建筑垃圾的活性激发及制备蒸养砖
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摘要
为实现建筑垃圾的资源化利用,采用SEM、XRF、XRD等分析测试技术,研究了建筑垃圾微粉的颗粒形貌、化学成分、矿物组成等相关性质。选用Ca(OH)_2、Na_2SO_4、CaCl_2为激发剂,在相同条件下激发建筑垃圾的活性,以建筑垃圾为主要原料,采用压制成型的方法制备蒸压砖,以蒸养砖的强度来评价激发效果。结果表明:Ca(OH)_2激发效果较好,建筑垃圾总用量达到90%,制备的蒸压砖强度达到MU15等级。
In this paper,to achieve the effective utilization of construction waste,the morphology,chemical composition and mineral composition of the construction waste powder were investigated by means of SEM,XRF and XRD. Ca(OH)_2,Na_2SO_4 and CaCl_2 were chosen to activate the construction waste and their activating effect was quantified by strength of the autoclaved bricks made with different activators under the same condition. The results showed that Ca( OH)_2 was the preferable activator with the highest performance.The bricks can be produced via pressure molding method,using construction waste powder as the starting materials. The dosage of building waste can be as high as 90%. The strength of autoclaved brick met the technical requirements of grade MU15.
In this paper,to achieve the effective utilization of construction waste,the morphology,chemical composition and mineral composition of the construction waste powder were investigated by means of SEM,XRF and XRD. Ca(OH)_2,Na_2SO_4 and CaCl_2 were chosen to activate the construction waste and their activating effect was quantified by strength of the autoclaved bricks made with different activators under the same condition. The results showed that Ca( OH)_2 was the preferable activator with the highest performance.The bricks can be produced via pressure molding method,using construction waste powder as the starting materials. The dosage of building waste can be as high as 90%. The strength of autoclaved brick met the technical requirements of grade MU15.
引文
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[13]方军良,陆文雄,徐彩宣.粉煤灰的活性激发技术及机理研究进展[J].上海大学学报(自然科学版),2002,8(3):255-260.
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[16]王智,郑洪伟,钱觉时,等.硫酸盐对粉煤灰活性激发的比较[J].粉煤灰综合利用,1999(3):15-18.
[17]Shi C,Day R L.Chemical activation of blended cements made with lime and natural pozzolans[J].Cement and Concrete Research,1993,23(6):1389-1396.
[2]孙金坤,欧先军,马海萍,等.建筑垃圾资源化处理工艺改进研究[J].环境工程,2016,34(12):103-107.
[3]张利军.西安市建筑垃圾渣土资源再利用研究[J].环境工程,2017,35(5):122-124.
[4]Khalaf F M,Devenny A S.Use of aggregate from recycled construction and demolition waste in concrete[J].Resources,Conservation&Recycling,2006,50(1):71-81.
[5]Khatib J M.Properties of concrete incorporating fine recycled aggregate[J].Cement and Concrete Research,2005,35(4):763-769.
[6]Khalaf F M,Devenny A S.Recycling of demolished masonry rubble as coarse aggre-gate in concrete:review[J].Journal of Materials in Civil Engineering,2004,16(4):331-340.
[7]Khalaf F M,Devenny A S.Performance of brick aggregate concrete at high tempera-tures[J].Journal of Materials in Civil Engineering,2004,16(6):56-65.
[8]Lee S T,Swamy R N,Kim S S,et al.Durability of Mortars made with recycled fine aggregates exposed to sulfate solutions[J].Journal of Materials in Civil Engineering,2008,20(1):63-70.
[9]刘小艳,金丹,刘开琼,等.掺再生微粉混凝土的早期抗裂性能[J].建筑材料学报,2010,13(3):398-401.
[10]李琴,张春红,孙可伟.不同激发剂激发建筑垃圾再生微粉活性研究[J].硅酸盐通报,2016,35(7):2187-2192.
[11]孙丽蕊.再生微粉材性及其对再生制品影响的研究[D].北京:北京建筑工程学院.2012:23-59.
[12]吴姝娴,左俊卿.再生微粉掺合料的制备及性能研究[J].山西建筑,2011,37(25):122-124.
[13]方军良,陆文雄,徐彩宣.粉煤灰的活性激发技术及机理研究进展[J].上海大学学报(自然科学版),2002,8(3):255-260.
[14]Shi C,Day R L.Early strength development and hydration of alkali-activated blast furnace slag/fly ash blends[J].Advances in Cement Research,1999,11(4):189-196.
[15]高剑平,潘景龙.新旧混凝土结合面成为受力薄弱环节原因初探[J].混凝土,2000(6):44-46.
[16]王智,郑洪伟,钱觉时,等.硫酸盐对粉煤灰活性激发的比较[J].粉煤灰综合利用,1999(3):15-18.
[17]Shi C,Day R L.Chemical activation of blended cements made with lime and natural pozzolans[J].Cement and Concrete Research,1993,23(6):1389-1396.