木质纤维在混凝土中的抗裂性应用研究

本文以木质纤维FI400C和国内另外一种混凝土专用木质纤维为例,运用平板抗裂法对两种木质纤维在混凝土中的抗裂性进行对比试验。研究发现,FI400C木质纤维不增加配方的需水量,在水中易分散,可以显著提高混凝土的抗裂性。同时发现木质纤维对混凝土的吸水率和抗压强度基本没有影响,并分析阐明了木质纤维对混凝土抗裂性性能影响的机理。同时本文对比研究了PP纤维与FI400C在泡沫混凝土中的分散性和抗裂性对比试验,与PP纤维对比,FI400C具有更好的分散均匀性,同时FI400C在泡沫混凝土中同样具有出色的抗裂性,更为重要的是可以降低泡沫混凝土的干容重,对泡沫混凝土的其他物理性能基本没有影响。

Investigation on cracking-resistance of fiber cellulose applying in concrete

Based on Flat cracking-resistance,two different types of fiber cellulose are applied in concrete to compare cracking-resistance of concrete with fiber cellulose.FI400C,which is easy to disperse even in water,can increase cracking-resistance of concrete without any increase of water demand for concrete formulation.At the same time,fiber cellulose has little effects on water absorption and compress strength of concrete.The influencing mechanism of fiber cellulose on concrete is analyzed and explained.Also the comparing dispersing performance and crack-resistance test of PP fiber and FI400C in foamed concrete is studied in this paper,FI400C owns better dispersing performance and gives better crack-resistance of foamed concrete even decreases density of foamed concrete but has no bad influence on physical performance of foamed concrete.