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An Investigation into the Performances of Cement Mortar Incorporating Superabsorbent Polymer Synthesized with Kaolin
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作者 Xiao Huang Jin Yang 《Fluid Dynamics & Materials Processing》 EI 2024年第6期1393-1406,共14页
Cement-based materials are fundamental in the construction industry,and enhancing their properties is an ongoing challenge.The use of superabsorbent polymers(SAP)has gained significant attention as a possible way to i... Cement-based materials are fundamental in the construction industry,and enhancing their properties is an ongoing challenge.The 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 properties.This study investigates the multifaceted impact of kaolin intercalation-modified superabsorbent polymers(K-SAP)on the properties of cement mortar.The 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 time.Furthermore,K-SAP alters the hydration kinetics,delaying the exothermic peak of hydration and subsequently modifying the heat release kinetics.Notably,K-SAP effectively maintains a higher internal relative humidity within the mortar,reducing the autogenous shrinkage behavior.Moreover,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. 展开更多
关键词 superabsorbent polymer KAOLIN cement mortar rheological behavior autogenous shrinkage
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纳米二氧化硅负载丙烯酰胺型SAP内养护性能研究
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作者 吕阳 范福龙 +3 位作者 吴远帅 朱艳超 张呈山 李相国 《硅酸盐通报》 CAS 北大核心 2024年第7期2393-2403,共11页
设计制备了纳米二氧化硅(NS)负载丙烯酰胺型高吸水树脂(SAP),探究了不同NS负载量的SAP对砂浆自收缩、干燥收缩和力学性能的影响。结果表明,丙烯酰胺型SAP能够完全消除砂浆自收缩,而随着NS负载量增加,负载型SAP对自收缩的抑制作用降低,... 设计制备了纳米二氧化硅(NS)负载丙烯酰胺型高吸水树脂(SAP),探究了不同NS负载量的SAP对砂浆自收缩、干燥收缩和力学性能的影响。结果表明,丙烯酰胺型SAP能够完全消除砂浆自收缩,而随着NS负载量增加,负载型SAP对自收缩的抑制作用降低,但仍保持在80%以上。SAP及额外水的引入增加了砂浆的干燥收缩,但随着NS负载量增加,负载型SAP对缓解干燥收缩有积极作用。SAP及额外水的引入降低了砂浆的力学性能,但随着NS负载量增加,负载型SAP显著改善了砂浆的力学性能。其中,负载50%(相对于丙烯酰胺的质量分数)NS的SAP对砂浆力学性能影响最小,试样在28 d龄期的抗压强度与抗折强度仅损失5.6%与2.2%。热重(TG)以及背散射扫描电子显微镜(BSE)结果表明,随着NS负载量增加,负载型SAP内养护试样的水化程度显著提高,微观结构明显改善。 展开更多
关键词 纳米二氧化硅 高吸水树脂 砂浆 自收缩 干燥收缩 力学性能 水化程度 微观结构
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Effects of superabsorbent polymer particles on flexural properties and self-healing behavior of ECC 被引量:5
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作者 Deng Hanwen 《Journal of Southeast University(English Edition)》 EI CAS 2018年第1期95-103,共9页
In order to improve the self-healing behavior and the recovery of mechanical properties of engineered cementitious composites(ECC),the approach of incorporating superabsorbent polymer(SAP)in mixtures is investigated.T... In order to improve the self-healing behavior and the recovery of mechanical properties of engineered cementitious composites(ECC),the approach of incorporating superabsorbent polymer(SAP)in mixtures is investigated.The rapid water penetration test and four-point bending test were conducted to evaluate the effects of self-healing on the water permeability and mechanical properties of pre-damaged ECC.The self-healing process and self-healing products were observed by the environment scanning electron microscope(ESEM)and energy dispersive X-ray spectroscopy(EDS).The experimental results show that all ECC mixtures exhibit excellent flexural capacity,meanwhile maintaining a crack width below 50μm.The incorporation of SAP particles in ECC can apparently improve the mechanical recovery of ECC mixtures after 10 healing curing cycles,such as flexural deformation and flexural stiffness.The flexural stiffness of ECC containing 4%SAP particles after self-healing can be recovered to 80%.The self-healing test results show that when the water permeability of ECC mixtures incorporating SAP particles is close to zero,only three healing cycles are needed.When ECC incorpora ting more SAP particles,the accelerated self-healing process can be finished in the first three cycles,and self-healing product is mixed Ca(OH)2/CaCO 3 with CaCO 3 being a major component in the later stage.It is,therefore,feasible to produce ECC materials incorporating SAP particles,while simultaneously maintaining higher material ductility and self-healing behavior. 展开更多
关键词 engineered cementitious composites(ECC) SELF-HEALING superabsorbent polymer(sap) mechanical property
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Mechanical property of strain-hardening cementitious composites modified with superabsorbent polymers 被引量:2
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作者 Deng Hanwen 《Journal of Southeast University(English Edition)》 EI CAS 2017年第3期309-315,共7页
In order to improve the tensile property, flexuralproperty and drying shrinkage of strain-hardening cementitiouscomposites (SHCC), mixtures quantitatively modified withsuperabsorbent polymer (SAP) were investigate... In order to improve the tensile property, flexuralproperty and drying shrinkage of strain-hardening cementitiouscomposites (SHCC), mixtures quantitatively modified withsuperabsorbent polymer (SAP) were investigated. Theuniaxial tensile test, the four-point bending test, thecompressive test, the drying shrinkage test and theenvironmental scanning electron microscope (ESEM) wereemployed to investigate the tensile strain capacity, flexuraldeformation capacity, compressive strength, drying shrinkage,crack width and self-healing of SHCC. The experimentalresults show that SHCC modified with SAP particles exhibitsexcellent ductility and deformability, and the tensile strain isup to about 4.5% and the average crack width is controlledaround 40 μm. Meanwhile, the drying shrinkage of SHCCmodified with SAP particles can reduce by about 60%.Furthermore, the self-healing behavior is observed in thecracks of specimen after three cycles of high-low relativehumidity curing, and the self-healing products can completelyfill the cracks of SHCC specimens modified with SAPparticles. It is, therefore, feasible to produce SHCC materialmodified with SAP particles, while simultaneously retaininghigher material ductility. 展开更多
关键词 STRAIN-HARDENING cementitious composites (SHCC) superabsorbent polymer (sap) mechanical property SELF-HEALING
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Superabsorbent polymer for water management in forestry 被引量:2
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作者 Miguel Casquilho Abel Rodrigues Fátima Rosa 《Agricultural Sciences》 2013年第5期57-60,共4页
The effectiveness of a superabsorbent polymer of sodium polyacrylate was studied, with emphasis on water management, i.e., absorption, retention and desorption in the soil. The polymer was applied in plots with a sand... The effectiveness of a superabsorbent polymer of sodium polyacrylate was studied, with emphasis on water management, i.e., absorption, retention and desorption in the soil. The polymer was applied in plots with a sandy soil near Grandola (southern Portugal). Characterization of the most relevant physical and chemical properties of the polymer was made, namely, its specific gravity, particle diameter, capacity of water absorption and desorption. In the plots with and without the polymer, soil moisture was continuously monitored, and grassland biomass samples were collected and weighed. The results reflected the effective role of the polymer both in the improvement of the water regime in the soil and in the substantial increment of grassland productivity. 展开更多
关键词 ABSORPTION DESORPTION SODIUM POLYACRYLATE superabsorbent polymer sap
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Preparation and Charcterization of Konjac Superabsorbent Polymer 被引量:1
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作者 姜发堂 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第4期87-91,共5页
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 , respectiv... 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. 展开更多
关键词 KONJAC superabsorbent polymer PREPARATION CHARACTERIZATION
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Factors Influencing Strength of Super Absorbent Polymer(SAP)Concrete 被引量:5
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作者 Hongyan Ding Lei Zhang Puyang Zhang 《Transactions of Tianjin University》 EI CAS 2017年第3期245-257,共13页
Super absorbent polymers (SAPs) are gradually being applied in concrete production as internal curing agents. SAP can effectively reduce early age autogenous shrinkage of concrete, alleviate the hazards caused by conc... Super absorbent polymers (SAPs) are gradually being applied in concrete production as internal curing agents. SAP can effectively reduce early age autogenous shrinkage of concrete, alleviate the hazards caused by concrete cracking and improve its freeze–thaw resistance. However, the relationships between SAP dosage, SAP particle size and the water–cement ratio of concrete have certain influences on the evolution of the compressive strength of SAP-incorporated concrete. In this study, experiments were conducted to investigate the relationships between the water–cement ratio of concrete, the SAP dosage and SAP particle size. The significant factors influencing concrete strength are determined and equations are proposed for predicting the strength of SAP-incorporated concrete at 3, 7 and 28 days. The findings from this study, such as the SAP dosage should not be larger than 0.2%, are expected to form a theoretical basis for the rational use of SAP as an additive to concrete. © 2017, Tianjin University and Springer-Verlag Berlin Heidelberg. 展开更多
关键词 ABSORPTION CEMENTS Compressive strength Foamed plastics Particle size polymerS Statistical methods
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A Novel Method for Studying the Re-Swelling Capacity of Superabsorbent Polymers in An Artificial Crack
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作者 LIU Juanhong YANG Haitao +2 位作者 XUE Yanpeng LAI Zhaogui JI Hongguang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2020年第5期996-1002,共7页
Re-swelling capacity is a key factor influencing the self-sealing efficiency of superabsorbent polymers (SAPs) in concrete.In this paper,a new parameter (re-swelling ratio,η),the volume ratio of the crack which was f... Re-swelling capacity is a key factor influencing the self-sealing efficiency of superabsorbent polymers (SAPs) in concrete.In this paper,a new parameter (re-swelling ratio,η),the volume ratio of the crack which was filled with the expansive SAPs and the dry SAPs,was given to quantify the re-swelling capacity of a single SAPs particle.An innovative immersion test was used to study the η value of SAPs in the hardened cement paste with an artificial crack.Moreover,the influence of the crack width and particle size on the sealing efficiency of SAPs in the cracked paste was investigated by a water permeability test.The results showed that the mass ratios of the expansive SAPs in an artificial crack were less than those in a free state.The η value of SAPs in the hardened paste with an artificial crack increased with the increase of the crack width due to the restricting effects of the crack.The expansive SAPs in the cracked paste could totally seal or partly seal the crack within the original void.Moreover,the sealing efficiency of SAPs slightly increased with the rise of the crack width (0.25 to 0.5 mm) and the reduction of the particle size.This research demonstrates that the crack width in concrete and the particle size of SAPs are the key factors influencing the re-swelling behavior of SAPs which should be taken into consideration when designing the self-sealing concrete containing SAPs. 展开更多
关键词 superabsorbent polymers re-swelling CRACK self-sealing concrete
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Influence of CaO-based expansive agent,superabsorbent polymers and curing temperature on pore structure evolution of early-age cement paste
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作者 ZHAO Hai-tao LI Xiao-long +5 位作者 XIE Dong-sheng DI Yun-fei HUANG Jie XU Wen WANG Peng-gang ZUO Jun-qing 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第5期1663-1673,共11页
Cracks easily generate in concrete at early age owing to the shrinkage deformation.CaO-based expansion agent(CEA)and superabsorbent polymers(SAP)have been extensively used for the mitigation of concrete shrinkage.The ... Cracks easily generate in concrete at early age owing to the shrinkage deformation.CaO-based expansion agent(CEA)and superabsorbent polymers(SAP)have been extensively used for the mitigation of concrete shrinkage.The macroscopic properties of concrete are highly determined by the microstructure.In this study,the influence of CEA and SAP addition on the pore structure evolution of cement paste under different curing temperatures was evaluated via low-field nuclear magnetic resonance spectroscopy.Test results indicated that,in cement paste,a higher CEA content led to a higher porosity and a larger most probable pore diameter(MPPD).Meanwhile,SAP addition increased the porosity and MPPD of CEA cement paste at early age but decreased them after 7 d,and a higher SAP content always brought a higher porosity and MPPD.Furthermore,the addition of SAP led to a lower porosity and MPPD of CEA cement paste than that of plain cement paste after 14 d.Moreover,the porosity and MPPD of CEA cement paste decreased first and subsequently increased as the curing temperature raised. 展开更多
关键词 cement paste pore structure CaO-based expansion agent superabsorbent polymers curing temperature low-field nuclear magnetic
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Experimental Synthesis of Polyacrylic-Type Superabsorbent Polymer and Analysis of Its Internal Curing Performances
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作者 Jin Yang Wen Liang +4 位作者 Xingyang He Ying Su Fulong Wang Tie Wang Jianxiang Huang 《Fluid Dynamics & Materials Processing》 EI 2022年第1期15-27,共13页
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 agen... 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 investigated.The results show that the absorption can display a non-monotonic behavior depending on the synthesis conditions.The absorption can also change according to the pH,ion types and ion concentration.As the pH value increases,the water absorption capacity decreases significantly.It 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%. 展开更多
关键词 superabsorbent polymer SYNTHESIS internal relative humidity internal curing
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Study on the Expansion of a Cement-Based System Containing Sap Polymer and Supplementary Cementing Materials
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作者 Tatiana L. ávalos-Rendón Carlos Javier Mendoza 《Materials Sciences and Applications》 2017年第2期123-134,共12页
In this paper, the addition of admixed superabsorbent polymer (SAP) improved the microstructure and durability-related properties in a cement-based system with supplementary materials. This is an important issue in re... In this paper, the addition of admixed superabsorbent polymer (SAP) improved the microstructure and durability-related properties in a cement-based system with supplementary materials. This is an important issue in real construction projects when good durability properties are required. This study investigates the effect of SAP on the systems using cement replacement by fly ash and silica fume considering the strength properties and durability properties of paste under sulfate attack of cement-based system. The replacement considered in the study was of 10% silica fume and 20% fly ash in each case, the dosage of SAP was 0.25% of the total amount of cementitious material. The results showed that the addition of SAP in the cement-based system improved the compressive strength and reduced expansion to sulfate attack. Scanning electron micrographs showed that utilization of fly ash with silica fume and silica fume with SAP resulted in a much denser microstructure, thereby, leading to an increase in compressive strength and lower expansion under sulfate attack. 展开更多
关键词 sap polymer SUPPLEMENTARY Materials SULFATE ATTACK Durability
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Assessment of Super Absorbent Polymer (SAP) on Plant Available Water (PAW) in Dry Lands
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作者 Vincent Ng’eno Christian Omuto +1 位作者 Duncan Mbuge Vitalis Too 《Engineering(科研)》 CAS 2023年第2期90-105,共16页
One of the ways of overcoming the cost of irrigation is through in-situ water harvesting at the plant roots. Super absorbent polymer (SAP) can facilitate water harvesting at the plant roots. This study attempted to as... One of the ways of overcoming the cost of irrigation is through in-situ water harvesting at the plant roots. Super absorbent polymer (SAP) can facilitate water harvesting at the plant roots. This study attempted to assess the effect of SAP on plant available water (PAW) of different soils. In this study, SAP was sequentially added at the rate of 0.2%, 0.3% and 0.5% of the soil weight and its impact assessed in clay, sandy clay and sandy loam soils. The moisture retention characteristics of the original and SAP treated soils were studied using soil water retention curves (SWRC) and results modelled using Gardner model. PAW was estimated from SWRC as the difference between moisture content at 1.5 and 3 bar in all soils. The difference in PAW between original and treated soils was assessed at 5% level of significance. The WRC of all the samples was adequately found to be described by the Gardner model (Coefficient of determination R<sup>2</sup> ≥ 98% and residual standard error (RSE) ≤ 0.04). SWRC changed with increase in SAP percentage in clay, sandy clay and sandy loam soils. Clay had a higher change in water retention then sandy clay and lastly sandy loam. Plant available water content (PAW) in all soils increased. In clay soil it increased with increase in SAP from 0.3291 at zero SAP to 0.6223 at 0.5% SAP. Sandy clay soil increased in PAW from 0.2721 at zero SAP to 0.5335 at 0.5% SAP and Sandy loam soils from 0.1691 at zero SAP to 0.3461 at 0.5% SAP. Hence, from the study SAP can be used to conserve irrigation water in the plant roots and therefore reducing the cost since PAW has been increased. 展开更多
关键词 Plant Available Water (PAW) Soil Water Retention Curve (SWRC) SOIL Super Absorbent polymer (sap)
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SAP和聚丙烯纤维双掺对混凝土抗压强度及抗渗性能的影响
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作者 哈吉章 张学兵 +3 位作者 全阳 罗光财 梅国栋 闫实 《施工技术(中英文)》 CAS 2024年第11期40-45,共6页
隧道等地下工程混凝土主体结构渗漏为常见质量问题,严重影响结构的安全、正常使用功能及耐久性,因此混凝土的抗渗性能成为研究焦点。采用双掺SAP和聚丙烯纤维提高混凝土的抗渗性能,在混凝土中分别掺入质量比为胶凝材料0.1%,0.3%,0.5%的S... 隧道等地下工程混凝土主体结构渗漏为常见质量问题,严重影响结构的安全、正常使用功能及耐久性,因此混凝土的抗渗性能成为研究焦点。采用双掺SAP和聚丙烯纤维提高混凝土的抗渗性能,在混凝土中分别掺入质量比为胶凝材料0.1%,0.3%,0.5%的SAP,并同时分别加入1,2,3kg/m3的聚丙烯纤维,进行抗压与抗渗试验。结果表明:单掺0.1%~0.3%SAP时几乎不影响混凝土的抗压强度,但掺量为0.5%时,抗压强度会显著降低;双掺0.1%SAP和0~2kg/m3聚丙烯纤维可略微提升混凝土抗压强度,并且显著改善其抗渗性能;经对比,掺入0.1%~0.3%SAP和0~2kg/m3聚丙烯纤维时,可保证混凝土的抗压强度,提高抗渗性能,有效降低混凝土的渗水风险。 展开更多
关键词 混凝土 超吸水性树脂 聚丙烯纤维 抗压强度 抗渗性能
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含SAP水泥基材料动态力学性能演变规律研究
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作者 李剑峰 《硅酸盐通报》 CAS 北大核心 2024年第6期2022-2030,共9页
关于高应变速率下含高吸水树脂(SAP)水泥基材料力学行为的研究较少,本文通过压汞法和图像法研究了含SAP水泥基材料的总孔隙率和宏观孔(>100μm)孔隙率;分析了SAP粒径和补偿水对改性材料准静态(10~(-5)s^(-1))和动态(60~110 s^(-1))... 关于高应变速率下含高吸水树脂(SAP)水泥基材料力学行为的研究较少,本文通过压汞法和图像法研究了含SAP水泥基材料的总孔隙率和宏观孔(>100μm)孔隙率;分析了SAP粒径和补偿水对改性材料准静态(10~(-5)s^(-1))和动态(60~110 s^(-1))力学性能的影响;基于裂缝扩展行为的研究,解析了高应变速率下水泥基材料的破坏行为。结果表明:添加补偿水和增大SAP粒径均会提升材料的宏观孔孔隙率和总孔隙率,从而降低准静态和动态压缩作用下试样的抗压强度和弹性模量;添加补偿水和增大SAP粒径还会提高水泥基材料的抗压强度动态增加因子和弹性模量动态增加因子,这是由于总孔隙率和宏观孔孔隙率的增加会引起裂缝扩展路径的改变、破碎程度的增加以及应变响应的延迟。 展开更多
关键词 水泥基材料 高吸水树脂(sap) 孔结构 动态力学试验 断裂行为 动态增加因子(DIF)
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SAP预湿水量对UHPC性能的影响
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作者 李信 陈露一 《混凝土与水泥制品》 2024年第4期53-55,共3页
研究了高吸水性树脂(SAP)的预湿水量(0、20、30、40 kg/m3)对超高性能混凝土(UHPC)工作性、力学性能和收缩性能的影响。结果表明:随着SAP预湿水量的增加,UHPC的初始和3 h扩展度均增加,3 d和28 d抗压强度均降低,且3 d抗压强度降低更明显... 研究了高吸水性树脂(SAP)的预湿水量(0、20、30、40 kg/m3)对超高性能混凝土(UHPC)工作性、力学性能和收缩性能的影响。结果表明:随着SAP预湿水量的增加,UHPC的初始和3 h扩展度均增加,3 d和28 d抗压强度均降低,且3 d抗压强度降低更明显,自收缩值降低,干燥收缩值增大。 展开更多
关键词 高吸水性树脂 超高性能混凝土 工作性 力学性能 收缩性能
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SAP对含粗骨料超高性能混凝土收缩和力学性能的影响
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作者 许洋 郑晓博 韩方玉 《江苏建材》 2024年第1期15-18,共4页
含粗骨料超高性能混凝土(粗骨料UHPC)可兼顾超高强度和超高耐久性能,进一步降低收缩,但自收缩较大的问题仍未解决。文章主要研究了高吸水性树脂(SAP)在0.1%、0.15%和0.2%胶凝材料用量下,相对于膨胀剂对粗骨料UHPC工作性、自收缩以及力... 含粗骨料超高性能混凝土(粗骨料UHPC)可兼顾超高强度和超高耐久性能,进一步降低收缩,但自收缩较大的问题仍未解决。文章主要研究了高吸水性树脂(SAP)在0.1%、0.15%和0.2%胶凝材料用量下,相对于膨胀剂对粗骨料UHPC工作性、自收缩以及力学性能的影响。 展开更多
关键词 高吸水性树脂 粗骨料超高性能混凝土 自收缩 弯曲性能 拉伸性能
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SAP内养护剂改善膨胀混凝土性能及其机理研究 被引量:55
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作者 秦鸿根 高美蓉 +1 位作者 庞超明 孙伟 《建筑材料学报》 EI CAS CSCD 北大核心 2011年第3期394-399,共6页
研究了SAP(超强吸水树脂)内养护剂对膨胀混凝土力学性能、变形开裂性能和耐久性能的影响,然后通过MIP,SEM,XRD等手段对其养护机理进行了微观分析.结果表明:掺加SAP可显著提高膨胀混凝土的早期膨胀值和限制膨胀率,降低膨胀与收缩变形的差... 研究了SAP(超强吸水树脂)内养护剂对膨胀混凝土力学性能、变形开裂性能和耐久性能的影响,然后通过MIP,SEM,XRD等手段对其养护机理进行了微观分析.结果表明:掺加SAP可显著提高膨胀混凝土的早期膨胀值和限制膨胀率,降低膨胀与收缩变形的差值,且对强度、渗透性无不利影响.由于SAP具有吸水-释水功能,因此掺加SAP将有利于钙矾石的生成和水泥水化程度的提高,并能有效改善膨胀混凝土的孔结构分布. 展开更多
关键词 膨胀混凝土 内养护剂 超强吸水树脂 变形性能 微观分析
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基于SAP吸水膨胀橡胶的耐温耐盐性能 被引量:12
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作者 李秀辉 吴江渝 +1 位作者 杨鹏 郭三维 《材料工程》 EI CAS CSCD 北大核心 2010年第4期33-35,41,共4页
以反相悬浮聚合法合成P(AANa/AMPS/DMDAAC)两性共聚高吸水树脂(SAP),并引发溶胀在SAP中的丙烯酸丁酯和丙烯酸进行原位共聚合,制备疏水改性高吸水树脂。将丁腈橡胶、改性高吸水树脂、补强剂和其他助剂借助混炼机混炼均匀,在硫化成型机上... 以反相悬浮聚合法合成P(AANa/AMPS/DMDAAC)两性共聚高吸水树脂(SAP),并引发溶胀在SAP中的丙烯酸丁酯和丙烯酸进行原位共聚合,制备疏水改性高吸水树脂。将丁腈橡胶、改性高吸水树脂、补强剂和其他助剂借助混炼机混炼均匀,在硫化成型机上高温硫化制备吸水膨胀橡胶(WSR)。研究盐溶液种类、盐溶液浓度以及环境温度对WSR的质量吸水膨胀倍率的影响,并对吸水后的WSR进行热重分析。结果表明:盐溶液中阳离子浓度越大,化合价越高,对WSR吸水性能影响越明显,吸液膨胀倍率越小;在对WSR进行一系列不同温度下的吸液性能研究时发现,WSR在120℃具有较好的吸水膨胀性能。在环境温度达到175℃时,WSR达到失水平衡。 展开更多
关键词 吸水膨胀橡胶 高吸水树脂 耐温性 耐盐性 疏水改性
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金属离子对聚丙烯酸钾-丙烯酰胺共聚型SAP交替吸水吸盐特征的影响 被引量:4
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作者 李云开 许廷武 +3 位作者 周春发 赵群 林雄财 杨培岭 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2010年第3期39-42,共4页
采用丙烯酸与丙烯酰胺单体共聚法制备高吸水树脂(SAP)是提高吸水树脂性能的有效途径之一。选取两种聚丙烯酸钾-丙烯酰胺共聚型高吸水树脂,系统研究了四种金属离子对其交替吸水吸盐特征的影响。结果表明,金属离子对SAP有较强的抑制作用,... 采用丙烯酸与丙烯酰胺单体共聚法制备高吸水树脂(SAP)是提高吸水树脂性能的有效途径之一。选取两种聚丙烯酸钾-丙烯酰胺共聚型高吸水树脂,系统研究了四种金属离子对其交替吸水吸盐特征的影响。结果表明,金属离子对SAP有较强的抑制作用,四种金属阳离子对两种SAP吸水倍率及最大吸水能力的影响顺序为去离子水<K+<Na+<Ca2+<Fe3+,K+、Na+等一价离子对SAP吸盐特征的影响具有良好的恢复特性,而Ca2+、Fe3+等高价阳离子不具备可恢复特性。聚丙烯酸钾-丙烯酰胺共聚型SAP吸去离子水后的水凝胶并非经典三维网络交联结构,而是呈现出一个个形状及大小各异的蜂窝状立体交联网格膜结构,而吸四种金属离子后的SAP水凝胶内部结构存在形态各异的微形态特征。 展开更多
关键词 高吸水树脂 金属离子 交替 特征 微形态结构
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高吸水树脂(SAP)对砂浆与混凝土性能的影响 被引量:14
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作者 刘成虎 王辉 +1 位作者 任冶 王旺 《武汉理工大学学报(交通科学与工程版)》 2015年第6期1190-1193,共4页
混凝土内养护可以明显改善混凝土的自收缩,提高混凝土强度.研究了高吸水树脂(SAP)对砂浆工作性及混凝土自收缩和强度的影响规律.试验结果表明,以每立方米砂浆或混凝土中通过SAP向其中均匀引入15kg的养护用水为基准,把SAP与水的不同比例... 混凝土内养护可以明显改善混凝土的自收缩,提高混凝土强度.研究了高吸水树脂(SAP)对砂浆工作性及混凝土自收缩和强度的影响规律.试验结果表明,以每立方米砂浆或混凝土中通过SAP向其中均匀引入15kg的养护用水为基准,把SAP与水的不同比例掺入砂浆中,测试其流动度,确定了m(SAP)∶m(水)=1∶25的最佳比例,并以此比例掺入砂浆与混凝土中.分析了搅拌时间对掺加SAP的砂浆流动度的影响,为SAP在砂浆中的实际应用提供了一些建议.砂浆和混凝土引入预吸水的SAP后可明显提高其强度和自收缩变形且SAP的内养护效果随水胶比的降低更加显著. 展开更多
关键词 高吸水树脂(sap) 砂浆 混凝土 流动度 自收缩 强度
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