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    蘇州混凝土水泥制品研究院有限公司

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    混 凝 土 研 究

    鎳鐵渣混凝土的力學性能、干縮行為及其與漿體孔結構的關系
    鎳鐵渣混凝土的力學性能、干縮行為及其與漿體孔結構的關系
    • 王 申,李保亮,曹瑞林,賈子健,張亞梅
    2020年1期 ? No.285 ? P1-5
    摘要
    引用本文
    摘要:制備了不同摻量的鎳鐵渣混凝土,對其抗壓強度、劈裂抗拉強度、彈性模量和干燥收縮進行了測試,并使用壓汞法對同配比凈漿的孔結構進行了表征。結果表明,鎳鐵渣混凝土的抗壓強度隨鎳鐵渣摻量的提高出現先提高后下降的現象,這與孔結構變化有顯著關系。當鎳鐵渣摻量在20%以上時,混凝土早期強度增長較為緩慢,經90 d齡期養護后基本可以彌補早期形成的強度差。鎳鐵渣的摻入降低了混凝土的劈裂抗拉強度,但混凝土的彈性模量提高。蒸汽養護可以一定程度激發鎳鐵渣的活性,但并不能彌補其取代水泥造成的強度損失。20%摻量以內的鎳鐵渣混凝土具有比純水泥混凝土較小的干燥收縮,這與鎳鐵渣摻入后混凝土孔隙率降低、彈性模量提高等相關。
    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.鎳鐵渣混凝土的力學性能、干縮行為及其與漿體孔結構的關系[J].混 凝土與水泥制品,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.
    超高性能混凝土配合比設計模型、水化硬化機理及微觀結構的研究進展
    超高性能混凝土配合比設計模型、水化硬化機理及微觀結構的研究進展
    • 張高展1,魏 琦1,丁慶軍2,葛競成1
    2020年1期 ? No.285 ? P6-10+15
    摘要
    引用本文
    摘要:從超高性能混凝土(UHPC)配合比設計模型入手,綜述了目前UHPC配合比模型研究現狀,并在此基礎上,介紹了其水化硬化和微觀結構形成機理,總結了UHPC現有的不足并展望了其未來研究的方向,可為輕質低收縮UHPC的設計和開發提供參考。
    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.
    張高展,魏琦,丁慶軍,等.超高性能混凝土配合比設計模型、水化硬化機理及微觀結構的研究進展[J].混凝土與水泥制品,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.
    基于SO<sub>4</sub><sup>2</sup><sup>-</sup>吸附與反應的硬化水泥基材料中Cl<sup>-</sup>傳輸與固化機制
    基于SO42-吸附與反應的硬化水泥基材料中Cl-傳輸與固化機制
    • 周 瑩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:通過自行設計的離子空間傳輸試驗裝置,分析研究了硫酸鹽和氯鹽的空間傳輸性能,并通過測試硫酸鹽和氯鹽共存時產物的組成和形貌,分析硫酸根離子對氯離子固化行為的影響。結果表明,在SO42-與Cl-共存的情況下,Cl-在不同時間和空間傳輸量較純溶液時均有減小,說明SO42-會阻礙Cl-的傳輸;SO42-與Cl-均可與水泥基材料的水化產物發生反應,其中SO42-反應生成AFt,Cl-反應生成Friedel鹽,當兩者共存時,Friedel鹽生成量減少,說明SO42-會減弱Cl-的固化能力,從而減弱混凝土結構中氯鹽的腐蝕破壞程度。?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.
    周瑩,石亮,穆松.基于SO42-吸附與反應的硬化水泥基材料中Cl-傳輸與固化機制[J].混凝土與水泥制品,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.
    凍融損傷對引氣混凝土中鋼筋銹蝕的影響研究
    凍融損傷對引氣混凝土中鋼筋銹蝕的影響研究
    • 陳際洲1,趙鐵軍1,張 鵬1,管 廷2,王越虹3
    2020年1期 ? No.285 ? P16-20
    摘要
    引用本文
    摘要:為研究凍融損傷環境下引氣混凝土內部鋼筋銹蝕規律和機理,同時考慮混凝土保護層厚度對內部鋼筋銹蝕的影響,試驗設計了不同保護層厚度的配筋普通混凝土和引氣混凝土試件,分別利用半電池電位法和線性極化法測定了不同凍融循環次數下,試件內部鋼筋的半電池電位值和腐蝕電流密度值。試驗結果表明,隨著凍融循環次數的增加,混凝土試件內部鋼筋的半電池電位絕對值和腐蝕電流密度值均有顯著增加,試件的抗銹蝕能力降低;但在相同凍融循環次數下,引氣混凝土較普通混凝土具有更好的抗鋼筋銹蝕性能;增加保護層厚度可以明顯提高配筋混凝土的抗鋼筋銹蝕能力。
    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.
    陳際洲,趙鐵軍,張鵬,等.凍融損傷對引氣混凝土中鋼筋銹蝕的影響研究[J].混凝土與水泥制品,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.
    低品位石灰石粉與粉煤灰復摻效應對C50 海工混凝土抗Cl<sup>-</sup>遷移的影響
    低品位石灰石粉與粉煤灰復摻效應對C50 海工混凝土抗Cl-遷移的影響
    • 李 濤1,金 磊1,申瑞娟1, 陳 林2,雷 棟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摻配比例的復合效應對C50海工混凝土抗氯離子遷移性能及強度的影響,試驗結果表明:隨著低品位石灰石粉摻量的增加,C50海工混凝土3d、7d、28d抗壓強度增長幅度均在10%以上;將低品位石灰石粉按膠凝材料總體質量的15%替代粉煤灰與其進行1∶1復摻時,C50海工混凝土的氯離子遷移系數與電通量值均為最低,分別降低了70.5%和67.4%,抗Cl-遷移性能達到最佳;SEM結果表明,低品位石灰石與粉煤灰的復摻比例為1∶1時,低品位石灰石粉微集料效應與粉煤灰的火山灰的復合效應可以改變混凝土的空隙特征,提高了混凝土的密實性、強度及抗滲性能。?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.
    李濤,金磊,申瑞娟,等.低品位石灰石粉與粉煤灰復摻效應對C50海工混凝土抗Cl-遷移的影響[J].混凝土與水泥制品,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.
    抗裂水泥對混凝土性能的影響研究
    抗裂水泥對混凝土性能的影響研究
    • 宋少民,李紫翼
    2020年1期 ? No.285 ? P24-28
    摘要
    引用本文
    摘要:為明確抗裂水泥對于現代混凝土的適用性與技術優勢,針對抗裂水泥與普通硅酸鹽水泥配制的混凝土強度、和易性、抗裂性能等進行了對比研究。試驗結果表明,抗裂水泥對減水劑的相容性優于普通水泥,水化熱低,在凈漿和混凝土中開裂敏感性低,抗裂水泥配制的混凝土和易性良好,強度低于普通水泥混凝土,但均滿足各強度等級要求,且有一定的強度保證率,對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.抗裂水泥對混凝土性能的影響研究[J].混凝土與水泥制品,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.
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