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    蘇州混凝土水泥制品研究院有限公司

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    發布時間:2020-01-06 00:00:00
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    微珠對隧道工程混凝土性能的影響及機理研究
    Mechanism and Effect of Microbeads on the Properties of Concrete for the Tunnel Engineering
    2022年第1期
    微珠;力學性能;干燥收縮;水化熱;早期抗裂性能;微觀機理
    Microbead; Mechanical property; Dry shrinkage performance; Heat hydration; Early cracking resistance; Micro-mechanism
    2022年第1期
    10.19761/j.1000-4637.2022.01.012.06
    國家自然科學基金項目(52079048);江蘇省重點研發計劃項目(BE2020780)。
    王 濤1,胡 琪1,吳紹明2,儲洪強1,陳 峰2,趙文文1,丁天云1,蔣林華1
    1.河海大學 力學與材料學院,江蘇 南京 211100;2.廣州市高速公路有限公司,廣東 廣州 510000

    王 濤1,胡 琪1,吳紹明2,儲洪強1,陳 峰2,趙文文1,丁天云1,蔣林華1

    王濤,胡琪,吳紹明,等.微珠對隧道工程混凝土性能的影響及機理研究[J].混凝土與水泥制品,2022(1):12-16,21.

    WANG Tao, HU Qi, WU Shao-ming,et al.Mechanism and Effect of Microbeads on the Properties of Concrete for the Tunnel Engineering[J].China Concrete and Cement Products,2022(1):12-16,21.

    瀏覽量:
    1000
    摘 ? 要:針對廣州新白云國際機場隧道工程建設中大體積混凝土的溫度裂縫問題,通過復摻微珠和粉煤灰,研究了微珠摻量對混凝土的力學性能、干燥收縮、水化熱以及早期抗裂性能的影響,并采用SEM分析了微珠對水泥水化反應的作用機理。結果表明:當礦物摻合料總量一定時,隨著微珠摻量的增加,混凝土的力學性能早期變化較小,后期呈現出先增加后下降的趨勢,且微珠摻量為10%時,混凝土養護60 d的抗壓強度、劈裂抗拉強度以及彈性模量最高;混凝土干縮率隨著微珠摻量的增加而減小,且這種趨勢隨齡期的增加而增大,當微珠摻量15%時,60 d混凝土的干縮率最??;當微珠摻量為10%時,混凝土早期抗裂性能最佳,平板試件表面24 h內無裂縫;微珠摻量對膠凝材料水化熱總量影響較小,但對水化放熱峰值及峰值產生時間影響較大;微珠可以加速漿體早期的水化進程,減少硬化漿體的孔隙,使其結構更密實。 Abstract: In order to solve the temperature crack problem of the mass concrete structure in the construction of the Guangzhou New Baiyun International Airport tunnel engineering, the mechanism and effect of microbeads content on the macro-performance of concrete were performed, which specifically includes mechanical properties, dry shrinkage performance, heat hydration and early cracking resistance. Moreover, SEM was used for exploring the influence of microbeads on the hydration of cement. The results show that with the increase of microbeads content, the mechanical properties of concrete present no changes in the early stages, and increases first, then decreases in the later stages when the total content of mineral admixture is unchanged. When microbeads content is 10%, the compressive strength, splitting tensile strength and elastic modulus of concrete at 60 d are the highest. The dry shrinkage rates of concrete decrease with the increase of microbeads content, and the improvement becomes even bigger with the increase of curing age. The dry shrinkage of concrete at 60 d is the smallest when the content of microbeads is 15%. The early cracking resistance of concrete is the best with 10% microbeads, which can be manifested as no obvious cracks on the surface of the flat specimen within 24 h. Microbeads has little impact on the total hydration heat, and has a great influence on the peak and its arrival time of hydration exothermic rate. Microbeads can accelerate the early hydration process of cement and decrease the porosity of cement paste, which can make microstructure denser.
    英文名 : Mechanism and Effect of Microbeads on the Properties of Concrete for the Tunnel Engineering
    刊期 : 2022年第1期
    關鍵詞 : 微珠;力學性能;干燥收縮;水化熱;早期抗裂性能;微觀機理
    Key words : Microbead; Mechanical property; Dry shrinkage performance; Heat hydration; Early cracking resistance; Micro-mechanism
    刊期 : 2022年第1期
    DOI : 10.19761/j.1000-4637.2022.01.012.06
    文章編號 :
    基金項目 : 國家自然科學基金項目(52079048);江蘇省重點研發計劃項目(BE2020780)。
    作者 : 王 濤1,胡 琪1,吳紹明2,儲洪強1,陳 峰2,趙文文1,丁天云1,蔣林華1
    單位 : 1.河海大學 力學與材料學院,江蘇 南京 211100;2.廣州市高速公路有限公司,廣東 廣州 510000

    王 濤1,胡 琪1,吳紹明2,儲洪強1,陳 峰2,趙文文1,丁天云1,蔣林華1

    王濤,胡琪,吳紹明,等.微珠對隧道工程混凝土性能的影響及機理研究[J].混凝土與水泥制品,2022(1):12-16,21.

    WANG Tao, HU Qi, WU Shao-ming,et al.Mechanism and Effect of Microbeads on the Properties of Concrete for the Tunnel Engineering[J].China Concrete and Cement Products,2022(1):12-16,21.

    摘要
    參數
    結論
    參考文獻
    引用本文

    摘   要:針對廣州新白云國際機場隧道工程建設中大體積混凝土的溫度裂縫問題,通過復摻微珠和粉煤灰,研究了微珠摻量對混凝土的力學性能、干燥收縮、水化熱以及早期抗裂性能的影響,并采用SEM分析了微珠對水泥水化反應的作用機理。結果表明:當礦物摻合料總量一定時,隨著微珠摻量的增加,混凝土的力學性能早期變化較小,后期呈現出先增加后下降的趨勢,且微珠摻量為10%時,混凝土養護60 d的抗壓強度、劈裂抗拉強度以及彈性模量最高;混凝土干縮率隨著微珠摻量的增加而減小,且這種趨勢隨齡期的增加而增大,當微珠摻量15%時,60 d混凝土的干縮率最??;當微珠摻量為10%時,混凝土早期抗裂性能最佳,平板試件表面24 h內無裂縫;微珠摻量對膠凝材料水化熱總量影響較小,但對水化放熱峰值及峰值產生時間影響較大;微珠可以加速漿體早期的水化進程,減少硬化漿體的孔隙,使其結構更密實。

    Abstract: In order to solve the temperature crack problem of the mass concrete structure in the construction of the Guangzhou New Baiyun International Airport tunnel engineering, the mechanism and effect of microbeads content on the macro-performance of concrete were performed, which specifically includes mechanical properties, dry shrinkage performance, heat hydration and early cracking resistance. Moreover, SEM was used for exploring the influence of microbeads on the hydration of cement. The results show that with the increase of microbeads content, the mechanical properties of concrete present no changes in the early stages, and increases first, then decreases in the later stages when the total content of mineral admixture is unchanged. When microbeads content is 10%, the compressive strength, splitting tensile strength and elastic modulus of concrete at 60 d are the highest. The dry shrinkage rates of concrete decrease with the increase of microbeads content, and the improvement becomes even bigger with the increase of curing age. The dry shrinkage of concrete at 60 d is the smallest when the content of microbeads is 15%. The early cracking resistance of concrete is the best with 10% microbeads, which can be manifested as no obvious cracks on the surface of the flat specimen within 24 h. Microbeads has little impact on the total hydration heat, and has a great influence on the peak and its arrival time of hydration exothermic rate. Microbeads can accelerate the early hydration process of cement and decrease the porosity of cement paste, which can make microstructure denser.

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    (1)當礦物摻合料總量不變時,混凝土后期力學性能隨著微珠摻量的增加呈現先增大后減小的趨勢,當微珠摻量為10%時,試件的后期力學性能最佳。
    (2)隨著微珠摻量的增加,混凝土干縮率減小,且這種趨勢隨時間的增加而增大;摻10%微珠的試件抗裂性能最好,24 h內試件表面無明顯裂縫。
    (3)與單摻粉煤灰試件相比,摻入5%、10%微珠時,水泥漿體7 d的水化放熱總量和放熱速率峰值明顯下降,但微珠摻量為15%時,水泥漿體7 d的水化放熱總量和放熱速率峰值上升。
    (4)微珠可以促進水泥早期的水化反應,減少硬化漿體的孔隙,且復摻10%微珠時,硬化漿體的結構更密實。

    [1] 余建杰,宋固全,吳浪.基于MIDAS的大體積混凝土樁承臺溫度場有限元分析[J].混凝土與水泥制品,2012(5):34-37.
    [2] 曹明莉,張聰.某筏板基礎大體積混凝土裂縫分析與控制[J].混凝土與水泥制品,2011(11):56-59.
    [3] 白偉,李驍春,張建,等.基于數值分析的早期混凝土溫度控制技術[J].混凝土與水泥制品,2009(3):18-19.
    [4] 王靖,王萬金,夏義兵,等.超細粉煤灰對混凝土強度及水化產物的影響[J].混凝土與水泥制品,2016(12):24-26.
    [5] 姚韋靖,龐建勇.超細粉煤灰與粉煤灰混凝土力學性能對比試驗研究[J].混凝土與水泥制品,2015(12):10-13.
    [6] 鄭玉飛.低水膠比復合膠凝材料的水化程度及孔結構研究[D].北京:北京交通大學,2018.
    [7] 嚴捍東.廢渣特性及其多元復合對水泥基材料高性能的貢獻與機理[D].南京:東南大學,2001.
    [8] 馬正先,周傳貴,宋沛霖,等.復合礦物摻合料對超早強支座砂漿性能的影響[J].混凝土與水泥制品,2018(6):1-6.
    [9] LI Y,BAO J L,GUO Y L.The Relationship Between Autogenous Shrinkage and Pore Structure of Cement Paste with Mineral Admixtures[J].Construction and Building Materials,2010,24(10):1855-1860.
    [10] 賈福杰,李長成,劉立.摻超細灰混凝土早齡期體積穩定性研究[J].混凝土與水泥制品,2017(3):19-22.
    [11] 高英力.超細粉煤灰高性能公路路面水泥混凝土早期收縮變形及抗裂性能研究[D].長沙:中南大學,2005.
    [12] 徐海源,沙建芳,劉建忠,等.粉煤灰對水泥基材料流動性能影響及評價方法研究[J].混凝土與水泥制品,2014(12):86-90.
    [13] WANG Q,WANG D Q,CHEN H H.The Role of Fly Ash Microsphere in the Microstructure and Macroscopic Properties of High-strength Concrete[J].Cement and Concrete Composites,2017,83:125-137.
    [14] HAN X,YANG J B,FENG J J,et al.Research on Hydration Mechanism of Ultrafine Fly Ash and Cement Composite[J].Construction and Building Materials,2019,227:116697.
    [15] 陳友治,張遠,甘戈金,等.水泥-微珠二元膠材體系的水化特征及性能研究[J].新型建筑材料,2018,45(11):41-44.
    [16] 楊夢卉.水工超高性能混凝土微細顆粒效應研究[D].武漢:武漢大學,2017.
    [17] FAIZU A S,STEVE W M S.Compressive Strength and Durability Properties of High Volume Fly Ash(HVFA) Concretes Containing Ultrafine Fly Ash(UFFA)[J].Construction and Building Materials,2015,82:192-205.
    [18] ZHANG W,WU F,ZHANG Y.Early Hydration and Setting Process of Fly Ash-blended Cement Paste Under Different Curing Temperatures[J].Journal of Wuhan University of Technology,2020,35(3):551-560.
    [19] 侯東偉,張君,孫偉.基于早期變形特征的混凝土凝結時間的確定[J].硅酸鹽學報,2009,37(7):1079-1084,1091.
    [20] 商博明.粉煤灰結構及粉煤灰膠凝材料水化的微觀研究[D].西安:西安建筑科技大學,2006.
    [21] 丁慶軍,韓冀豫,黃修林,等.微珠與硅灰、粉煤灰水化活性的對比研究[J].武漢理工大學學報,2011,33(3):54-57,115.

    王濤,胡琪,吳紹明,.微珠對隧道工程混凝土性能的影響及機理研究[J].混凝土與水泥制品,2022(1):12-16,21.

    WANG Tao, HU Qi, WU Shao-ming,et al.Mechanism and Effect of Microbeads on the Properties of Concrete for the Tunnel Engineering[J].China Concrete and Cement Products,2022(1):12-16,21.

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