苏州混凝土水泥制品研究院有限公司

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发布时间:2020-01-06 00:00:00
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混 凝 土 研 究

抗裂水泥对混凝土性能的影响研究
抗裂水泥对混凝土性能的影响研究
  • 宋少民,李紫翼
2020年1期   No.285   P24-28
摘要
引用本文
摘要:为明确抗裂水泥对于现代混凝土的适用性与技术优势,针对抗裂水泥与普通硅酸盐水泥配制的混凝土强度、和易性、抗裂性能等进行了对比研究。试验结果表明,抗裂水泥对减水剂的相容性优于普通水泥,水化热低,在净浆和混凝土中开裂敏感性低,抗裂水泥配制的混凝土和易性良好,强度低于普通水泥混凝土,但均满足各强度等级要求,且有一定的强度保证率,对提升混凝土抗裂性能有利。
Abstract: In order to clarify the applicability and technical advantages of crack-resistant cement for modern concrete, the strength, workability and crack resistance of concrete prepared by crack-resistant cement and ordinary Portland cement were compared. The test results show that the compatibility of the crack-resistant cement to the water-reducing agent is better than that of ordinary cement, the hydration heat and the cracking sensitivity are lower in the paste and concrete respectively, and the concrete prepared by the crack-resistant cement has better workability. The strength is lower than that of ordinary cement concrete, but it satisfies the requirements of various strength grades, and has a certain strength guarantee rate, which is beneficial to improve the crack resistance of concrete.
宋少民,李紫翼.抗裂水泥对混凝土性能的影响研究[J].混凝土与水泥制品,2020(1):24-28.
SONG S M,LI Z Y.Study on the Effect of Crack-resistant Cement on Concrete Performance[J].China Concrete and Cement Products,2020(1):24-28.
低品位石灰石粉与粉煤灰复掺效应对C50 海工混凝土抗Cl<sup>-</sup>迁移的影响
低品位石灰石粉与粉煤灰复掺效应对C50 海工混凝土抗Cl-迁移的影响
  • 李 涛1,金 磊1,申瑞娟1, 陈 林2,雷 栋3
2020年1期   No.285   P21-23+28
摘要
引用本文
摘要:分析了低品位石灰石粉和粉煤灰不同掺配比例的复合效应对C50海工混凝土抗氯离子迁移性能及强度的影响,试验结果表明:随着低品位石灰石粉掺量的增加,C50海工混凝土3d、7d、28d抗压强度增长幅度均在10%以上;将低品位石灰石粉按胶凝材料总体质量的15%替代粉煤灰与其进行1∶1复掺时,C50海工混凝土的氯离子迁移系数与电通量值均为最低,分别降低了70.5%和67.4%,抗Cl-迁移性能达到最佳;SEM结果表明,低品位石灰石与粉煤灰的复掺比例为1∶1时,低品位石灰石粉微集料效应与粉煤灰的火山灰的复合效应可以改变混凝土的空隙特征,提高了混凝土的密实性、强度及抗渗性能。 Abstract: Theinfluenceofdifferentmixingratiosoflow-gradelimestonepowderandflyashonchloridemigrationresistanceofC50Marineengineeringconcreteisanalyzed,thetestresultsshowthatwiththeincreaseofthecontentoflow-gradelimestonepowder,the3d,7dand28dcompressivestrengthofC50Marineconcreteshowsanupwardtrendwithanincreaseofmorethan10%.Whenlow-gradelimestonepowderreplacesflyashwith15%ofthetotalmassofcementitiousmaterialandperforms1∶1compounding,thechloridemigrationcoefficientandelectricfluxvalueofC50marineconcretearethelowest,respectivelyreducingby70.5%and67.4%,butwiththebestchloridemigrationresistance.BycomparingSEMphotosofconcretetestblockwithdifferentmixingratios,whenthemixingratiooflow-gradelimestoneandflyashis1∶1,itsmicro-aggregateeffectandpozzolaniceffectofflyasharefullysuperimposed,theresultingcompositeeffectincreasesthecompactness,strengthandimprovesimpermeabilityoftheconcrete.
李涛,金磊,申瑞娟,等.低品位石灰石粉与粉煤灰复掺效应对C50海工混凝土抗Cl-迁移的影响[J].混凝土与水泥制品,2020(1):21-23+28.
LI T,JIN L,SHEN R J,et al.Composite Effect of Low Grade Limestone Powder and Fly Ash on the Resistance of C50 Marine Concrete to Chloride Ion Migration[J].China Concrete and Cement Products,2020(1):21-23+28.
冻融损伤对引气混凝土中钢筋锈蚀的影响研究
冻融损伤对引气混凝土中钢筋锈蚀的影响研究
  • 陈际洲1,赵铁军1,张 鹏1,管 廷2,王越虹3
2020年1期   No.285   P16-20
摘要
引用本文
摘要:为研究冻融损伤环境下引气混凝土内部钢筋锈蚀规律和机理,同时考虑混凝土保护层厚度对内部钢筋锈蚀的影响,试验设计了不同保护层厚度的配筋普通混凝土和引气混凝土试件,分别利用半电池电位法和线性极化法测定了不同冻融循环次数下,试件内部钢筋的半电池电位值和腐蚀电流密度值。试验结果表明,随着冻融循环次数的增加,混凝土试件内部钢筋的半电池电位绝对值和腐蚀电流密度值均有显著增加,试件的抗锈蚀能力降低;但在相同冻融循环次数下,引气混凝土较普通混凝土具有更好的抗钢筋锈蚀性能;增加保护层厚度可以明显提高配筋混凝土的抗钢筋锈蚀能力。
Abstract: In order to study the steel corrosion in the reinforced concrete added with air entraining agent under freeze-thaw environment, and the influence of cover thickness on the steel corrosion, the ordinary reinforced concrete and air entraining concrete with different cover thickness were prepared, and the half cell potential and the linear polarization methods were used to evaluate the state of steel corrosion in different concrete specimens. The results show that the value of half cell potential and the linear polarization both increase with the increase of freeze-thaw cycles, which demonstrates the resistance to steel corrosion decrease. The resistance to steel corrosion of air entraining concrete is higher than that of the ordinary concrete, and the resistance to steel corrosion also raises with the increase of cover thickness.
陈际洲,赵铁军,张鹏,等.冻融损伤对引气混凝土中钢筋锈蚀的影响研究[J].混凝土与水泥制品,2020(1):16-20.
CHEN J Z, ZHAO T J,ZHANG P,et al.The Study on Steel Corrosion in Air Entraining Concrete under the Coupling Effects of Freeze-thaw Damage[J].China Concrete and Cement Products,2020(1):16-20.
基于SO<sub>4</sub><sup>2</sup><sup>-</sup>吸附与反应的硬化水泥基材料中Cl<sup>-</sup>传输与固化机制
基于SO42-吸附与反应的硬化水泥基材料中Cl-传输与固化机制
  • 周 莹1,2,石 亮1,3,穆 松1,2
2020年1期   No.285   P11-15
摘要
引用本文
摘要:通过自行设计的离子空间传输试验装置,分析研究了硫酸盐和氯盐的空间传输性能,并通过测试硫酸盐和氯盐共存时产物的组成和形貌,分析硫酸根离子对氯离子固化行为的影响。结果表明,在SO42-与Cl-共存的情况下,Cl-在不同时间和空间传输量较纯溶液时均有减小,说明SO42-会阻碍Cl-的传输;SO42-与Cl-均可与水泥基材料的水化产物发生反应,其中SO42-反应生成AFt,Cl-反应生成Friedel盐,当两者共存时,Friedel盐生成量减少,说明SO42-会减弱Cl-的固化能力,从而减弱混凝土结构中氯盐的腐蚀破坏程度。 Abstract: Thespacetransportpropertiesofsulfateandchloridesaltswereanalyzedbyself-designedionspacetransfertestdevice.Thecompositionandmorphologyoftheproductsinthecoexistenceofsulfateandchloridesaltsweretestedtoanalyzethecuringbehaviorofsulfateionsagainstchlorideions.TheresultsshowthatinthecaseofcoexistenceofSO42-andCl-,Cl-decreasesindifferenttimeandspacethanpuresolution,indicatingthat SO42- willhinderthetransportofCl-.Both SO42- andCl-canreactwiththehydrationproductsofcement-basedmaterials,inwhich SO42- reactstoformAFt,andCl-reactstoformFriedel′ssalt.Whenthetwocoexist,theamountofFriedel′ssaltisreduced,indicatingthat SO42- willweakenthecuringabilityofCl-,therebyweakeningconcrete.Thedegreeofcorrosiondamageofchloridesaltsinthestructure.
周莹,石亮,穆松.基于SO42-吸附与反应的硬化水泥基材料中Cl-传输与固化机制[J].混凝土与水泥制品,2020(1):11-15.
ZHOU Y, SHI L,MU S.Cl- Transport and Solidification Mechanism in Hardened Cement-based Materials Based on SO42- Adsorption and Reaction[J].China Concrete and Cement Products,2020(1):11-15.
超高性能混凝土配合比设计模型、水化硬化机理及微观结构的研究进展
超高性能混凝土配合比设计模型、水化硬化机理及微观结构的研究进展
  • 张高展1,魏 琦1,丁庆军2,葛竞成1
2020年1期   No.285   P6-10+15
摘要
引用本文
摘要:从超高性能混凝土(UHPC)配合比设计模型入手,综述了目前UHPC配合比模型研究现状,并在此基础上,介绍了其水化硬化和微观结构形成机理,总结了UHPC现有的不足并展望了其未来研究的方向,可为轻质低收缩UHPC的设计和开发提供参考。
Abstract: Starting with the Ultra-high Performance Concrete(UHPC) fit ratio design model, the current situation of UHPC co-comparison research is summarized. And on this basis, its hydration hardening and microstructure formation mechanism is introduced, the existing shortcomings of UHPC is summarized and the future research direction is look forward, which can provide a reference for the design and development of light low-shrink UHPC.
张高展,魏琦,丁庆军,等.超高性能混凝土配合比设计模型、水化硬化机理及微观结构的研究进展[J].混凝土与水泥制品,2020(1):6-10+15.
ZHANG G Z,WEI Q,DING Q J,et al.A Review on Model of Mixture Design, Mechanism of Hydration and Harden, Microstructure of Ultra-high Performance Concrete[J].China Concrete and Cement Products,2020(1):6-10+15.
镍铁渣混凝土的力学性能、干缩行为及其与浆体孔结构的关系
镍铁渣混凝土的力学性能、干缩行为及其与浆体孔结构的关系
  • 王 申,李保亮,曹瑞林,贾子健,张亚梅
2020年1期   No.285   P1-5
摘要
引用本文
摘要:制备了不同掺量的镍铁渣混凝土,对其抗压强度、劈裂抗拉强度、弹性模量和干燥收缩进行了测试,并使用压汞法对同配比净浆的孔结构进行了表征。结果表明,镍铁渣混凝土的抗压强度随镍铁渣掺量的提高出现先提高后下降的现象,这与孔结构变化有显著关系。当镍铁渣掺量在20%以上时,混凝土早期强度增长较为缓慢,经90 d龄期养护后基本可以弥补早期形成的强度差。镍铁渣的掺入降低了混凝土的劈裂抗拉强度,但混凝土的弹性模量提高。蒸汽养护可以一定程度激发镍铁渣的活性,但并不能弥补其取代水泥造成的强度损失。20%掺量以内的镍铁渣混凝土具有比纯水泥混凝土较小的干燥收缩,这与镍铁渣掺入后混凝土孔隙率降低、弹性模量提高等相关。
Abstract: Concrete with different FNS(Ferronickel slag) contents was prepared, and its compressive strength, splitting tensile strength, elastic modulus and drying shrinkage were tested. The pore structures of the pastes with the same proportions were analyzed by mercury intrusion porosimetry (MIP). The experimental results show that the compressive strength of FNS concrete increases firstly and then decreases as the FNS replacement goes higher, which has a significant correlation with the change of pore structures. When the FNS replacement is over 20%, the development of strength of FNS concretes is slower than that of plain concrete and this difference can be compensated after 90 days’ curing. Moreover, the FNS weakens the splitting tensile strength but improves the elastic modulus of concrete. The FNS can be partly activated by steam curing, but it cannot cover the loss of strength due to the decrease in cement content. FNS concrete with an FNS content less than 20% has a smaller drying shrinkage than plain concrete, which can be attributed to the lower porosity and the higher elastic modulus of concrete.
王申,李保亮,曹瑞林,等.镍铁渣混凝土的力学性能、干缩行为及其与浆体孔结构的关系[J].混 凝土与水泥制品,2020(1):1-5.
WANG S,LI B l,CAO R L,et al.Mechanical Properties, Drying Shrinkage and Their Relation with Pore Structure of Concrete with Ferronickel Slag[J].China Concrete and Cement Products,2020(1):1-5.
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