提高管桩混凝土抗裂性的试验研究  

Experiment of improving crack-resistance of pile concrete

作　　者：张风臣[1] 艾玲玲[1] 朱克平 汤永柳 朱加刚 

机构地区：[1]河海大学力学与材料学院,江苏南京210098 [2]宿迁市固丰管桩有限公司,江苏宿迁223800

出　　处：《新型建筑材料》2010年第11期18-21,共4页New Building Materials

基　　金：江苏省自然科学基金(BK2009754)

摘　　要：为减少预应力混凝土管桩施工过程发生桩顶破碎、桩身断裂现象,从混凝土材料角度出发,探讨了提高管桩混凝土抗裂性的措施。结果表明,单掺20%矿粉或20%粉煤灰,脱模抗压强度能够满足GB13476—2009对预应力混凝土管桩钢筋放张时的强度要求,提高管桩混凝土的抗裂性,改善其脆性,且掺入矿粉的效果优于粉煤灰;单掺20%矿粉或20%粉煤灰后再复掺3%～8%的硅灰,混凝土的抗压强度和劈裂抗拉强度都得到提高,但其脆性大于单掺20%矿粉的混凝土。In order to reduce the phenomenon of top crack and body rupture during prestressed concrete pile construction, measures for improving crack-resistance of pile concrete are studied from the concrete material. Experimental results show that incorporating 20% blast furnace slag or fly ash, demoulded compressive strength can stratify the national standard （GB 13476-- 2009） about prestressed concrete pile,and improve crack-resistance and brittleness of pile concrete. Furthermore the effect of slag precedes that of fly ash. When incorporating 20% blast furnace slag or fly ash and adding 3%-8% silica fume,demoulded compressive strength and tensile-splitting strength are increased,but brittleness are higher than that with only 20% blast furnace slag.

关 键 词：管桩混凝土 矿粉 粉煤灰 硅灰 抗裂性 脆性 

分 类 号：TU528.571[建筑科学—建筑技术科学]