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An Investigation into the Performances of Cement Mortar Incorporating superabsorbent polymer Synthesized with Kaolin

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Fluid Dynamics & Materials Processing 2024年第6期20卷 1393-1406页

作者： Xiao Huang Jin Yang State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures and School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning530004China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China

Cement-based materials are fundamental in the construction industry,and enhancing their properties is an ongoing *** use of superabsorbent polymers(SAP)has gained significant attention as a possible way to improve the performance of cement-based materials due to their unique water-absorption and retention *** study investigates the multifaceted impact of kaolin intercalation-modified superabsorbent polymers(K-SAP)on the properties of cement *** results show that K-SAP significantly affects the cement mortar’s rheological behavior,with distinct phases of water absorption and release,leading to changes in workability over ***,K-SAP alters the hydration kinetics,delaying the exothermic peak of hydration and subsequently modifying the heat release ***,K-SAP effectively maintains a higher internal relative humidity within the mortar,reducing the autogenous shrinkage ***,K-SAP can have a beneficial effect on pore structure and this can be ascribed to the internal curing effect of released water from K-SAP.

关键词： superabsorbent polymer kaolin cement mortar rheological behavior autogenous shrinkage

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Preparation and Charcterization of Konjac superabsorbent polymer

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Journal of Wuhan University of Technology(Materials Science) 2006年第4期21卷 87-91页

作者：姜发堂 College of Food Science and Technology Huazhong Agriculture University Wuhan 430070 ChinaCollege of Biological Engineering Hubei University of Technology Wuhan 430068 China

A superabsorbent polymer was prepared by grafting sodium acrylate （ SA ） onto Konjac flour using potassium persulfate （KPS） and N, N＇-methylene bis acrylamide （ MBA ） as an initiator and crosslinker , respectively. The effect of various preparation conditions on its water absorbency was investigated. When the Konjac Flour content was 3.0g, the acrylic acid （AA） content was 30.0 g, the amount of initiator was 0. 150 g, the neutralization degree of monomer was 85% , the reaction temperature was 60 ℃ and the amount of crosslinker was 0.025 g, the polymer＇s absorbency was 750 times in pure water and 279 times in tap water at ambient temperature. It had also high water retention. The graft efficiency reached 67% . The analyses of FT-IR and SEM indicate that sodium acrylate is grafted on the polysaccharides of Konjac flour.

关键词： Konjac superabsorbent polymer preparation characterization

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Effect of superabsorbent polymer on mechanical properties of cement stabilized base and its mechanism

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Transportation Safety and Environment 2020年第1期2卷 58-68页

作者： Yongsheng Guan Zhixiang Zhang Xiaorui Zhang Junqing Zhu Wen Zhou Qi Huang Yuqing Zhang Jiangsu Sinoroad Engineering Research Institute Co.LTD 99-196 Taizhong RdNanjing 211805China School of Transportation Engineering Southeast University#2 SipailouNanjing 210096China National Engineering Laboratory of Highway Maintenance Technology Changsha University of Science&TechnologyChangsha 410114China Aston Institute of Materials Research Engineering Systems&Management GroupAston UniversityBirminghamB47ETUK

superabsorbent polymers(SAPs)are cross-linked polymers that can absorb and retain large amounts of *** recent years,a growing interest was seen in applying SAPs in concrete to improve its performance due to its efficiency in mitigating *** paper presents findings in a study on effect of SAPs on performance of cement-treated base(CTB),using the experience of internal curing of *** specimens with and without SAPs were prepared and tested in the *** conducted include mechanical property testing,dry shrinkage testing,differential thermal analysis,mercury intrusion porosimetry and scanning electron microscope *** was found that 7-day and 28-day unconfined compressive strength of CTB specimens with SAPs was higher than regular CTB specimens.28d compressive strength of CTB specimens with SAPs made by Static pressure method was 5.87 MPa,which is 27%higher than that of regular CTB *** shrinkage of CTB specimens with SAPs was decreased by 52.5%comparing with regular CTB *** the microstructure analysis it was found that CTB specimens with SAPs could produce more hydration products,which is also the reason for the strength improvement.

关键词： superabsorbent polymer cement-stabilized base internal curing mechanical property drying shrinkage

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Experimental Synthesis of Polyacrylic-Type superabsorbent polymer and Analysis of Its Internal Curing Performances

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Fluid Dynamics & Materials Processing 2022年第1期18卷 15-27页

作者： Jin Yang Wen Liang Xingyang He Ying Su Fulong Wang Tie Wang Jianxiang Huang School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China Building Waterproof Engineering and Technology Research Center of Hubei Province Hubei University of TechnologyWuhan430068China

A solution polymerization method has been used to synthesize a polyacrylic-type superabsorbent polymer(SAP).The influence of various influential factors,such as the temperature,neutralization degree,cross-linking agent,and initiator,on the water absorption capacity of SAP has been *** results show that the absorption can display a non-monotonic behavior depending on the synthesis *** absorption can also change according to the pH,ion types and ion *** the pH value increases,the water absorption capacity decreases *** also decreases if the N^(a+)concentration becomes higher and becomes particularly low in solutions containing Mg^(2+).With the addition of SAP,the compressive strength of cement mortar decreases;the internal relative humidity can be maintained at 96%within 200 hours;and autogenous shrinkage can be reduced by nearly 69%.

关键词： superabsorbent polymer synthesis internal relative humidity internal curing

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Synthesis and Characterization of Polyvinylpyrrolidone modified Bentonite and Its Application in superabsorbent polymer

Synthesis and Characterization of Polyvinylpyrrolidone modif...

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2014中国功能材料科技与产业高层论坛

作者： Peiqi Wu Chengzhang Zheng Junjian Liao Bing Lin Min Chen Jianjun Du Qiming Lu Institute of Biomaterials College of SciencesSouth China Agricultural University Electric Power Research Institute of Guangdong Power Grid Corporation College of Environmental science and Engineering Zhongkai University of Agriculture and Engineering

The modified bentonite was prepared via solution intercalation using sodium bentonite and a series of polyvinylpyrrolidone（PVP）as raw material and intercalation agents,*** effects of the amount and molecular weight of PVPon bentonite modification were *** the structure of M-Bent was characterized by Fourier transform infrared（FTIR）,X-Ray Diffraction（XRD）,Thermogravimetric Analyzer（TG）and Brunauer-EmmettTeller surface area measurement（BET）.The waterswelling capability of superabsorbent composite based on M-Bent was determined as *** indicated that the basal spacing for M-Bent increased to 2.196nm and expansion volumn increased to 84 mL,when PVP content was 8%andaverage relative molecular weight was *** water and 0.9%NaCl solution absorbency of superabsorbent composite containing M-Bent can reach 681.2 g/g and 125.4 g/*** composites in practice were also studied by observing anddetecting the harm to the root when the summer maize seeds grew in the water absorbed *** root of summer maize were sturdier compared to the plants grown without the M-Bent in superabsorbent.

关键词： bentonite superabsorbent polymer water absorbency polyvinylpyrrolidone

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Hydration, microstructure and autogenous shrinkage behaviors of cement mortars by addition of superabsorbent polymers

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Frontiers of Structural and Civil Engineering 2020年第5期14卷 1274-1284页

作者： Beibei SUN Hao WU Weimin SONG Zhe LI Jia YU School of Civil Engineering Central South UniversityChangsha 410075China Magnel Laboratory for Concrete Research Department of Structural EngineeringGhent UniversityGhent 9052Belgium National Engineering Laboratory for High Speed Railway Construction Central South UniversityChangsha 410075China

superabsorbent polymer(SAP)has emerged as a topic of considerable interest in recent *** present study systematically and quantitively investigated the effect of SAP on hydration,autogenous shrinkage,mechanical properties,and microstructure of cement *** of SAP on hydration heat and autogenous shrinkage were studied by utilizing TAM AIR technology and a non-contact autogenous shrinkage test *** Electron Microscope(SEM)was employed to assess the microstructure *** SAP decreased the peak rate of hydration heat and retarded the hydration,it significantly increased the cumulative heat,indicating SAP helps promote the *** promotion caused by SAP mainly occurred in the deceleration period and attenuation *** can significantly mitigate the autogenous shrinkage when the content ranged from 0 to 0.5%.Microstructure characteristics showed that pores and gaps were introduced when SAP was *** microstructure difference caused by SAP contributed to the inferior mechanical behaviors of cement mortars treated by SAP.

关键词： superabsorbent polymer mechanical properties hydration heat autogenous shrinkage microstructure

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Preparation of straw superabsorbent composite material by microwave method

Preparation of straw superabsorbent composite material by mi...

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第八届中国功能材料及其应用学术会议

作者： YANG Lian-wei WANG Rui-jie School of Resources and Materials Northeastern University at Qinhuangdao Branch

ISBN: (纸本)9783037859698

By microwave method,a superabsorbent function composite material was prepared by grafting sodium acrylate onto straw flour using potassium persalfate(KSO) and N,N’-methylene bis acrylamide as an initiator and crosslinker,*** effect of various preparation conditions on its water absorbency was *** the straw flour content was 6%,the acrylic acid content was 20.0g,the amount of initiator was 0.4%,the neutralization degree of monomer was 80%,the reaction temperature was 70℃ and the amount of crosslinker was 0.05%,the material’s absorbency was 1360 times in distilled water and 152 times in 0.9%salt-water at ambient *** had also high water *** analyses of SEM indicate that sodium acrylate is grafted on the polysaccharides of straw flour.

关键词： Straw superabsorbent polymer preparation characterization

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Super-absorbent swellable polymer as grouting material for treatment of karst water inrush

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International Journal of Mining Science and Technology 2021年第5期31卷 753-763页

作者： Shucai Li Chenyang Ma Rentai Liu Mengjun Chen Jia Yan Zhenjun Wang Shaolong Duan Huasheng Zhang School of Civil Engineering Shandong UniversityJinan 250061China Geotechnical and Structural Engineering Research Centre Shandong UniversityJinan 250061China School of Qilu Transportation Shandong UniversityJinan 250002 China

Grouting is the most commonly used method to control water inrush in underground *** cement-based materials are easy to dilute and hard to coagulate under the influence of large flow and high-velocity water *** address these deficiencies,a new type of polymer grouting material with an excellent expansion ratio was *** material quickly absorbs water and has an expansion ratio of 1:*** material is composed of a superabsorbent polymer(SAP),glycerol,and *** effects of water quality on the expansion ratio and expansion rate of the material were examined,and the best solid–liquid ratio for the slurry was determined by fluidity measurements.A karst specially designed pipeline water inrush test device showed that 800 g of SAP can achieve 0.6 m/s water flow blockage in the smooth pipeline,demonstrating that the ability of the SAP slurry to block water inrush is superior to those of other *** study provides a reference for water inrush plugging,and has important implications for the reduction and control of karst pipeline-type water inrush disasters,ensuring the safety of construction sites and preventing loss of life and damage to property.

关键词： Karst Water inrush Model test Grouting material superabsorbent polymer

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