雪花形抗泥聚羧酸减水剂设计及性能试验
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摘要
采用由分子结构优化设计的酯化和聚合反应方法,合成具有雪花形侧链的新型抗泥聚羧酸减水剂(PCA-SF).利用傅里叶红外光谱(FTIR)、X射线衍射(XRD)和扫描电镜(SEM)分析了蒙脱土(MMT)对PCA-SF层间吸附和表面吸附的影响;研究了PCA-SF对含MMT水泥净浆流动度及混凝土抗压强度、干缩率的影响.结果表明:MMT层间及表面均吸附了PCA-SF分子,与普通聚羧酸减水剂(PCA-1)相比,PCA-SF扩大了MMT的层间距,缩小了MMT与水泥石的界面过渡区,增加了与MMT的相容性,提高了掺MMT混凝土的强度并降低了其收缩率.
A new type of antifouling polycarboxylate water reducer(PCA-SF) with a snowflake-shaped side chain was synthesized using the molecular structure optimized design of esterification and polymerization reaction. The effect of montmorillonite(MMT) on interlayer and surface adsorption of PCA-SF was analyzed by FTIR,XRD and SEM. The effect of PCA-SF on the fluidity of cement paste, the compressive strength and shrinkage of concrete that contains montmorillonite was studied. The results show that PCA-SF molecules are adsorbed on the interlayer and surface of montmorillonite. Compared with ordinary polycarboxylate water reducer(PCA-1),PCA-SF expands the interlayer spacing of montmorillonite,narrows the interface transition area between montmorillonite and cement stone,increases the compatibility with montmorillonite, enhances the strength of concrete containing montmorillonite and reduces its shrinkage.
A new type of antifouling polycarboxylate water reducer(PCA-SF) with a snowflake-shaped side chain was synthesized using the molecular structure optimized design of esterification and polymerization reaction. The effect of montmorillonite(MMT) on interlayer and surface adsorption of PCA-SF was analyzed by FTIR,XRD and SEM. The effect of PCA-SF on the fluidity of cement paste, the compressive strength and shrinkage of concrete that contains montmorillonite was studied. The results show that PCA-SF molecules are adsorbed on the interlayer and surface of montmorillonite. Compared with ordinary polycarboxylate water reducer(PCA-1),PCA-SF expands the interlayer spacing of montmorillonite,narrows the interface transition area between montmorillonite and cement stone,increases the compatibility with montmorillonite, enhances the strength of concrete containing montmorillonite and reduces its shrinkage.
引文
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[2] PLANK J,LI H,ILG M,et al.A microstructural analysis of isoprenol ether-based polycarboxylates and the impact of structural motifs on the dispersing effectiveness[J].Cement and Concrete Research,2016,84:20-29.
[3] PLANK J,SAKAI E,MIAO C W,et al.Chemical admixtures-Chemistry,applications and their impact on concrete microstructure and durability[J].Cement and Concrete Research,2015,78:81-99.
[4] HUANG H,QIAN C,ZHAO F,et al.Improvement on microstructure of concrete by polycarboxylate superplasticizer(PCE) and its influence on durability of concrete[J].Construction and Building Materials,2016,110:293-299.
[5] JIMMA B E,RANGARAJU P R.Chemical admixtures dose optimization in pervious concrete paste selection-A statistical approach[J].Construction and Building Materials,2015,101(Part 1):1047-1058.
[6] HA T L,MUELLER M,SIEWERT K,et al.The mix design for self-compacting high performance concrete containing variousmineral admixtures[J].Materials & Design,2015,74:164.
[7] LIU X,GUAN J,LAI G,et al.Performances and working mechanism of a novel polycarboxylate superplasticizer synthesized through changing molecular topological structure[J].Journal of Colloid and Interface Science,2017,504:12-24.
[8] LEI L,PLANK J.A study on the impact of different clayminerals on the dispersing force of conventional and modified vinyl ether based polycarboxylate superplasticizers[J].Cement and Concrete Research,2014,60:1-10.
[9] TAN H,GU B,MA B,et al.Mechanism of intercalation of polycarboxylate superplasticizer into montmorillonite[J].Applied Clay Science,2016,129:40-46.
[10] LI X,ZHENG D,ZHENG T,et al.Enhancement clay tolerance of PCE by lignin-based polyoxyethylene ether in montmorillonite-contained paste[J].Journal of Industrial and Engineering Chemistry,2017,49:168-175.
[11] SHAH M V,PANDYA H J,SHUKLA A D.Influence of chemical additives on shrinkage and swelling characteristics of bentonite clay[J].Procedia Engineering,2017:189,932-937.
[12] CORINALDESI V,MORICONI G,NAIK R T.Carbon dioxide uptake by recycled-aggregate nofines concrete[C]//2nd Internoational Conference on Sustainable Construction Materials and Technologies.Ancona,Italy:[s.n.],2010:1685-1693.
[13] LIU X,GUAN J,LAI G,et al.Novel designs of polycarboxylate superplasticizers for improving resistance in clay-contaminated concrete[J].Journal of Industrial and Engineering Chemistry,2017,55:80-90.
[14] LEI L,PLANK J.A concept for a polycarboxylate superplasticizer possessing enhanced clay tolerance[J].Cement and Concrete Research,2012,42(10):1299-1306.
[15] TAN H,GU B,GUO Y,et al.Improvement in compatibility of polycarboxylate superplasticizer with poor-quality aggregate containing montmorillonite by incorporating polymeric ferric sulfate[J].Construction and Building Materials,2018,162:566-575.
[16] NG S,PLANK J.Interaction mechanisms between Na montmorillonite clay and MPEG-based polycarboxylate superplasticizers[J].Cement and Concrete Research,2012,42(6):847-854.
[17] WANG Z,HU Q,WANG Y,et al.Interlayer absorption characteristics of montmorillonite to polycarboxylate superplasticizer[J].Journal of the Chinese Ceramic Society,2013,41(8):1100-1104.