碱激发钢渣-矿渣加气混凝土的制备研究
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摘要
分别采用标准养护及蒸汽养护方式,对以钢渣和矿渣为原材料、双氧水为发气剂的碱激发钢渣-矿渣加气混凝土进行养护,研究钢渣掺量、矿渣掺量、水玻璃模数、碱含量、水胶比和碱溶液温度对加气混凝土性能的影响,并利用X射线衍射(XRD),扫描电镜(SEM)和傅里叶变换红外光谱(FTIR)对加气混凝土的微观结构进行分析.结果表明:碱激发钢渣-矿渣加气混凝土的最佳配合比为钢渣掺量40%,矿渣掺量60%,水玻璃模数1.6,碱含量6%,水胶比0.42,碱溶液温度30℃,双氧水掺量分别为4%及8%;制备的2种制品(B06和B05级)的孔径分布主要为0.3～0.6mm和0.5～1.0mm,宏观孔多为圆形封闭孔;此外,采用不同养护方式的制品水化产物均为C-S-H凝胶和C-S-A-H凝胶,水化产物中没有Ca(OH)_2;当采用蒸汽养护时,B06级制品的物理力学性能均能达到GB 11968—2006《蒸压加气混凝土砌块》标准规定值.
Aerated concrete was prepared by alkali activated steel slag and blast furnace slag with hydrogen peroxide as air entraining agent. The influence factors on the performance of aerated concrete, including steel slag content, blast furnace slag content, molar ratio of water glass, alkali content, water-binder ratio and the alkali solution temperature were investigated. The microstructure was characterized by XRD, SEM and FTIR. Results show that to produce the aerated concrete with optimum properties, the content of steel slag is 40% with blast furnace slag of 60%, and molar ratio of water glass is 1.6, the alkali content is 6%, and water-binder ratio is 0.42, hydrogen peroxide content is 4% and 8%. The alkali solution temperature should be at 30℃. Pore size for B06 and B05 products are ranging from 0.3 to 0.6 mm and from 0.5 to 1.0 mm, and the pore are mostly closed holes with a uniform circular shape. Maintenance methods have no effect on the type of hydration products. Microstructure analysis show that the main hydration products are C-S-H gel and C-A-S-H gel. The physical and mechanical properties of B06 product can meet the requirements of the standard GB 11968—2006 with steam curing.
Aerated concrete was prepared by alkali activated steel slag and blast furnace slag with hydrogen peroxide as air entraining agent. The influence factors on the performance of aerated concrete, including steel slag content, blast furnace slag content, molar ratio of water glass, alkali content, water-binder ratio and the alkali solution temperature were investigated. The microstructure was characterized by XRD, SEM and FTIR. Results show that to produce the aerated concrete with optimum properties, the content of steel slag is 40% with blast furnace slag of 60%, and molar ratio of water glass is 1.6, the alkali content is 6%, and water-binder ratio is 0.42, hydrogen peroxide content is 4% and 8%. The alkali solution temperature should be at 30℃. Pore size for B06 and B05 products are ranging from 0.3 to 0.6 mm and from 0.5 to 1.0 mm, and the pore are mostly closed holes with a uniform circular shape. Maintenance methods have no effect on the type of hydration products. Microstructure analysis show that the main hydration products are C-S-H gel and C-A-S-H gel. The physical and mechanical properties of B06 product can meet the requirements of the standard GB 11968—2006 with steam curing.
引文
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[2]RASHAD A M.A comprehensive overview about the influence of different additives on the properties of alkali-activated slag-A guide for civil engineer[J].Construction and Building Materials,2013,47(10):29-55.
[3]SHI C J,KRIVENKO P V,ROY D.Alkali-activated slag cements and concretes[M].Canada:Taylor and Francis,2006:71.
[4]YI Huang,XU Guoping,CHENG Huigao,et al.An overview of utilization of steel slag[J].Procedia Environmental Sciences,2012,16(4):791-801.
[5]NARAYANAN N,RAMAMURTHY K.Structure and properties of aerated concrete:A review[J].Cement&Concrete Composites,2000,22(5):321-329.
[6]KARAKURT C,KURAMA H,TOPUI·B.Utilization of natural zeolite in aerated concrete production[J].Cement&Concrete Composites,2010,32(1):1-8.
[7]YANG Lin,YAN Yun,HU Zhihua.Utilization of phosphogypsum for the preparation of non-autoclavedaeratedconcrete[J].Construction and Building Materials,2013,44(7):600-606.
[8]刘艳军,陈伯田,陈玉.加气混凝土国内外发展回顾[J].建筑节能,2013(3):30-34.LIU Yanjun,CHEN Botian,CHEN Yu.Literature review on the development and application of autoclaved aerated concrete in China and overseas[J].Building Energy Efficiency,2013(3):30-34.(in Chinese)
[9]徐清.碱矿渣加气混凝土料浆浇注稳定性试验研究[J].云南建材,1998(3):38-45.XU Qing.Experimental study on pouring stability of alkali slag aerated concrete slurry[J].Yunnan Building Materials,1998(3):38-45.(in Chinese)
[10]ALEXANDERSON J.Relations between structure and mechanical properties of autoclaved aerated concrete[J].Cement and Concrete Research,1979,9(4):570-514.
[11]张同生,刘福田,李义凯,等.激发剂对钢渣胶凝材料性能的影响[J].建筑材料学报,2008,11(4):469-474.ZHANG Tongsheng,LIU Futian,LI Yikai,et al.Influence of activators on the properties of steel slag cementitious materials[J].Journal of Building Materials,2008,11(4):469-474.(in Chinese)