第五期_2013_《混凝土與水泥制品》雜志社

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第五期

含氣量對石灰石粉與低品質粉煤灰雙摻綠色混凝土性能的影響研究

徐國強1,2，高林1,2，丁鋒3，齊國才3

２０13年第5期

摘要

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摘??要：通過在石灰石粉與低品質粉煤灰雙摻綠色混凝土中摻加引氣劑，使新拌混凝土的含氣量在3%～5%之間，研究了含氣量對此類混凝土的長期抗壓強度、抗凍性能和抗氯離子滲透性能的影響。結果表明，引氣劑的摻入使得石灰石粉與低品質粉煤灰雙摻綠色混凝土的長期抗壓強度有所降低，但可以明顯提高此類混凝土的抗凍性能，而對此類混凝土的抗氯離子滲透性能影響不大。Abstract:Throughmixingairentrainingagent,theaircontentoffreshconcretewithlimestonepowderandlow-qualityflyashisbetween3%to5%.Theinfluencesofaircontentonthelong-termcompressivestrength,frostresistanceandtheabilitytoresistchlorideionpenetrationofgreenconcreteareresearched.Theresultsshowthattheairentrainingagentmakesconcrete，slong-termcompressivestrengthreduce,butitcanobviouslyimprovethefrostresistanceofgreenconcrete,andithaslittleeffectontheabilitytoresistchlorideionpenetrationofconcrete.

煤矸石植生生態混凝土的制備和性能研究

徐榮進，劉榮桂，薛冬杰，何政卿

２０13年第5期

摘要

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摘要：通過相關實驗，研究了不同摻量情況下的自燃煤矸石植生型生態混凝土的制備工藝和性能。試驗結果表明，隨著煤矸石集料摻量的逐步提高，生態混凝土強度逐步下降，但下降幅度不大，pH值適中，可以滿足植生生態混凝土的功能要求。隨著集料級配的增大，生態混凝土的強度逐步下降，孔隙率逐步提高。采用P·O 42.5水泥、20～40mm煤矸石、中砂、外加劑ZS-2等原材料配制的植生型生態混凝土，在強度、pH值、孔隙率等方面均可滿足植物生長的要求。 Abstract: The preparation process and properties of coal gangue eco-concrete for planting has been discussed in the condition of different addition amounts of coal gangue through the relevant experiments. The results show that with the increase amount of coal gangue, the strength of concrete decreases gradually but its decrease range is somewhat, and the pH value is moderate. The strength and the pH value can meet the need of the functional requirements of eco-concrete for planting. With the increase of the aggregate gradation, the strength of concrete also decreases gradually but the porosity of concrete increases step by step. The coal gangue eco-concrete for planting prepared by P·O 42.5 cement, 20~40mm coal gangue, medium sand, ZS-2 admixture can meet the demand of plants growth in strength, pH value, porosity.

人工挖孔樁與基礎底板逆作施工技術

成軍

２０13年第5期

摘要

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摘要：以南京某工程為例，介紹了先施工底板后施工樁基礎的逆作施工方法，解決了該工程因設計變更而造成的支護樁支護能力不足問題，確保了工程的順利施工。 Abstract: Taking one project in Nanjing, the inverse construction method of the first floor construction then the construction of the pile foundation is introduced, which can solve the problem of design change causing the supporting ability of supporting piles insufficient, and ensure the engineering construction smoothly.

C50清水混凝土的配制與施工技術

劉士紅1，黃義雄2，修曉明2，林熙1，殷新博1，季錫賢1

２０13年第5期

摘要

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摘要：研究了C50清水混凝土配合比設計技術要點以及生產組織和混凝土現場澆注施工、養護過程中的關鍵措施。通過優選水泥、粉煤灰和微珠，調整粉料比例以及砂率、用水量，遴選高性能外加劑，配制出了具有適宜粘聚性和工作性能的清水混凝土。 Abstract: The key technology of mix proportion design of fair-faced concrete is studied. At the same time, the producing organization, casting process and curing technology in situ are also presented. The fair-faced concrete with appropriate cohesiveness and workability is prepared by means of optimizing cement, fly ash, micro-sphere, high performance admixture, binder proportion, sand ratio and unit water consuption.

基于CAN總線的菱鎂板養護房自動控制系統設計

周梅，楊向萍

２０13年第5期

摘要

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摘??要：基于現有的菱鎂板生產線實際生產情況，設計了一種新型用于菱鎂板生產線養護房自動控制的裝置。該裝置以單片機為核心，利用CAN總線技術和傳感器技術組建了菱鎂板養護房的自動控制系統的節點及網絡架構。介紹了系統總體結構、主要的硬件設計和關鍵的軟件流程。?Abstract:Basedontheexistingmagnesiumboardproductionlineactualsituation,anewtypeofequipmentformagnesiumboardproductionlinemaintenanceroom'sautomaticcontrolsystemisdesigned.Thisequipmentusesthesingle-chipmicrocomputerasitscore,withCANbusandsensortechnology,thenodeofautomaticcontrolsystemaboutmagnesiumboardmaintenanceroomandthenetworkstructureareorganized.Theoverallstructureofthesystem,themaindesignofhardwareandthekeysoftwareprocesshavebeenintroducedinthispaper.

再生骨料自密實堆石混凝土墻體的力學性能研究

王海超1,2，高義龍2，安雪暉3，徐錫權4，周立軍4，高淑玲5

２０13年第5期

摘要

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摘要：研究了再生骨料自密實混凝土堆石墻體在靜荷載作用下的力學性能及破壞形態，結果表明，再生骨料自密實混凝土墻體具有較高的承載力，特別是抗壓強度遠遠大于普通毛石砌體，而且自密實混凝土和再生骨料之間的粘結性能良好；其破壞形態與天然大直徑骨料堆石混凝土相近，破壞性質亦屬于脆性破壞，但下降段較緩。再生骨料自密實堆石混凝土可取代普通毛石砌體，其工程應用前景廣闊。 Abstract: The failure mode and mechanical properties of recycled aggregate-filled self-compacting concrete wall under static load are studied. The results show that the recycled aggregate self-compacting concrete wall can bear higher load than ordinary rubble stone masonry, especially its compressive strength, and it has good bonding properties between self-compacting concrete and recycled aggregates. Its failure mode is similar with the big natural aggregate-filled concrete’s. Its destruction property belongs to brittle failure, but the stress-strain curve decreases slowly. Therefore, recycled aggregate-filled self-compacting concrete can replace ordinary rubble stone masonry and has further engineering application prospect.

某抽水蓄能電廠廠房結構現狀與厚板加固動力分析

王國安1，田國華2

２０13年第5期

摘要

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摘要：以國內某大型蓄水發電廠廠房為研究對象，建立三維有限元模型。對廠房現狀結構進行動力計算并與現場模態試驗進行比較，分析廠房振動產生裂縫的原因。在已有模型基礎上對廠房厚板加固方案進行了的模態與瞬態的計算。計算結果表明：在頻率方面，厚板加固提高廠房結構的剛度同時降低其頻率，但效果不顯著；在振型方面，厚板加固可以有效地減少廠房的局部振動；動力響應方面，相對廠房現狀結構，厚板結構的廠房動應力有一定的減小，但個別點也存在動應力增加的現象。 Abstract: Based on the powerhouse of a pumped-storage power station, a three-dimensional FEM model is established. Compared dynamic calculation with modal experiment, the reason of the cracks by the vibration of the powerhouse is analyzed. Based on the current model, the modal calculation and transient calculation of thick slab strengthening plan of the powerhouse are carried out. The results indicate that thickening concrete slab can increase the rigidity of the powerhouse and decrease the frequency a litter; and the part vibration can be decreased obviously. The dynamic stress of the strengthening powerhouse is less than that of the current powerhouse, but some points are opposite.

不同材料加固農村砌體房屋動力性能分析

周戟，白曉霞，竇遠明，劉熙媛

２０13年第5期

摘要

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摘要：為了分析研究農村砌體結構房屋在不同加固形式下的抗震性能，應用ANSYS有限元軟件模擬分析打包帶與碳纖維兩種材料加固農村砌體結構房屋后的整體動力特性改善效果，通過研究結構破壞現象、結構地震加速度響應、極限位移以及應力分布等對兩種不同加固形式的砌體結構的抗震性能做出綜合評價。研究結果表明：加固后結構的整體性能得到了改善，結構應力分布更均勻，并且結構裂縫呈現多而細的現象，碳纖維加固后結構的地震加速度響應及極限位移最小，打包帶加固結構次之，兩種不同材料的加固形式明顯提高了結構的抗震性能。 Abstract: In order to acquire the seismic performance of the strengthening rural masonry structure in different forms, by means of ANSYS software simulating and analyzing the dynamic characteristics improvement effect of masonry structure strengthened with packing belt or carbon fiber sheet, the seismic performance of reinforced masonry structure in different forms is evaluated by researching the failure mode of structure, the earthquake acceleration response, the maximum displacement and the stress distribution etc.. The research results show that after the masonry structure strengthened, the integrality performance of the structure is improved, the stress distribution is much more uniformity, the number of masonry structural cracks increases, but the width and length of masonry structural cracks change much less. The earthquake acceleration response and limit minimum displacement of rural masonry structure reinforced by carbon fiber sheet are the best, the ones reinforced by packaging tapes are the second, and two kinds of different reinforcement form can obviously improve the seismic behavior of the structure.

緩粘結部分預應力混凝土梁剛度試驗研究

馮新，周先雁

２０13年第5期

摘要

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摘要：緩粘結預應力混凝土是近二十年出現的一種新型獨特預應力體系。為了解研究這一新型預應力混凝土構件的受力性能和使用性能，本文以手工的方式制作了緩粘結預應力筋，并對3根緩粘結部分預應力混凝土T形梁進行了短期剛度的試驗研究和理論分析，在試驗研究的基礎上，結合試驗梁的特性和國家現行標準規范，建立了緩粘結部分預應力混凝土梁短期剛度的計算公式。研究結果表明，按修正公式計算的撓度值與試驗結果吻合較好，為這一新型預應力體系的實際應用提供了參考依據。 Abstract: Retard-bonded prestressed concrete which has appeared in recent twenty years is a new and distinctive prestressed system. For the research on mechanical behavior and service property of retard-bonded prestressed concrete members, retard-bonded prestressed strands are made by manual work in this paper. Experimental research and theoretical analysis on short-term stiffness of three retard-bonded partially prestressed concrete T-beams are carried out under static loadings. Based on the experiment research, connected with the characteristic of test beams and the national current standard, the calculation formulas on the short-term stiffness of retard-bonded partially prestressed concrete T-beams are proposed. The results show that the calculated values given by the modified formulas are identical with the test results, which provides theoretical reference for the actual project application of the new retard-bonded prestressed concrete system.

纖維對泡沫混凝土比強度的影響

魏天偉，譚偉，陳明，劉紅飛

２０13年第5期

摘要

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摘要：用化學發泡法制作了泡沫混凝土，并對纖維與泡沫混凝土協同工作提高泡沫混凝土比強度進行了試驗研究。通過對纖維摻量和長度的試驗，探索了纖維在泡沫混凝土中的利用率，并探討了纖維在泡沫混凝土中的分布均勻度問題。 Abstract: The foam concrete was made by using the chemical bubbling method, and the combined action between fiber and foam concrete to improve the concrete specific strength was researched. Through the experimental study on the mixing amount and length of fibers, the utilization of fibers in foam concrete was explored, meanwhile, some problems about distribution evenness of fibers in foam concrete were discussed.

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