摘要
中国高性能混凝土的强度等级一般为Ｃ６０。Ｃ８０的高性能混凝土在试点工程中也得到了应用。中国高性能混凝土具有以下特色：（１）矿物质超细粉生产与应用：包括矿渣、磷渣、天然沸石、粉煤灰等，比表面积６０００～８０００ｃｍ２／ｇ。以粉体取代混凝土中的部分水泥，改善混凝土的和易性，提高耐久性和强度。（２）载体效应的利用与坍落度损失的控制：利用无机粉体为载体，吸附高效减水剂与缓凝剂；将这种吸附了高效减水剂的粉体，再与混凝土一起拌合时，能缓慢地将减水剂释放到混凝土拌合物中，控制坍落度在１．５～２．０ｈ无损失。（３）电化学方法的有效应用：通过电化学方法测定Ｃｌ－在ＨＰＣ中的扩散系数，检测ＨＰＣ中的钢筋锈蚀，以及对钢筋的电化学保护等。为了进一步提高ＨＰＣ的性能，中国正在努力解决ＨＰＣ由于自收缩引起的裂纹及进一步水化引起的裂纹，以及解决其脆性等问题。
The strength grade of high concrete performance (HPC)is generally C60 in China.HPC with 80MPa has also been used tentatively in some structures.HPC in China has following characteristics:(1)Research and application of mineral superfine powders.Silica fume as well as other kinds of superfine powders,which with specific surface area 6000～8000cm2/g are made of blastfurnace slag,phosphorous slag,and natural zeolite etc.are mixed in concrete to replace a part of cement improving the workability of fresh concrete and the durability and strength of hardened concrete.(2)Application of carrier effect and controlling slump loss.Some kinds of inorganic powders can act as carriers to absorb superplasticizer and retarder (CSR).When CSR is added to concrete,it can release the admixtures gradually to remain the concentration of superplasticizer and retarder in fresh concrete.So the surface Zeta potential of cement particle is kept and the slump loss is controlled.(3)Efficient application of electronicchemistry.The methods of electronicchemistry are adopted in measuring the diffusion coefficient of chlorhydric ions in HPC,testing the steel corrosion and protecting the reinforcement.In order to go further into a improvement of properties of HPC,many researchers in China are working hard to deal with the problems including the autogeniousshrinkage crack,continued hydration crack and the brittleness of HPC.
出处
《济南大学学报（自然科学版）》
CAS
1998年第S1期3-7,共5页
Journal of University of Jinan(Science and Technology)
