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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

    碳化與氯鹽共同作用下混凝土劣化的研究綜述
    碳化與氯鹽共同作用下混凝土劣化的研究綜述
    • 肖薇薇1,張紀剛1,2,張君博3,王鵬剛1,2,金祖權1,2,劉錦昆4
    2019年第12期
    摘要
    引用本文
    摘 要:碳化作用與高濃度氯離子侵蝕雙重作用下的混凝土結構更容易發生耐久性問題。通過分析碳化作用與氯離子侵蝕對混凝土的破壞機理,根據國內外學者對碳化與氯離子侵蝕共同作用下的相關研究,綜述了碳化與氯離子侵蝕共同作用下的相互影響及原因,并指出了未來試驗研究方向和建議。 Abstract: Based on the analysis of the damage mechanism of carbonation and chloride ion erosion on concrete, the research summarizes the interaction between carbonation and chloride ion erosion and the reasons, and points out the research directions and suggestions in the future.
    肖薇薇,張紀剛,張君博,等.碳化與氯鹽共同作用下混凝土劣化的研究綜述[J].混凝土與水泥制品,2019(12):24-28. XIAO W W,ZHANG J G,ZHANG J B,et al.Summary of the Research on Concrete Degradation under Combined Action of Carbonation and Chloride[J].China Concrete and Cement Products,2019(12):24-28.
    沖擊回波法評價混凝土質量研究綜述
    沖擊回波法評價混凝土質量研究綜述
    • 趙 祺1,桑 源1,高金麟1,楊英姿1,隋良志2,朱衛中1,3
    2019年第12期
    摘要
    引用本文
    摘 要:回顧了沖擊回波法在評價混凝土質量的研究現狀和主要應用,介紹了沖擊回波法的基本原理,分析了該方法在評價混凝土強度、檢測構件尺寸、缺陷以及評價混凝土耐久性方面的原理及應用,總結了該方法評價混凝土質量的優勢和不足,為今后該技術廣泛的工程應用提出了進一步的研究方向。 Abstract: This paper reviews the current situation and main application of impact-echo method in evaluating the quality of concrete. Firstly, the basic principle of impact-echo method is introduced. And then principles and applications are analyzed in evaluating concrete strength, detecting structure size and defects, as well as evaluating concrete durability. Meanwhile, the advantages and disadvantages of this method to assess concrete quality are summarized. Finally, further research directions are pointed out for the wide range of engineering applications of this novel technology in the future.
    低收縮高黏結黑色高性能混凝土的性能試驗研究
    低收縮高黏結黑色高性能混凝土的性能試驗研究
    • 夏中升1,2,沙建芳1,2,劉建忠1,2,郭 飛1,2,徐海源1,2
    2019年第12期
    摘要
    引用本文
    摘 要:研究了著色劑、外加劑摻量、配合比參數等對混凝土力學性能、水化產物形成、收縮變形性能、耐磨損能力的影響規律,再通過對既有混凝土界面進行不同的預處理方式,研究了界面粗糙度、干燥狀態等對新舊混凝土界面黏結性能的影響。結果表明:高摻量鐵黑降低混凝土力學性能,碳黑與鐵黑復配有助于提升力學性能;著色劑粒子的加入有助于氫氧化鈣的結晶形成,但對于鈣礬石影響較??;混凝土的耐磨損性能與水膠比、含氣量等試驗參數相關,降低漿體含氣量、選取合適的水膠比來獲得較高的基體強度,可提升混凝土的耐磨損性能。采用膠材水化溫升抑制和收縮補償復合技術,可實現混凝土分階段全過程收縮變形調控。較高的界面混凝土強度等級、較大的表面粗糙度以及表面預濕處理,有助于提高新舊混凝土界面黏結性能。 Abstract: The influence mechanism of colorants, admixtures and mix parameters on the surface color and workability of concrete, as well as its influence on the mechanical properties, shrinkage and deformation properties and wear resistance of concrete were studied. In addition, the influence of interface roughness and drying state on the bonding properties of new and old concrete interface was studied by different pretreatment methods of existing concrete interface. The results show that high content of iron black reduces the mechanical properties of concrete, and the combination of carbon black and iron black helps to improve the mechanical properties. The addition of colorant particles helps to form calcium hydroxide crystals, but has little effect on ettringite. The abrasion resistance of concrete is related to the test parameters such as water-binder ratio and air content. Reducing the air content of slurry and choosing appropriate water-binder ratio to obtain higher matrix strength can improve the abrasion resistance of concrete. By using hydration temperature rise inhibitor and high performance expansion agent, shrinkage suppression compensation can be realized in the whole stage. Higher strength grade of interfacial concrete, greater surface roughness and surface pre-wetting treatment are helpful to improve the interfacial bonding performance of new and old concrete.
    夏中升,沙建芳,劉建忠,等.低收縮高黏結黑色高性能混凝土的性能試驗研究[J].混凝土與水泥制品,2019(12):12-17. XIA Z S,SHA J F,LIU J Z,et al.Experimental Study on Performance of Low Shrinkage and High Bond Black High Performance Concrete[J].China Concrete and Cement Products,2019(12):12-17.
    摻鎳鐵渣-礦渣復合微粉混凝土配合比設計
    摻鎳鐵渣-礦渣復合微粉混凝土配合比設計
    • 祁 皚,劉旭宏,楊綿越,李 征
    2019年第12期
    摘要
    引用本文
    摘 要:以配制強度等級為C30、C35,坍落度達100~140 mm的摻鎳鐵渣-礦渣復合微粉混凝土(鎳-礦混凝土)為例,進行了鎳-礦混凝土的配合比設計。首先,測定了鎳鐵渣-礦渣復合微粉摻量為10%~50%的復合水泥膠砂的28d抗壓強度,定義了不同復合微粉摻量下的復合水泥強度折減系數。然后,以普通混凝土配合比設計方法中的保羅米公式為基準,采用復合水泥強度折減系數對其進行修正,初步計算了復合微粉摻量為10%~50%的鎳-礦混凝土配合比。最后,經過試配和調整,配制出了滿足強度和坍落度要求的C30、C35鎳-礦混凝土,從而確定了最終配合比。試驗結果表明:對于鎳-礦混凝土,該配合比設計方法是可行的。 Abstract: Simply replacing cement with ferronickel slag powder of the equal mass is often adverse to maintaining the concrete strength. Therefore, mix design of concrete containing a compound admixture of ferronickel slag-slag micro (F-S) powder (referred as F-S concrete hereafter) was investigated. The target concrete strength grade was C30 and C35, and the specified slump was 100~140 mm. This mix design consisted of the following three steps. Firstly, according to the tested 28 d compressive strength of the composite cement mortar with F-S powder content ranging from 10% to 50%, the strength reduction factor of composite cement mortar with different F-S powder content was defined. Secondly, the preliminary mix proportions of F-S concrete were calculated by the modified Bolomy’s formula. Thirdly, after several rounds of trial and adjustment, the final mix proportions of the target C30 and C35 F-S concrete were determined. Results from the experimental tests confirm the applicability of the proposed method to design the mix proportions of F-S concrete.
    祁皚,劉旭宏,楊綿越,等.摻鎳鐵渣-礦渣復合微粉混凝土配合比設計[J].混凝土與水泥制品,2019(12):7-11. QI A,LIU X H,YANG M Y,et al.Mix Proportion Design of Concrete Containing Compound Admixture of Ferronickel Slag-slag Micro Powder[J].China Concrete and Cement Products,2019(12):7-11.
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