钢纤维和聚丙烯粗纤维对活性粉末混凝土强度和延性的影响

The effects of steel fiber and polypropylene coarse fiber on the compressive strength and ductility of metakaolin RPC

众所周知,混凝土强度越高,脆性越显著,特别是超高强度混凝土。本文就钢纤维和聚丙烯粗纤维对掺偏高岭土活性粉末混凝土抗压强度和延性的影响进行了研究,结果表明:掺入一定量的钢纤维,可以改善混凝土内部孔隙结构,延迟和阻碍裂缝的形成和发展,从而提高混凝土的抗压强度,改善混凝土的脆性;掺入一定量的聚丙烯粗纤维,混凝土强度不会提高,但具有改善混凝土脆性的作用。

It is well known that the higher strength of the concrete also means the higher degree of brittleness,expecially to super strength concrete.The paper carries out the research on the effecs of steel fiber and polypropylene coarse fiber on the compressive strength and ductility of Metakaolin PRC.The results prove as follows： If Metakaolin PRC is mixed with a certain amount of steel fibre,the inner hole structure can be improved to delay and prevent the forming and developing of cracks,which can increase the compressive strength of concrete and reduce its brittleness;if Metakaolin PRC is mixed with a certain amount of polypropylene coarse fiber,the strength of the concrete cannot be improved,but the brittleness can be lessened.