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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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    混凝土研究

    聚羧酸減水劑和含泥量對水泥漿體流變性能的影響
    聚羧酸減水劑和含泥量對水泥漿體流變性能的影響
    • 溫金保1,2,3,4,杜志芹1,2,3,4,唐修生1,2,3,4,劉興榮1,2,3,4
    2022年第4期
    摘要
    引用本文
    摘 ? 要:通過測試流動度和由Bingham流變模型擬合所得的流變參數,研究了未摻與摻聚羧酸減水劑(TX50)兩種條件下含泥量對水泥漿體流變性能的影響因素及其規律。結果表明:含泥量對水泥漿體塑性黏度的影響程度明顯大于其對流動度的影響;水灰比與未摻減水劑的水泥漿體的流動度、塑性黏度、屈服應力分別呈線性關系、冪函數關系、指數關系;減水劑與RP8抑制組分的摻入均可增加水泥漿體的流動度,降低塑性黏度,且對流動度的影響程度明顯大于對塑性黏度的影響程度。 Abstract: By testing the fluidity and the rheological parameters fitted by the Bingham rheological model, the influence factors and laws of clay content on the rheological properties of cement paste under the two conditions of not admixed and admixed with polycarboxylic acid water reducer(TX50) were studied. The results show that the effect of clay content on the plastic viscosity of cement paste is significantly greater than its impact on fluidity. The water-cement ratio and the fluidity, plastic viscosity, and yield stress of the cement paste without water reducer are linear, power function, and exponential respectively. The mixing of water reducer and RP8 inhibiting component can increase the fluidity of cement paste and reduce the plastic viscosity, and the impact on fluidity is significantly greater than the impact on plastic viscosity.
    溫金保,杜志芹,唐修生,等.聚羧酸減水劑和含泥量對水泥漿體流變性能的影響[J].混凝土與水泥制品,2022(4):1-5. WEN J B,DU Z Q,TANG X S,et al.Influence of Polycarboxylic Acid Water Reducer and Clay Content on Rheological Properties of Cement Paste[J].China Concrete and Cement Products,2022(4):1-5.
    海洋環境下海水海砂水泥砂漿抗壓強度的時變規律
    海洋環境下海水海砂水泥砂漿抗壓強度的時變規律
    • 趙雪冰1,李華勇1,陳祖兵1,黃昭宇1,陳宗平1,2
    2022年第4期
    摘要
    引用本文
    趙雪冰,李華勇,陳祖兵,等.海洋環境下海水海砂水泥砂漿抗壓強度的時變規律[J].混凝土與水泥制品,2022(4):6-9,18. ZHAO X B,LI H Y,CHEN Z B,et al.Time-varying Laws of Compressive Strength of Seawater Sea Sand Cement Mortar in the Marine Environment[J].China Concrete and Cement Products,2022(4):6-9,18.
    多壁羧基化碳納米管改性水泥砂漿抗氯離子滲透性能研究
    多壁羧基化碳納米管改性水泥砂漿抗氯離子滲透性能研究
    • 段艷剛1,朱 華2
    2022年第4期
    摘要
    引用本文
    摘 ? 要:研究了一種多壁羧基碳納米管(CNT-COOH)對水泥砂漿抗氯離子滲透性能的影響。為了得到均勻的懸浮液,將CNT-COOH分散在蒸餾水中,再進行超聲波處理。分別按水泥質量的0.01%、0.05%和0.10%的CNT-COOH進行配合設計,制備了水泥砂漿試件,并根據RCM法測定了氯離子擴散系數。結果表明:當CNT-COOH摻量從0.01%增加至0.05%,氯離子擴散深度和擴散系數均增加;但CNT-COOH摻量繼續增加至0.10%時,氯離子擴散深度和擴散系數大幅下降。此外,壓汞試驗結果表明,當CNT-COOH摻量為0.10%時,CNT-COOH通過消除大孔和降低孔隙率細化了孔徑,使得水泥砂漿的微觀結構更加密實。 Abstract: The effect of multi-walled carbon nanotubes(CNT-COOH) on chloride resistance of cement mortar was studied. In order to obtain a uniform suspension, CNT-COOH was well-dispersed in distilled water and then treated by ultrasonic. The mix proportion of the cement mortar with 0.01%, 0.05% and 0.10% of the cement quality was design, and the chloride diffusion coefficient was determined by the RCM method. The results show that with the increase of CNT-COOH content from 0.05% to 0.05%, the diffusion depth and diffusion coefficient of chloride ion increase, and continuing to increase CNT-COOH content to 0.10%, the diffusion coefficient of chloride has dropped drastically. The results of MIP show that when the CNT-COOH content is 0.10%, CNT-COOH can refine the pore distribution by eliminating the large pore and reducing the porosity, which makes the microstructure of cement mortar compact.
    段艷剛,朱華.多壁羧基化碳納米管改性水泥砂漿抗氯離子滲透性能研究[J].混凝土與水泥制品,2022(4):10-13. DUAN Y G,ZHU H.Study on Chloride Resistance of Cement Mortar Modified with Multi-walled Carboxylated Carbon Nanotubes[J].China Concrete and Cement Products,2022(4):10-13.
    頁巖陶?;炷恋闹苽渑c保溫性能研究
    頁巖陶?;炷恋闹苽渑c保溫性能研究
    • 楊 航1,戴紹斌1,李正學2,吳思遙1,尚麗詩1
    2022年第4期
    摘要
    引用本文
    摘 ? 要:主要研究了水膠比、頁巖陶粒密度等級、含水率三因素對頁巖陶?;炷恋目箟簭姸群蛯嵯禂档挠绊?。結果表明:在一定范圍內,水膠比與頁巖陶?;炷恋目箟簭姸?、導熱系數分別呈負相關和正相關;頁巖陶粒的密度等級與抗壓強度、導熱系數分別呈正相關和負相關,含水率與抗壓強度和導熱系數均呈負相關。與普通C30混凝土相比,所制備的LC30頁巖陶?;炷恋母擅芏冉档土?5.5%,導熱系數降低了50%。 Abstract: The influence of water-binder ratio, shale ceramsite density grade and water content on the compressive strength and thermal conductivity of shale ceramsite concrete was studied. The results show that the water-binder ratio is negatively correlated and positively correlated with the compressive strength and thermal conductivity of shale ceramsite concrete respectively within a certain range. The density grade of shale ceramsite is positively and negatively correlated with the compressive strength and thermal conductivity, respectively, while the water content is negatively correlated with the compressive strength and thermal conductivity. Based on the test results, compared with ordinary C30 concrete, the dry density and thermal conductivity of LC30 shale ceramsite concrete prepared by the optimization are reduced by about 25.5% and 50%.
    楊航,戴紹斌,李正學,等.頁巖陶?;炷恋闹苽渑c保溫性能研究[J].混凝土與水泥制品,2022(4):14-18. YANG H,DAI S B,LI Z X,et al.Study on Preparation and Thermal Insulation Performance of Shale Ceramsite Concrete[J].China Concrete and Cement Products,2022(4):14-18.
    機制砂MB值對軌道交通工程用混凝土性能的影響
    機制砂MB值對軌道交通工程用混凝土性能的影響
    • 陳秀鳴1,陳 洪2,潘瑋璠1,史星祥2,郭耀雄1,許志揚2,張立力2
    2022年第4期
    摘要
    引用本文
    摘 ? 要:研究了不同母巖巖性、石粉含量、泥粉含量和類型與機制砂MB值的關系,確立了軌道交通工程用混凝土性能的主要影響因素,以實現對機制砂MB值的定量調控。以軌道交通工程典型C20、C35和C50混凝土為研究對象,開展了MB值對其工作性、抗壓強度和抗氯離子滲透性的影響研究。結果表明:MB值主要取決于機制砂中的泥粉含量和類型,與母巖巖性和石粉含量的關系不大;MB值的增加會顯著降低混凝土的工作性,混凝土強度等級越高對工作性的敏感程度越高,且對摻聚羧酸減水劑混凝土工作性的劣化效果比摻萘系減水劑更顯著;當MB值在0.85~2.00之間時,三種混凝土的抗壓強度均有不同程度的提升,達到最大值后,抗壓強度出現不同程度的下降,C50混凝土的下降幅度最大;適當的MB值可以提高C35混凝土的抗氯離子滲透性;C50混凝土的抗氯離子滲透性會隨著MB值的提高而逐漸降低。 Abstract: The relationship between different parent rock lithology, stone powder content, mud powder content and type and MB value of manufactured sand was studied, and the main influencing factors of concrete performance for rail transit engineering were established, so as to realize quantitative regulation of MB value of manufactured sand. Taking the typical C20, C35 and C50 concrete of rail transit engineering as the research object, the effect of MB value on workability, compressive strength and resistance to chloride ion permeability of concrete was studied. The results show that the MB value mainly depends on the content and type of mud powder in the manufactured sand, and has little relationship with the lithology of the parent rock and the content of stone powder. The increase of the MB value will significantly reduce the workability of concrete, and the higher the concrete strength grade, the higher the sensitivity to workability, and the deterioration effect of polycarboxylate superplasticizer on concrete workability is more significant than that of naphthalene-based superplasticizer. When the MB value is between 0.85 and 2.00, the compressive strengths of the three concretes are improved to different degrees, and after reaching the maximum value, the compressive strength decreases to varying degrees, and the C50 concrete has the largest decrease. Appropriate MB value can improve the chloride ion permeability resistance of C35 concrete. The chloride ion permeability resistance of C50 concrete will gradually decrease with the increase of MB value.
    陳秀鳴,陳洪,潘瑋璠,等.機制砂MB值對軌道交通工程用混凝土性能的影響[J].混凝土與水泥制品,2022(4):19-24. CHEN X M,CHEN H,PAN W F,et al.Effect of MB Value of Manufactured Sand on Performance of Concrete Used in Rail Transit Engineering[J].China Concrete and Cement Products,2022(4): 19-24.
    超高性能混凝土(UHPC)研究綜述
    超高性能混凝土(UHPC)研究綜述
    • 王 暉
    2022年第4期
    摘要
    引用本文
    摘 ? 要:介紹了超高性能混凝土(UHPC)的基本制備原理、配合比、生產工藝、材料性能以及在國內工程領域的應用概況,對比分析了UHPC和普通混凝土的性能差異,總結了國內UHPC在理論研究和實際應用方面取得的成果,提出了促進UHPC大規模應用急需解決的問題。 Abstract: The basic preparation principle, mix proportion, production process, material properties and application of ultra-high performance concrete (UHPC) in the domestic engineering field are introduced. The performance differences between UHPC and ordinary concrete are compared and analyzed, and the achievements of domestic UHPC in theoretical research and practical application are summarized, and the urgent problems to be solved to promote the large-scale application of UHPC are put forward.
    王暉.超高性能混凝土(UHPC)研究綜述[J].混凝土與水泥制品,2022(4):25-28. WANG H.Review of Research on Ultra-high Perfoamance Concrete[J].China Concrete and Cement Products,2022(4):25-28.
    基于CT圖像的混凝土細觀損傷數值模擬研究
    基于CT圖像的混凝土細觀損傷數值模擬研究
    • 周雙雙1,劉京紅1,2,李兵兵3,張仕樺4,劉 婷5
    2022年第4期
    摘要
    引用本文
    摘 ? 要:針對混凝土細觀損傷機理進行了研究,將混凝土看作由骨料、砂漿和孔隙組成的細觀多相復合材料,通過CT技術對其單軸壓縮損傷機制進行了分析,并對所得結果處理后通過MIMICS軟件建立了相應三維細觀模型,結合ABAQUS工具進行了數值模擬研究。結果表明:數值模擬得到的混凝土損傷圖可以較好地反映混凝土試件單軸受壓的整個損傷過程;混凝土試件在單軸壓縮試驗中發生的是張拉-剪切復合破壞,數值模擬得到的應力、應變云圖與試驗結果相符。 Abstract: The mesoscopic damage mechanism of concrete was studied, and concrete was regarded as a meso multiphase composite material composed of aggregate, mortar and pore. The uniaxial compression damage mechanism was analyzed by CT technology. Based on the results, the corresponding 3D mesoscopic model was established by MIMICS software, and then numerical simulation was carried out using ABAQUS software. The results show that the whole damage process of concrete under uniaxial compression can be well reflected by numerical simulation, and the tensile-shear composite failure occurs in the uniaxial compression test. The stress-strain cloud diagram obtained by numerical simulation is consistent with the test results.
    周雙雙,劉京紅,李兵兵,等.基于CT圖像的混凝土細觀損傷數值模擬研究[J].混凝土與水泥制品,2022(4):29-32. ZHOU S S,LIU J H,LI B B,et al.Numerical Simulation Study of Concrete Microscopic Damage Based on CT Image[J].China Concrete and Cement Products,2022(4):29-32.
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