纤维增强混凝土材料抗冲击荷载试验研究

Experimental Study on Impact Resistance of Fiber Reinforced Concrete Specimens

普通混凝土易开裂,韧性较差。文中主要通过混凝土抗冲击试验,研究了在普通混凝土中掺入不同长度的合成聚丙烯纤维及聚丙烯腈纤维,以改善混凝土的脆性性能,提高混凝土的韧性。试验中在混凝土中分别掺入长度为20mm合成聚丙烯纤维、40mm合成聚丙烯纤维及单丝聚丙烯腈纤维,每种纤维掺量分别为1kg/m^(3),3kg/m^(3),6kg/m^(3),9kg/m^(3),通过改变纤维掺量研究不同掺量下合成纤维对混凝土抗冲击荷载的影响规律。实验研究结果表明纤维混凝土的抗冲击性能随纤维掺量提高显著提升,纤维含量为9kg/m^(3)的40mm聚丙烯纤维混凝土试件其抗冲击韧性最好,相较于普通混凝土的抗冲击韧性提高了306.67%。

Thenormal concrete is easy to crack and its toughness is poor.In this paper,different lengths of synthetic polypropylene fiber and polyacrylonitrile fiber are mixed into normal concrete to improve the brittleness and toughness of concrete.Through the concrete impact test device,the drop weight impact test was carried out on the cube specimens of synthetic polypropylene fiber concrete,polyacrylonitrile fiber concrete and ordinary concrete.In the experiment,20 mm synthetic polypropylene fiber,40 mm synthetic polypropylene fiber and monofilament polyacrylonitrile fiber were added into the concrete,respectively.The influence of synthetic fiber on the impact load of concrete was studied by changing the fiber content.The content of each fiber was 1 kg/m^(3),3kg/m^(3),6kg/m^(3),9kg/m^(3).The experimental results show that the impact resistance of fiber reinforced concrete increases significantly with the increase of fiber content.The impact toughness of fiber reinforced concrete with 40mm length and 9 kg/m^(3) synthetic polypropylene fiber is the best,which is 306.67%higher than that of normal concrete.