赤泥对碱激发轻质泡沫混凝土性能的影响研究
Study on the effect of red mud on properties of alkali activated lightweight foam concrete
关键词：
轻质泡沫混凝土；赤泥掺量；宏观性能；微观机理
Key words：
Lightweight foam concrete; Content of red mud; Macroscopic property; Microscopic mechanism
刊期：
2023年第10期
DOI：
10.19761/j.1000-4637.2023.10.066.06
文章编号：
基金项目：
作者：
胡忠帅，董建统，刘志勇*
单位：
烟台大学 土木工程学院，山东 烟台264005
摘要
摘 要：为探究赤泥部分取代矿渣对碱激发泡沫混凝土性能及其微观机理的影响，以赤泥-硅酸盐水泥-矿渣三元复合胶凝材料为泡沫混凝土基体，采用氢氧化钠和硅酸钠溶液作为激发剂，通过纳米改性发泡剂进行物理发泡，制备了不同赤泥取代率的轻质泡沫混凝土（密度等级为A04），并采用激光位移传感器、电子显微镜、X射线衍射仪及热重分析仪进行了检测和表征。结果表明：赤泥的掺入不利于泡沫混凝土的前期稳定性，当赤泥取代率为20%~40%时，泡沫混凝土前90 min的最终沉降量增量较小；赤泥的掺入会降低泡沫混凝土流动度和抗压强度；当赤泥掺量为30%时，泡沫混凝土的抗压强度下降速率最低。
Abstract: In order to study the replacement of mineral powder with red mud on the macroscopic properties and microscopic mechanism of alkali activited foam concrete, the lightweight foam concrete(its density class is A04) with different contents of red mud was prepared by using red mud-Portland cement-slag terpolymer as the foam concrete matrix, the sodium hydroxide and sodium silicate solutions were used as activators, the nano-modified foaming agent was used as physical foaming. The laser displacement sensor, electron microscope, X-ray diffractometer and thermogravimetric analyzer were used to detect and characterize. The results show that the replacement of mineral powder with red mud is not conducive to the early stability of foam concrete, but when the content of red mud increases from 20% to 40%, the increment of final settlement in the first 90 min of foam concrete is small. The replacement of mineral powder with red mud will reduce the fluidity and compressive strength of foam concrete. When the content of red mud is 30%, the compressive strength of foam concrete will decrease at the lowest rate.
结论
（1）赤泥的掺入对泡沫混凝土的前期稳定性有不利影响。
（2）赤泥的掺入会导致泡沫混凝土流动性、抗压强度降低，当赤泥掺量为30%时，泡沫混凝土抗压强度下降速率最低，当掺量为30%及以上时，泡沫混凝土的28 d抗压强度出现了倒缩现象。
（3）泡沫混凝土抗压强度大小与气泡孔隙结构关系较小，与水化产物的成分关系较大。随着赤泥掺量的增大，硅酸钙化合物的缺陷增多，导致泡沫混凝土抗压强度降低。
参考文献
[1] 李文晓.能源现状及某些重要战略对策解析[J].化学管理,2021(4):13-14.
[2] 赵越.赤泥基采空区填充材料及其环保性能的试验研究[D].太原:太原理工大学，2021.
[3] 赵德霞.碱激发粉煤灰/矿渣泡沫混凝土的制备与性能研究[D].广州:广州大学,2018.
[4] 赵国智.泡沫混凝土的性能及优点[J].福建建材,2011(3):21,48.
[5] 侯志辉.赤泥地聚合物轻质混凝土制备技术及性能研究[D].徐州:中国矿业大学,2018.
[6] 代建青.拜尔法赤泥制备泡沫混凝土砌块[D].青岛:山东理工大学,2012.
[7] PHPP T,MAEGAWA A,MISHIMA N,et al.Effects of sodium hydroxide and sodium silicate solutions on compressive and shear bond strengths of FA-GBFS geopolymer[J].Construction and Building Materials,2015,91:1-8.
[8] BADANOIU A,Al S,STOLERIU S,et al.Preparation and characterization of foamed geopolymers from waste glass and red mud[J].Construction and Building Materials,2015,84:284-293.
[9] DE V A,DE G R,CASTRO G.Study of geopolymeric binders of fly ash/metakaolin mixtures cured at room temperature[J]. Key Engineering Materials,2014,60:338-344.
[10] XIONG Y,ZHANG C,CHEN C,et al.Effect of superabsorbent polymer on the foam-stability of foamed concrete[J].Cement and Concrete Composites,2022,127:104398.
[11] DHASINDRAKRISHNA K,PASUPATH K,RAMAKRISH S,et al.Effect of yield stress development on the foam-stability of aerated geopolymer concrete[J].Cement and Concrete Research,2020,138:899-912.
[12] ROUSSEL N,STEFANI C,LEROY R.From mini-cone test to Abrams cone test: measurement of cement-based materials yield stress using slump tests[J].Cement and Concrete Research,2005,35(5):256-265.
[13] 党钧陶,汤小松,肖建庄,等.碱激发泡沫混凝土早期稳定行为及机理研究[J].建筑材料学报,2023,26(7):1-13.
[14] 汤州龙.不同碱激发剂对矿渣水泥性能的影响[J].福建交通科技,2021(7):51-53.
[15] 玄家奇,刘浩,李纪昕,等.碱激发矿粉制备泡沫混凝土及其性能的影响机制研究[J].新型建筑材料,2023,50(6):83-89.
[16] 熊远亮.高抗裂泡沫混凝土的制备及其收缩开裂性能研究[D].南京:东南大学,2022.
[17] 牛云辉,蒋俊,张玉苹,等.自流平泡沫混凝土流动性能影响研究[J].混凝土与水泥制品,2016(11):65-68.
[18] 司常钧.拜耳法赤泥固化基础研究[D].昆明:昆明理工大学,2013.
[19] YUAN L X,ZHONG SH,ZI J J,et al.Effect of formic acid as an accelerator on foam-stability, compressive strength, and pore size distribution of foam concrete[J].Journal of Building Engineering,2023,66:52-58.
[20] GU G,XU F,HUANG X,et al.Foamed geopolymer:the relationship between rheological properties of geopolymer paste and pore-formation mechanism[J].Journal of Cleaner Production,2020,277:108-112.
[21] JIANG J,LU Z Y,NIU Y H,et al.Study on the preparation and properties of high-porosity foamed concretes based on ordinary Portland cemen[J].Material Design,2016;92:949-959.
[22] SUN C,ZHU Y,GUO J,et al.Effects of foaming agent type on the workability, drying shrinkage, frost resistance and pore distribution of foamed concrete[J].Construction and Building Materials,2018,186:208-216.
[23] LI L X,ZU H Z,HONG F L,et al.Drying shrinkage behavior of hybrid alkali activated cement(HAAC) mortars[J].Construction and Building Materials,2022,316:859-863.
[24] 王克勤,李爱秀,邓海霞,等.山西氧化铝赤泥的物化性质[J].轻金属,2012(4):25-28.
[25] 何凝.赤泥矿渣基地聚合物透水混凝土性能研究[D].广州:华南理工大学,2022.
[26] 胡勇.拜耳法赤泥地聚物合成及铁对地聚物影响的研究[D].广州:华中科技大学,2017.
[27] 罗忠涛,康少杰,张美香,等.碱激发赤泥-矿渣地质聚合物制备及力学性能研究[J].武汉理工大学学报,2019,41(3):47-51.
[28] BIN B H,BAO L L,CHUN C,et al.Surface etching and early age hydration mechanisms of steel slag powder with formic acid[J].Construction and Building Materials,2021,280:765-770.
[29] CRIVENERS K,SNELLINGS R,LOTHENBACH B A. Practical Guide to Microstructural Analysis of Cementitious Materials[M].Paris:CRC Press,2018.
引用本文
胡忠帅,董建统,刘志勇.赤泥对碱激发轻质泡沫混凝土性能的影响研究[J].混凝土与水泥制品,2023(10):66-71.
HU Z S,DONG J T,LIU Z Y.Study on the effect of red mud on properties of alkali activated lightweight foam concrete[J].China Concrete and Cement Products,2023(10):66-71.
上一个： 高强钢筋页岩陶粒混凝土柱偏心受压性能 研究及损伤分析
相关文件