灾后废旧水泥混凝土全再生利用技术研究
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摘要
为了完全再生利用灾后产生的大量废旧水泥混凝土(WCC),研究再生混凝土(RC)、水泥稳定水泥混凝土废料基层材料(CCBM)的物理力学性能、耐久性、结构及机理。结果表明:RC含气量可达4.7%,维勃稠度达10～15s,28d抗折、抗压强度分别在6MPa、56MPa以上,抗渗等级在S40以上,氯离子渗透性低。RC结构包括骨料、新、旧砂浆、骨料与新、旧砂浆过渡区、新旧砂浆过渡区六相,骨料新砂浆、新旧砂浆过渡区结构致密,骨料旧砂浆界面处有裂缝,通过骨料预吸水、掺粉煤灰和外加剂改善了RC的性能。4%、5%、6%、7%水泥剂量CCBM的7d无侧限抗压强度达3.01MPa、3.94MPa、4.75MPa和4.98MPa,5次冻融循环后CCBM的BDR值大于80%,满足道路基层强度和抗冻耐久性要求。因而,"RC+CCBM"全再生利用技术可对灾后大量WCC进行100%的资源化利用。关键词:灾后重建;废旧水泥混凝土;再生混凝土;水泥稳定水泥混凝土废料基层材料
In order to completely use the recycled vast post-disaster waste cement concrete(WCC),the physical and mechanical performance,durability,structure and mechanism of recycled concrete(RC) and cement stabilized cement concrete scrap base material(CCBM) were studied.The results showed that air content of RC can reach 4.7%,with Vb consistency beyond 10 ~ 15 s,flextural and compressive strength higher than 6 MPa and 56 MPa,respectively,at 28 d,anti-permeability rank exceeding S40,and low chlorinion permeability.The structure of RC includes aggregate,new and old mortar,transition zones among aggregate,new,old mortar,transition zones between aggregate and new mortar.The new and old mortarh have compact structure,and the interface between aggregate and new mortar has cracks.The performance of RC was improved by aggregate beforehand adsorbing water,mixing fly ash and agents.Non-side-restriction compressive strength of CCBM with 4%,5%,6%,and 7% cement can reach 3.01 MPa,3.94 MPa,4.75 MPa,4.98 MPa,respectively,at 7 d.The BDR of CCBM after 5 Freezethaw cycles was greater than 80%,which can meet strength and freeze resistance requirements of pavement base.Therefore,"RC + CCBM"complete recycled use technology can reuse vast post-disaster WCC completely.
In order to completely use the recycled vast post-disaster waste cement concrete(WCC),the physical and mechanical performance,durability,structure and mechanism of recycled concrete(RC) and cement stabilized cement concrete scrap base material(CCBM) were studied.The results showed that air content of RC can reach 4.7%,with Vb consistency beyond 10 ~ 15 s,flextural and compressive strength higher than 6 MPa and 56 MPa,respectively,at 28 d,anti-permeability rank exceeding S40,and low chlorinion permeability.The structure of RC includes aggregate,new and old mortar,transition zones among aggregate,new,old mortar,transition zones between aggregate and new mortar.The new and old mortarh have compact structure,and the interface between aggregate and new mortar has cracks.The performance of RC was improved by aggregate beforehand adsorbing water,mixing fly ash and agents.Non-side-restriction compressive strength of CCBM with 4%,5%,6%,and 7% cement can reach 3.01 MPa,3.94 MPa,4.75 MPa,4.98 MPa,respectively,at 7 d.The BDR of CCBM after 5 Freezethaw cycles was greater than 80%,which can meet strength and freeze resistance requirements of pavement base.Therefore,"RC + CCBM"complete recycled use technology can reuse vast post-disaster WCC completely.
引文
[1]Xiao Janzhuang,Lei Bin,Wang Changqing.Recycled products from concrete waste in Wenchuan Earthquake-hit Area[C]//The First National Academic Exchange Conference on the Research and Application of Recycled Concrete.Shanghai:Tongji University Press,2008:63-66.[肖建庄,雷斌,王长青.汶川地震灾区建筑废物的资源化利用[C]//首届全国再生混凝土研究与应用学术交流会.上海:同济大学出版社,2008:63-66.]
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[8]Tabsh S W,Abdelfatah A S.Influence of recycled concrete aggregate on strength properties of concrete[J].Construction and Building Materials,2009,23(2):1163-1167.
[9]Xiao Jianzhuang.Experimental investigation on complete stress-strain curve of recycled concrete under uniaxial loading[J].Journal of Tongji Universtity:Natural Science,2007,35(11):1445-1449.[肖建庄.再生混凝土单轴受压应力—应变全曲线试验研究[J].同济大学学报:自然科学版,2007,35(11):1445-1449.]
[10]Chen Liang,Chen Zhongfan.Research and application of recycled concrete[J].Concrete,2009,240(10):116-120.[陈亮,陈忠范.再生混凝土现状[J].混凝土,2009,240(10):116-120.]
[11]Zhang Chao.Reuse of scrap concrete slab in highway reconstruction[J].Journal of Traffic and Transportation,2003,3(4):5-9.[张超.废弃混凝土路面板在道路改建中的再利用[J].交通运输工程学报,2003,3(4):5-9.]
[12]Wan Huiwen,Yang Shuyang,Pan Zhisheng.Recycled technology of building waste and its application research in road sub-base[J].Science and Technology of Overseas Building Materials,2007,28(6):47-50.[万惠文,杨淑雁,潘智生.建筑废弃物再生工艺及在路基中的应用研究[J].国外建材科技,2007,28(6):47-50.]
[13]Park T.Application of construction and building debris as base and subbase materials in rigid pavement[J].Journal of Transportation Engineering,2003,129(50):558-563.
[14]Poon C S,Dixon Chan.Feasible use of recycled concrete aggregates and crushed clay brick as unbound road sub-base[J].Construction and Building Materials,2006,20(8):578-585.
[15]Cui Lu,Cahyadi J H.Permeability and pore structure of OPC paste[J].Cement and Concrete Research,2001,31(2):277-282.
[17]Hossain K M A,Lachemi M.Strength,durability and microstructual aspects of high performance valcanic ash concrete[J].Cement and Concrete Research,2007,37(5):759-766.
[2]张金喜.道路工程材料资源循环利用技术[M].北京:科学出版社,2008.
[3]住房和城乡建设部.地震灾区建筑废物处理技术导则[S].2008.
[4]Shi Xiaoshuang,Wang Qingyuan.A research review and application outlook of RAC from post-earthquake reconstruction[J].Journal of Sichuan University:Engineering Science Edition,2009,41(3):301-311.[石宵爽,王清远.从灾后重建探讨再生混凝土的研究现状及其应用发展[J].四川大学学报:工程科学版,2009,41(3):301-311.]
[5]Poon C S,Shui Z H,Lam L,et al.Influence of moisture states of natural and recycled aggregates on the slump and compressive strength of hardened concrete[J].Cement and Concrete Research,2004,34(1):31-36.
[6]Evangelista L,Brito J D.Mechanical behaviour of concrete made with fine recycled concrete aggregates[J].Cement and Concrete Composites,2007,29(5):397-401.
[7]Kilica A,Atis C D.The influence of aggregate type on the strength and abrasion resistance of high strength concrete[J].Cement and Concrete Composites,2008,30(4):290-296.
[8]Tabsh S W,Abdelfatah A S.Influence of recycled concrete aggregate on strength properties of concrete[J].Construction and Building Materials,2009,23(2):1163-1167.
[9]Xiao Jianzhuang.Experimental investigation on complete stress-strain curve of recycled concrete under uniaxial loading[J].Journal of Tongji Universtity:Natural Science,2007,35(11):1445-1449.[肖建庄.再生混凝土单轴受压应力—应变全曲线试验研究[J].同济大学学报:自然科学版,2007,35(11):1445-1449.]
[10]Chen Liang,Chen Zhongfan.Research and application of recycled concrete[J].Concrete,2009,240(10):116-120.[陈亮,陈忠范.再生混凝土现状[J].混凝土,2009,240(10):116-120.]
[11]Zhang Chao.Reuse of scrap concrete slab in highway reconstruction[J].Journal of Traffic and Transportation,2003,3(4):5-9.[张超.废弃混凝土路面板在道路改建中的再利用[J].交通运输工程学报,2003,3(4):5-9.]
[12]Wan Huiwen,Yang Shuyang,Pan Zhisheng.Recycled technology of building waste and its application research in road sub-base[J].Science and Technology of Overseas Building Materials,2007,28(6):47-50.[万惠文,杨淑雁,潘智生.建筑废弃物再生工艺及在路基中的应用研究[J].国外建材科技,2007,28(6):47-50.]
[13]Park T.Application of construction and building debris as base and subbase materials in rigid pavement[J].Journal of Transportation Engineering,2003,129(50):558-563.
[14]Poon C S,Dixon Chan.Feasible use of recycled concrete aggregates and crushed clay brick as unbound road sub-base[J].Construction and Building Materials,2006,20(8):578-585.
[15]Cui Lu,Cahyadi J H.Permeability and pore structure of OPC paste[J].Cement and Concrete Research,2001,31(2):277-282.
[17]Hossain K M A,Lachemi M.Strength,durability and microstructual aspects of high performance valcanic ash concrete[J].Cement and Concrete Research,2007,37(5):759-766.
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