| 1,223 | 96 | 112 |
| 下载次数 | 被引频次 | 阅读次数 |
高延性水泥基复合材料(high ductility cementitious composites,HDCC)是一种具有应变硬化、多缝开裂和高延性等特性的新型纤维增强水泥基复合材料,其材料设计必须取得基体韧度、界面黏结和纤维特性三者的最优组合,因此,HDCC的制备必须优选原材料和优化配合比,以取得最优的材料制备技术。从配合比设计入手,研究了粉煤灰含量、胶砂比等对HDCC力学性能的影响,优化了特定材料下的材料制备技术。结果表明:粉煤灰含量、胶砂比和养护条件对HDCC的拉伸性能均具有较大的影响。随着粉煤灰掺量的增大,砂含量的降低,拉伸应变增大。当砂含量较高时,基体开裂韧度较高,基体的极限拉伸应力下对应的极限拉伸应变较小,然而随着应力的下降,复合材料仍然能维持相当大的应变。
Abstract：A high ductility cementitious composite (HDCC) is a developed sort of fiber reinforced composite with strain-hardening behavior, multi-crack and high ductility. To prepare the HDCC, it is necessary to optimize the mixture proportion and to gain the optimum combination of the toughness of matrix, interface properties and fiber performance. The effect of fly-ash content and the ratio of binder to sand on the properties of the HDCC were investigated based on the mixture design. The results show that fly-ash content, ratio of binder to sand and curing condition have an influence on the tensile properties of the HDCC. The tensile strain increases with the increasing of fly ash content and the decreasing of sand content. For the matrix with relative high crack toughness, the ultimate tensile strain of the HDCC is smaller, but the large strain can be maintained with the tardily descending stress.
[1]LI V C.From micromechanics to structural engineering-the design of cementitious composites for civil engineering applications[J].J Struct Mech Earthquake Eng,1993,10(2):37–48.
[2]KANDA T,LI V C,ASCE M.New micromechanics design theory for pseudostrain hardness cementitous composite[J].J Eng Mech,1999,125(4):373–381.
[3]LI V C,MISHRA D K,WU H C.Matrix design for pseudo-strain-hardening fiber reinforced cementitious composites[J].Mater Struct,1995,28:586–595.
[4]LI V C,LEUNG C K Y.Steady-state and multiple cracking of short random fiber composites[J].J Eng Mech,1992,118(11):2246–2264.
[5]LI V C,WANG S.Process for increasing the ductility of high per-formance fiber-reinforced brittle matrix composites and composites produced thereby[P].US Patent7169224.2007–01–30.
[6]REDON C,LI V C,ASCE M,et al.Measuring and Modifying Inter-face Properties of PVA fibers in ECC matrix[J].ASCE J Mater Civil Eng,2001,13(6):399–406.
[7]LI V C,WU C,WANG S,et al.Interface tailoring for strain-hardening polyvinyl alcohol-engineered cementitious composite[J].ACI Mater J,2002,99(5):463–472.
[8]KANDA T,LI V C.Interface property and apparent strength of high-strength hydrophilic fiber in cement matrix[J].J Mater Civil Eng,1998,10(1):5–13.
[9]陈婷.高强高弹PVA纤维增强水泥基材料的研制与性能[D].合肥:合肥工业大学,2004.CHEN Ting.Production and properties of cementitious composites with high-strength and high modulus PVA-fiber reinforcement in Chi-nese,dissertation),Hefei:Hefei University of Technology,2004.
[10]张君,公成旭.高韧性纤维增强水泥基复合材料单轴抗拉性能研究[A]//纤维混凝土的技术进展与工程应用–第十一届全国纤维混凝土学术会议[C].大连,2006:27–32.ZHANG Jun,GONG Chengsu,Tension behavior of high ductile fiber reinforced cementitious composites[A]//Application and technical development of fiber reinforced concrete[C].Dalian,China,2006:27–32.
[11]姜国庆,刘小泉,孙伟,等.高性能特种水泥基复合材料的关键技术与力学行为研究[J].建筑技术,2007(3):228–230.JIANG Guoqing,LIU Xiaoquan,SUN Wei,et al.Architecture technol(in Chinese),2007(3):228–230.
[12]WANG S,LI V C.Engineered cementitious composites with high-volume fly ash[J].ACI Mater J,2007,104(3):233–241.
[13]吴李国.PVA纤维的应用现状及进展[J].现代纺织技术,2001,9(4):52–54.WU Liguo.Modern Textile Technol(in Chinese),2001,9(4):52–54.
[14]AKERS S A S,STUDINKA J B,MEIER P,et al,long term durability of PVA reinforcing fibers in a cement matrix[J].Inter J Cem Compos Lightweight Concr,1989,11:79–91.
基本信息:
中图分类号:TU528
引用信息:
[1]庞超明,LEUNG C K Y,孙伟.高掺量粉煤灰高延性水泥基复合材料的制备和性能[J].硅酸盐学报,2009,37(12):2071-2077.
基金信息:
国家“973”计划(2009CB623200);; 香港研究基金(CERGUST616405)资助项目
2009-12-15
2009-12-15