外加剂对疏浚底泥免烧裹壳骨料抗冻性能的影响
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摘要
研究了外加剂对疏浚底泥免烧裹壳骨料(WSLAs)抗冻性能的影响,采用甘油、蔗糖、白乳胶、聚丙烯酰胺4种外加剂对免烧骨料进行裹壳处理制得WSLAs-G、WSLAs-S、WSLAs-W、WSLAs-A。对4种WSLAs的堆积密度、筒压强度、吸水性和抗冻性等性能进行表征与对比分析,并阐述了影响机理。结果表明:蔗糖作为外加剂制备WSLAs,能明显改善骨料壳层结构,提升骨料性能。在强度方面,WSLAs-S最高,其筒压强度可达9.08 MPa。WSLAs-S壳层结构密实、孔隙较少,其1 h吸水率为8.13%,表现出较好的抗冻性能,经30次冻融循环后质量损失率仅为5.69%。
In order to explore the effect of admixture on the antifreeze performance of unburned wrap shell aggregates(WSLAs) prepared by dredged sediment,WSLAs-G,WSLAs-S,WSLAs-W,and WSLAs-A were prepared by shelling an unburned aggregate with four admixtures:glycerin,sucrose,white latex,and polyacrylamide. Characterize and contrast the packing density,cylinder compressive strength,water absorption and frost resistance of the four types of WSLAs and elaborate the influencing mechanism.The results show that,sucrose used as admixture to prepare WSLAs can significantly improve the outer shell structure of aggregates and improve the performance of WSLAs. In terms of strength,WSLAs-S are superior,and their cylinder compressive strength can reach 9.08 MPa. At the same time,the shell structure of WSLAs-S is denser and less porous. The water absorption rate of 1 h was only 8.13%,and it showed better frost resistance. After 30 freeze-thaw cycles,the mass loss rate was only 5.69%.
In order to explore the effect of admixture on the antifreeze performance of unburned wrap shell aggregates(WSLAs) prepared by dredged sediment,WSLAs-G,WSLAs-S,WSLAs-W,and WSLAs-A were prepared by shelling an unburned aggregate with four admixtures:glycerin,sucrose,white latex,and polyacrylamide. Characterize and contrast the packing density,cylinder compressive strength,water absorption and frost resistance of the four types of WSLAs and elaborate the influencing mechanism.The results show that,sucrose used as admixture to prepare WSLAs can significantly improve the outer shell structure of aggregates and improve the performance of WSLAs. In terms of strength,WSLAs-S are superior,and their cylinder compressive strength can reach 9.08 MPa. At the same time,the shell structure of WSLAs-S is denser and less porous. The water absorption rate of 1 h was only 8.13%,and it showed better frost resistance. After 30 freeze-thaw cycles,the mass loss rate was only 5.69%.
引文
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[2] Erftemeijer P L A,Riegl B,Hoeksema B W,et al.Environmental impacts of dredging and other sediment disturbances on corals:A review[J].Marine Pollution Bulletin,2012,64(9):1737-1765.
[3]姬凤玲,吕擎峰,马殿关.沿海地区废弃疏浚淤泥的资源化利用技术[J].安徽农业科学,2007,35(15):4593-4595.
[4] Nakouzi S,Mielewski D,Ball J,et al.A novel approach to paint sludge recycling:Reclaiming of paint sludge components as ceramic composites and their applications in reinforcement of metals and polymers[J].Journal of Materials Research,1998,13(1):53-60.
[5] Devant M,CusidóJ A.Custom formulation of red ceramics with clay,sewage sludge and forest waste[J].Applied Clay Science,2011,53(4):669-675.
[6] Cheeseman C R,Sollars C J.Properties,microstructure and leaching of sintered sewage sludge ash[J].Resources,Conservation&Recycling,2003,40(1):13-25.
[7]祝建中,陈冠寰,史海波,等.一种淤泥固化免烧造粒处理方法:CN 103910503A[P].2014-07-09.
[8]陈德玉,刘欢,唐凯靖.再生骨料混凝土的抗冻性研究[J].施工技术,2011,40(11):58-61.
[9]杨鹏乾,安新茹,彭瑜洲,等.疏浚底泥免烧裹壳骨料混凝土路面砖的性能研究[J].新型建筑材料,2018(7):93-97.
[10]吴燕,周颜,贾瑞,于浩.一种掺加疏浚底泥制备免烧陶粒的方法:CN105036691A[P].2015-11-11.
[11]彭瑜洲,杨鹏乾,吴燕.外加剂对疏浚底泥裹壳骨料性能的影响[J].环境工程学报,2018(3):966-974.
[12] Peng X,Zhou Y,Jia R,et al.Preparation of non-sintered lightweight aggregates from dredged sediments and modification of their properties[J].Construction&Building Materials,2017,132:9-20.
[13]沈新元.白乳胶水泥混凝土路用性能研究[J].交通运输研究,2008(5):94-96.
[14]马保国,张莉,张平均,等.蔗糖对水泥水化历程的影响[J].硅酸盐学报,2004,32(10):1285-1288.
[15] David M.Mechanism of vinyl acetate emulsion polymerization[J].Journal of Polymer Science Part A Polymer Chemistry,2010,32(125):395-411.