炉渣基地聚合物抗压强度及微观结构研究
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摘要
为研究炉渣在地聚合物中应用,将磨细炉渣和偏高岭土按1∶1的质量比混合后作为地聚合物原材料,以水玻璃、氢氧化钠为激发剂制备地聚合物材料,研究了碱当量、激发剂模数和养护条件对炉渣基地聚合物抗压强度的影响,并利用XRD、SEM分析地聚合物的微观结构。结果表明:随着激发剂模数和碱当量的增大,炉渣基地聚合物的抗压强度呈先提高后降低的趋势;高温养护有利于地聚合物抗压强度的提高,养护温度过高则会导致抗压强度下降,且适当延长养护时间会大大提高地聚合物的抗压强度。微观分析表明,炉渣基地聚合反应产物为絮状凝胶物质,呈非晶态或半晶态,且炉渣参与了地聚合反应。
To research the utilization of bottom ash,geopolymers were synthetized from bottom ash and metakaolin with equal proportion,using sodium hydroxide(NaOH) and sodium silicate(Na_2SiO_3)solutions as activators. The influence of silica modulus,activator dosage and cure conditions on the compressive strength of bottom ash-metakaolin based geopolymers were explored. The microstructure was characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM). The results show that with the increase of silica modulus and activator dosage,the compressive strength of geopolymers increases first and then decreases. High temperature curing is beneficial for the development of compressive strength,but if too high,it will lead to a decrease. Prolonged curing time will greatly promote the compressive strength of the geopolymer. Microscopic analysis indicates that the bottom ash participates in geopolymerization and the geopolymer material is composed of amorphous phase and semi-crystalline phase.
To research the utilization of bottom ash,geopolymers were synthetized from bottom ash and metakaolin with equal proportion,using sodium hydroxide(NaOH) and sodium silicate(Na_2SiO_3)solutions as activators. The influence of silica modulus,activator dosage and cure conditions on the compressive strength of bottom ash-metakaolin based geopolymers were explored. The microstructure was characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM). The results show that with the increase of silica modulus and activator dosage,the compressive strength of geopolymers increases first and then decreases. High temperature curing is beneficial for the development of compressive strength,but if too high,it will lead to a decrease. Prolonged curing time will greatly promote the compressive strength of the geopolymer. Microscopic analysis indicates that the bottom ash participates in geopolymerization and the geopolymer material is composed of amorphous phase and semi-crystalline phase.
引文
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[2]张书政,龚克成.地聚合物[J].材料科学与工程学报,2003(3):430-436.
[3]Swanepoel J C,Strydom C A.Utilisation of fly ash in a geopolymeric material[J].Applied Geochemistry,2002,17(8):1143-1148.
[4]汪海风,卢建磊,徐意,等.建筑垃圾制备地聚合物基泡沫混凝土研究[J].新型建筑材料,2016,43(10):73-75.
[5]Allahverdi A,Kani E N.Construction wastes as raw materials for geopolymer binders[J].International Journal of Civil Engineering,2009,7(3):154-160.
[6]孙俊民.燃煤固体产物的矿物组成研究[J].矿物学报,2001,21(1):14-18.
[7]沈立锋,徐辉,万小娇,等.循环流化床燃烧底渣制备地聚合物的试验研究[J].粉煤灰综合利用,2009(6):28-31.
[8]Cheriaf M,Rocha J C,Péra J.Pozzolanic properties of pulverized coal combustion bottom ash[J].Cement&Concrete Research,1999,29(9):1387-1391.
[9]Chindaprasirt P,Chai J,Chalee W,et al.Comparative study on the characteristics of fly ash and bottom ash geopolymers[J].Waste Management,2009,29(2):539-543.
[10]Ilker Bekir Top觭u,Toprak M U.Properties of geopolymer from circulating fluidized bed combustion coal bottom ash[J].Materials Science&Engineering A,2011,528(3):1472-1477.
[11]Haq E U,Padmanabhan S K,Licciulli A.Synthesis and characteristics of fly ash and bottom ash based geopolymers-A comparative study[J].Ceramics International,2014,40(2):2965-2971.
[12]Fernández-Jiménez A,Palomo A.Composition and microstructure of alkali activated fly ash binder:Effect of the activator[J].Cement&Concrete Research,2005,35(10):1984-1992.
[13]彭晖,李树霖,蔡春声,等.偏高岭土基地质聚合物的配合比及养护条件对其力学性能及凝结时间的影响研究[J].硅酸盐通报,2014,33(11):2809-2817..
[14]Kumar M L,Revathi V.Metakaolin bottom ash blend geopolymer mortar-A feasibility study[J].Construction&Building Materials,2016,114:1-5.
[15]郭晓潞,施惠生,夏明.不同钙源对地聚合物反应机制的影响研究[J].材料研究学报,2016,30(5):348-354.
[16]Rees C A,Provis J L,Lukey G C,et al.In situ ATR-FTIRstudy of the early stages of fly ash geopolymer gel formation[J].Langmuir the Acs Journal of Surfaces&Colloids,2007,23(17):9076-9082.
[17]郑娟荣,刘丽娜.养护温度对偏高岭土基地质聚合物凝结硬化性能的影响[J].郑州大学学报(工学版),2007,28(4):1-3.
[18]李款,卢都友,李孟浩,等.水用量对偏高岭土基地聚合物微观结构及反应过程的影响[J].硅酸盐学报,2016(2):226-231.