have parallel properties along the t-axis. This is exactly the opposite of the assumption of aging theory. Factors that affect the creep of concrete are intrinsic and extrinsic. The author takes the concrete compressive strength as a comprehensive reflection of the internal factors on the impact of concrete creep, and puts forward the formula to predict the long-term creep behavior of concrete with short-term creep observations. According to the collected 69 sets of concrete creep test data, the proposed estimation formula has a satisfactory prediction accuracy.