第十二期_2019_《混凝土與水泥制品》雜志社

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第十二期

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

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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

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

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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

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

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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.

預制混凝土箱涵結構設計理論與施工技術研究綜述

何建平，蔡玉軍，孫建龍

２０19年第12期

摘要

引用本文

摘要：結合預制混凝土箱涵的設計理論和施工方法，深入分析了現有預制混凝土箱涵結構力學簡化計算方法、有限元數值模擬分析方法。系統論述了現澆法、直接頂進工法和管幕-箱涵法的研究概況、進展及其優勢進行了系統地論述與總結。并在此基礎上，提出了研究中存在的關鍵技術和具體問題，探討了預制混凝土箱涵結構的發展前景及趨勢。 Abstract: According to the design theory and construction method of underground precast concrete box culvert, two structural calculation methods, simplified calculation of structural mechanics and finite element numerical simulation, and several kinds of construction methods of box culvert are discussed, including cast-in-place method, jacking method and pipe-curtain-box culvert method et al. Combined with existing research, the research status and hot spots at home and abroad are analyzed systematically, summary have also been given in this paper. On this basis, some problems existing in the research are put forward, and the development prospect of underground box culvert is forecasted.

何建平,蔡玉軍,孫建龍.預制混凝土箱涵結構設計理論與施工技術研究綜述[J].混凝土與水泥制品,2019(12):33-37+42. HE J P,CAI Y J,SUN J L.Summary of the Research on Design Theory and Construction Technology of Precast Concrete Box Culvert Structure[J].China Concrete and Cement Products,2019(12):33-37+42.

蒸壓無石棉纖維水泥板鼓泡分層現象原因及解決措施

徐定豐

２０19年第12期

摘要

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摘要：結合實際生產，分析了蒸壓無石棉纖維水泥板生產過程中鼓泡分層現象的原因，并結合實際生產，從提高坯料黏結力（優化原材料加工處理、回水回料控制、外加劑的應用、板材的壓制工藝、優化預養、蒸養制度等）和優化養護制度出發，提出了相應的解決措施，以期為蒸壓無石棉纖維水泥板的生產提供參考借鑒。 Abstract: Based on the actual production, the causes of the bubble and layering phenomenon in the production process of autoclaved asbestos-free fiber cement board were analyzed, and in combination with the actual production, in order to improve the bonding strength of the blank (optimize the processing and treatment of raw materials, return water and return material) Control, application of additives, pressing process, optimization of pre curing, steam curing system, etc.) and optimization of curing system, the corresponding solutions are put forward in order to provide a reference for the production of steam pressed asbestos-free fiber cement board.

徐定豐.蒸壓無石棉纖維水泥板鼓泡分層現象原因及解決措施[J].混凝土與水泥制品,2019(12):38-42. XU D F.Causes and Solutions of the Bubbling and Delamination in Autoclaved Asbestos-Free Fiber Cement Board[J].China Concrete and Cement Products,2019(12):38-42.

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

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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.

透水混凝土試驗方法研究

王愛勤，張承志，俞鋒，駱靜靜，劉遠祥，滿麗瑩

２０19年第12期

摘要

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摘要：結合前期的研究成果及在制定T/CSTM 00040—2019《透水混凝土試驗方法》團體標準中的創新思路，積極探索了透水混凝土成型方式及評價新拌透水混凝土工作性、透水混凝土透水性能的科學方法，以保證評價指標的科學準確性及與工程實際的一致性。 Abstract: Combined with the previous research results and innovative ideas in the formulation of the group standard of T/CSTM 00040—2019 Test Methods for Pervious Concrete, the forming method of pervious concrete and the scientific method to evaluate the workability of fresh pervious concrete and permeable property of pervious concrete were actively explored to ensure the scientific accuracy of the evaluation index and the consistency with the actual engineering.

楊劍,溫曉凱,張增起,等.古建筑修復用聚合物砂漿的配合比優化及微結構表征[J].混凝土與水泥制品,2019(12):1-6. YANG J,WEN X K,ZHANG Z Q,et al.The Optimization of Mix Proportion and Microstructural Characteristics of Polymer Mortar Used for Ancient Building Maintenance[J].China Concrete and Cement Products,2019(12):1-6.

預應力混凝土空心板橋梁的結構可靠性評估

田煒

２０19年第12期

摘要

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摘要：通過對某預應力混凝土空心板橋梁進行現狀調查、混凝土強度、碳化試驗及靜動力性能試驗，建立有限元空間模型對橋梁進行了仿真分析及可靠性評估。結果表明，此橋梁橋墩碳化深度較大，空心板前5階振型以彎曲振型為主，沖擊系數接近規定值；基于動測參數剛度評價與靜力試驗剛度評價具有同等的可靠性；該橋技術狀況評定等級為四類，需盡快進行大修或改造。 Abstract： In order to conduct the reliability assessment of a certain bridge, the status quo of a prestressed concrete hollow slab and a spatial finite element model were carried out and developed for numerical simulation, and the concrete strength test, carbonization test, relevant static and dynamic mechanical test were also conducted for providing relative data. The results show that the depth of carbonation of the bridge pier is comparatively great, the main mode of the first five vibration modes of the concrete hollow slab is bending mode and the impact coefficient is closed to the regulated value. The stiffness evaluation based on the parameters obtained by dynamic test has the same reliability as that based on the parameters obtained by static test. It is revealed that the technical condition of this bridge is ranked as 4th, which indicates that further overhaul or reconstruction are required.

田煒.預應力混凝土空心板橋梁的結構可靠性評估[J].混凝土與水泥制品,2019(12):43-47. TIAN W.Structural Reliability Evaluation of Prestressed Concrete Hollow Slab Bridge[J].China Concrete and Cement Products,2019(12):43-47.

纖維對深部隧道用高性能混凝土滲透性能的影響

郭秋生，陳慶，蔣正武，何倍，徐春普

２０19年第12期

摘要

引用本文

摘要：研究了不同纖維摻加方式與摻量對深部隧道用C50高性能混凝土力學性能、抗氯離子侵蝕性能和表面透氣性能的影響，并對其影響機理進行了分析。結果表明，纖維的摻入能顯著提高混凝土的力學性能；當聚丙烯纖維體積摻量為0.6%時，混凝土的力學性能最好，28 d抗壓強度和劈裂抗拉強度相比于對照組分別提高了9.3%和13.2%，而混雜纖維混凝土的抗壓強度和劈裂抗拉強度都有一定的降低；混雜纖維對提高混凝土抗氯離子性能和降低表面透氣性能的作用明顯優于單種纖維，混雜纖維混凝土56 d電通量比單摻0.3%的聚丙烯纖維混凝土和單摻0.6%的木質素纖維混凝土分別降低了19.1%和15.5%，56 d表面透氣系數則分別降低了42.3%和16.7%；纖維不僅能夠填充混凝土內部的孔隙裂縫，還能消除混凝土內部“積水”，促進未水化水泥顆粒水化，使混凝土更加密實，從而提高混凝土的抗滲性和耐久性。 Abstract: The effects of mixing methods and dosages of different fibers on mechanical properties, resistance to chloride ion erosion and surface gas permeability of C50 high performance concrete for deep tunnels were studied, and the influence mechanism was analyzed. The results show that the incorporation of fibers can significantly improve the mechanical properties of concrete, when the volume of polypropylene fiber is 0.6%, the mechanical properties of concrete are the best. Compared with the control group, the 28 days compressive strength and splitting tensile strength of concrete increase by 9.3% and 13.2%, respectively, while the compressive strength and splitting tensile strength of multi-mixed fiber concrete decrease. The effects of multi-mixed fibers on improving the chloride ion resistance of concrete and reducing the surface gas permeability are obviously better than that of single-mixed fiber, the 56 days electric flux of multi-mixed fiber concrete decrease by 19.1% and 15.5%, which is lower than that of 0.3% polypropylene fiber concrete and 0.6% lignin fiber concrete, and the 56 days surface air permeability coefficient of multi-mixed fiber concrete decrease by 42.3% and 16.7%. The fiber can not only fills the pore cracks in concrete, but also eliminate the "water accumulation" inside concrete and promote the hydration of the unhydrated cement particles, thereby improving the impermeability and durability of the concrete.

郭秋生,陳慶,蔣正武,等.纖維對深部隧道用高性能混凝土滲透性能的影響[J].混凝土與水泥制品,2019(12):48-51. GUO Q S,CHEN Q,JIANG Z W,et al.Effects of Fibers on Permeability of High Performance Concrete for Deep Tunnels[J].China Concrete and Cement Products,2019(12):48-51.

混凝土用聚甲醛纖維的耐堿性能研究

王天琪1，楊鼎宜2,3，談永泉1，范志勇1

２０19年第12期

摘要

引用本文

摘??要：根據不同的水泥堿度設計了6種pH值的NaOH溶液對聚甲醛纖維（POM纖維）進行加速老化試驗，同時用基準水泥上層清液做POM纖維的常溫浸泡試驗，通過測試浸泡前后纖維的直徑和強度探究了POM纖維的耐堿性能，并對不同浸泡環境、不同浸泡時間下的纖維進行了微觀形貌分析和紅外測試，找出了不同浸泡條件下的時間對應關系。試驗結果表明，POM纖維在兩種浸泡環境下，隨著時間的延長，直徑逐漸增加，強度減小，POM纖維在pH=14的NaOH溶液中加溫浸泡6h相當于在基準水泥上層清液中常溫浸泡28d。POM纖維的腐蝕是一個逐層腐蝕的過程，堿溶液最先腐蝕纖維表面和內部雜質，其次腐蝕結構缺陷部分，發生C-O-C和CH2基團位移，導致纖維力學性能下降，但POM纖維整體結構骨架并沒有受到嚴重腐蝕，具有較好的耐堿性能。Abstract：6kindsofNaOHsolutionwithpHaccordingtodifferentcementalkalinityweredesignedtoacceleratetheagingtestofPOMfiber,andthebenchmarkcementsupernatantwasusedtomakePOMfiberatroomtemperatureimmersiontest.ThealkaliresistanceofPOMfiberwasinvestigatedbytestingthediameterandstrengthofthefibersbeforeandaftersoaking.Microscopicmorphologyanalysisandinfraredtestingwereperformedonthefibersunderdifferentsoakingtimesindifferentsoakingenvironmentstofindoutthetimecorrespondenceunderdifferentsoakingconditions.TheresultsshowthatthePOMfibergraduallyincreasesindiameterandstrengthafterprolongingintwokindsofimmersionenvironments.POMfiberisimmersedinNaOHsolutionwithpH=14for6h,whichisequivalenttothereferencecementsupernatantatroomtemperaturefor28d.ThecorrosionofPOMfiberisalayer-by-layercorrosionprocess,thealkalisolutionfirstcorrodesthefibersurfaceandinternalimpurities,andsecondlycorrodesthestructuraldefects,andtheC-O-CandCH2?groupsaredisplaced,resultinginadecreaseinfibermechanicalproperties.However,theoverallstructuralskeletonofthePOMfiberisnotseriouslycorrodedandhasgoodalkaliresistance.

王天琪,楊鼎宜,談永泉,等.混凝土用聚甲醛纖維的耐堿性能研究[J].混凝土與水泥制品,2019(12):52-55. WANG T Q,YANG D Y,TAN Y Q,et al.Study on Alkali Resistance of Polyacetal Fiber for Concrete[J].China Concrete and Cement Products,2019(12):52-55.

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