Durability of High Performance Concrete

在这项研究中，高性能混凝土，这具有相对正常的强度，耐久性进行了检查。主要研究结果如下：（1）高性能混凝土的干缩应变略大于普通混凝土，但不受石灰石粉取代率和水灰比的影响。这可能是由于石灰石粉的加入改变了孔隙结构。徐变应变和徐变系数与水灰比无关，与普通混凝土的徐变应变和徐变系数基本相同。(2)高性能混凝土除含气量为3.0%的混凝土外，其抗冻融性能较好。13EA04：（3）在石灰石粉和水粉比较小的情况下，高性能混凝土与钢筋界面区维氏硬度值较大，可能是泌水量较小所致。高性能混凝土与钢筋之间的粘结强度与浇筑时钢筋的方向无关。

In this study, durability of high performance concrete, which has relatively normal strength, was examined. Main results obtained are as follows :(1) Strain of drying shrinkage of high performance concrete was not affected by replacement ratio of lime stone powder and water cement ratio, although it was a little larger than that of ordinary concrete. It may be caused by change in pore structure due to lime stone powder addition. Creep strain and creep coefficient were also almost constant regardless of water cement ratio, which were almost the same as those of ordinary concrete.(2) Hight performance concrete showed preferable freeze thaw resistance except for that with 3.0% of air content. Influence of the agent which gives high viscosity was not significant.13EA04 : (3) Vickers hardness of interfacial zone of high performance concrete and steel bar showed large values in case that lime stone powder was used and water powder ratio was small, which may be caused by small bleeding. Bond strength between high performance concrete and steel bar was almost the same regardless of the direction of steel bar when casting.