粉煤灰对再生建筑石膏性能的影响
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摘要
实验室模拟再生石膏的生成条件制备出含粉煤灰的再生二水石膏样品,对经煅烧后得到含粉煤灰的再生建筑石膏进行了力学性能实验,并进而研究了粉煤灰对再生建筑石膏性能的影响及其作用机理。结果表明,相比未掺粉煤灰的原生建筑石膏(POP)而言,掺粉煤灰原生建筑石膏(POAP)的需水量降低,56d强度增加;相比未掺粉煤灰的再生建筑石膏(R-P),掺粉煤灰的再生建筑石膏(RAP)的标稠需水量降低,56d强度变化不大,但它的凝结时间却延长,2h强度逐渐降低。相比POP和POAP,R-P与R-AP的力学性能均降低,且R-AP的抗压、抗折强度降幅更大。由于粉煤灰的不完全水化,使得再生建筑石膏中依旧含有部分未水化的粉煤灰,它会在后期继续水化,从而使再生建筑石膏56d强度基本不变。
The recycled gypsum samples containing fly ash were prepared in laboratory by simulating the formation conditions of recycled gypsum.Then the samples were calcined to recycled plaster and progressed to the mechanical properties testing of their hardened pastes.The influence of fly ash on the properties of recycled plaster and its mechanisms were investigated.The results show that the water requirement is decreased and its56 dstrength is increased by the addition of fly ash in the plaster of Paris(POAP)relative to the plaster of Paris(POP).However,the fly ash has a very limited influence on 56 dstrength of the fly ash added fly ash added recycled plaster(R-AP),even though the water demand is decreased as well,the setting time is prolonged and2 hstrength is reduced compared with the pure recycled plaster(R-P).The properties of R-P and R-AP are both decreased compared with POP and POAP,while the strength of R-AP is dropped even much compared with that of R-P.The analysis indicates the 56 dstrength of recycled plaster is essentially kept by the hydration of the unhydrate fly ash in plaster of Paris due to its low hydration activity.
The recycled gypsum samples containing fly ash were prepared in laboratory by simulating the formation conditions of recycled gypsum.Then the samples were calcined to recycled plaster and progressed to the mechanical properties testing of their hardened pastes.The influence of fly ash on the properties of recycled plaster and its mechanisms were investigated.The results show that the water requirement is decreased and its56 dstrength is increased by the addition of fly ash in the plaster of Paris(POAP)relative to the plaster of Paris(POP).However,the fly ash has a very limited influence on 56 dstrength of the fly ash added fly ash added recycled plaster(R-AP),even though the water demand is decreased as well,the setting time is prolonged and2 hstrength is reduced compared with the pure recycled plaster(R-P).The properties of R-P and R-AP are both decreased compared with POP and POAP,while the strength of R-AP is dropped even much compared with that of R-P.The analysis indicates the 56 dstrength of recycled plaster is essentially kept by the hydration of the unhydrate fly ash in plaster of Paris due to its low hydration activity.
引文
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[2]ZHOU J,SHU Z,LI T T,et al.Novel fabrication route for nonfired ceramic tiles only using gypsum[J].Ceramic International,2015,41(7):9193~9198.
[3]ZHOU J,SHENG Z M,LI T T,et al.Preparation of hardened tiles from waste phosphogypsum by a new intermittent pressing hydration[J].Ceramic International,2016,42(6):7237~7245.
[4]葛静冉,彭家惠,彭志辉,等.水分对模具石膏性能及微观结构的影响[J].材料科学与工程学报,2016,34(3):413~416.
[5]Suarez S,Roca X,et al.Product-specific life cycle assessment of recycled gypsum as a replacement for natural gypsum in ordinary Portland cement:application to the Spanish context[J].Journal of Cleaner Production,2016,117:150~159.
[6]Chandara C,Azizi K A M,Ahmad Z,et al.Use of waste gypsum to replace natural gypsum as set retarders in Portland cement[J],Waste Management,2009,29(5):1675~1679.
[7]Ahmed A.Compressive strength and microstructure of soft clay soil stabilized with recycled bassanite[J].Applied Clay Science,2015,104(104):27~35.
[8]Ahmed A,Ugai K,et al.Investigation of recycled gypsum in conjunction with waste plastic trays for ground improvement[J].Construction and Building Materials,2011,25(1):208~217.
[9]Kamei T,Ahmed A,Shibi T.The use of recycled bassanite and coal ash to enhance the strength of very soft clay in dry and wet environmental conditions[J].Construction and Building Materials,2013,38(1):224~235.
[10]ZHANG L Z,Anthony S A,YU H N.Application of RFID and Mobile Technology to Plaster Board Waste in the Construction Industry[M].Croatia:INTECH Open Access Publisher,2011:157~158.
[11]Bergersen O,Haarstad K.Treating landfill gas hydrogen sulphide with mineral wool waste(MWW)and rod mill waste(RMW)[J].Waste Management,2014,34(1):141~147.
[12]López A,Lobo A.Emissions of C&D refuse in landfills:a European case[J].Waste Management,2014,34(8):1446~1454.
[13]Carvalho M T M,Leles M I G,Tubino R M C.TG and DSCstudies on plaster residues as recycled material[J].Journal of Thermal Analysis and Calorimetry,2008,91(2):621~625.
[14]Bardella P S,Camarini G.Recycled plaster:physical and mechanical properties[C].4th International Conference on Technology of Architecture and Structure,Xian,2011.09.Advanced Materials Research,Swizerland:Trans Tech Publicaitons,2012:1307~1310.
[15]Camarini G,Pinheiro S M M,Tannous K.Thermal Analysis of Recycled Gypsum from Construction and Demolition Waste[C].2012 Asian Pacific Conference on Energy,Swizerland:Trans Tech Publicaitons,2012:977~980.
[16]Camarini G,Pinheiro S M M.Microstructure of recycled gypsum plaster by SEM[C].2014International Conference on Frontiers of Advanced Materials and Engineering Technology,HongKong,2014.03.Advanced Materials Research,Swizerland:Trans Tech Publicaitons,2014:243~246.
[17]任利纳.再生石膏性能变化规律及原因[D].重庆:重庆大学,2014.
[18]邱星星,彭家惠,李志新,等.聚羧酸减水剂对再生石膏性能的影响[J].材料科学与工程学报,2016,34(3):362~366.
[19]田广科,石宗利.影响石膏粉煤灰复合墙体材料性能的因素及机理研究[J].新型建筑材料,2005(7):16~18.
[20]姚源.脱硫石膏-粉煤灰胶凝体系性能研究[D].西安:西安建筑科技大学,2014.
[21]林芳辉,彭家惠,季建新,以粉煤灰为改性组份的石膏粉煤灰胶结材研究[J].粉煤灰综合利用,1997(3):27~32.
[22]张翼.烟气脱硫石膏-粉煤灰墙体材料研究[D].宁波:宁波大学,2011.
[23]李志新,彭家惠,戎廷团,等.FDN减水刘对再生石膏性能的影响[J].建筑材料学报,2016,19(1):83~87.
[24]叶青青.颗粒级配对α半水石膏水化和强度的影响[D].杭州:浙江大学,2010.
[25]张佳莉,叶青青,吴忠标,等.三聚氰胺减水剂对α半水石膏水化硬化过程的影响[J].浙江大学学报(理学版),2009,36(3):318~322.