第十二期_2016_《混凝土與水泥制品》雜志社

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第十二期

碳纖維-石墨導電混凝土力學性能及受彎機敏性研究

宋凱，高培偉，孫亞飛，劉宏偉，張麗芳，陳敏

２０16年第12期

摘要

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摘要：為研究導電混凝土受彎過程的機敏性，在混凝土中摻入碳纖維和石墨來改善其力學及機敏性能，試驗研究了摻碳纖維和石墨導電混凝土的力學性能，建立了導電混凝土在受彎過程中荷載-撓度-電阻變化率的關系。在導電混凝土中適量用石墨代替碳纖維，可在不影響其力學性能的同時提高導電混凝土機敏性，對石墨-碳纖維導電混凝土撓度-電阻變化率進行擬合，得到撓度與電阻變化率關系的經驗公式，且相關性較好。 Abstract: In order to study the conductive concrete alertness bending process, graphite and carbon fiber were added to concrete to improve the mechanical and electrical properties. Experimental study on mechanical properties of graphite and carbon fiber electrically conductive concrete is carried out, and the load-deflection-resistivity change relationships of conductive concrete in the flexural load process are established. The results show that the right amount of incorporated graphite instead of carbon fiber in the conductive concrete can increase the alertness of conductive concrete without affecting its mechanical properties. The empirical formula of the relationship between the deflection and the rate of change of resistance of the graphite-carbon fiber conductive concrete is obtained, and the correlation is good.

無砂再生透水混凝土配合比設計

張松濤1，賈欣悅2，宋卓1，賈艷東1

２０16年第12期

摘要

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摘??要：為研究無砂再生透水混凝土最優配合比，選擇再生粗骨料粒徑為5～10mm和10～20mm兩種不同粒徑，分別以骨料目標孔隙率（15%、20%、25%）和水灰比（0.35、0.4、0.45、0.5）為主要指標制作試件。采用CJJ/T135—2009《透水水泥混凝土路面技術規程》中的配合比計算方法進行配合比設計。通過對試塊的抗壓強度、抗折強度、透水系數、實測孔隙率的測定綜合考慮透水混凝土各項指標，一個目標孔隙率可確定一個最優水灰比，從而獲得最優配合比。研究表明，在骨料粒徑為5～10mm、目標孔隙率15%時，水灰比為0.4；目標孔隙率20%時，水灰比為0.45的再生透水混凝土綜合性能最好。在骨料粒徑為10～20mm時，目標孔隙率25%、水灰比為0.4的再生透水混凝土綜合性能最好。Abstract：Tostudytheoptimalmixproportionofno-finesperviousrecycledconcrete,theparticlesizeofselectedrecycledcoarseaggregatewas5～10mmand10～20mm，thespecimensweremadefromaggregatetargetporosity(15%,20%,25%)andwatercementratio(0.35,0.4,0.45,0.5).ThemixproportioncalculationwasfinishedaccordingtothemethodinCJJ/T135—2009"TechnicalSpecificationsforPerviousConcretePavement".Throughthemeasurementofcompressivestrength,flexuralstrength,permeabilitycoefficientandmeasuredporosityofspecimens,andthecomprehensiveconsiderationofseveralkindsofindicatorofperviousconcrete,onetargetporositycandetermineanoptimalwatercementratio,finallytheoptimalmixproportionwasobtained.Theexperimentalresultsshowthatinthecaseofaggregateparticlesizeof5～10mm,theoverallperformanceofrecycledperviousconcreteisthebestwhenthetargetporosityis15%andwatercementratiois0.4,andthetargetporosityis20%andwatercementratiois0.4.Inthecaseofaggregateparticlesizeof10～20mm,recycledperviousconcretewithtargetporosityof20%andwatercementratioof0.4hasthebestoverallperformance.

鋼渣微粉對超高性能水泥基復合材料性能的影響

王虹1，郭麗萍1,2，孫偉1,2，馬瑞1

２０16年第12期

摘要

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摘要：研究了鋼渣微粉的火山灰活性和不同摻量對低水膠比超高性能水泥基復合材料的水化熱、流動度、抗折強度、抗壓強度的影響規律。試驗結果表明，鋼渣微粉具有比較高的火山灰活性，28d的活性指數可達到87.1；鋼渣微粉摻量為10%時，累積放熱量達到最大；當鋼渣微粉摻量大于10%時，隨著摻量的增加，累積放熱量隨之減少；鋼渣微粉顆粒近似球體，會提高極低水膠比超高性能水泥基復合材料的流動度；鋼渣微粉的摻入使超高性能水泥基復合材料的抗折強度先增加后減小，鋼渣微粉摻量為10%的超高性能水泥基復合材料抗折強度最高，高達25.8MPa；鋼渣微粉摻量在0~20%內，抗壓強度略有降低，但仍可滿足超高性能水泥基復合材料強度要求。證明了鋼渣微粉可作為膠凝材料制備極低水膠比超高性能水泥基復合材料的可能性。 Abstract: The pozzolanic reactivity of steel slag, the effects of different steel slag contents on heat of hydration, fluidity, flexural strength and compressive strength of ultra-high performance cementitious composites (UHPCC) were investigated. Experiment results indicate that the steel slag has higher pozzolanic reactivity up to 87.1 at 28 days. When 10% of the cement is replaced by steel slag powder, the fresh paste achieves the maximum of hydration heat, and the hydration heat decrease with the increase of replacing quantity of steel slag. The spherical morphology of steel slag leads to the increase of the fluidity of fresh paste. With the increase of replacement rate of steel slag, the flexural strength of UHPCC increases first then decreases, the flexural strength of UHPCC with the replacement of 10% cement can reach 25.8MPa at the highest. In addition, the compressive strength of UHPCC with the steel slag in 0~20% decreases slightly while still meets the UHPCC strength requirements, which prove the possibility of steel slag can be used as a sustainable cementitious material.

內摻硅樹脂對水泥基材料濕度擴散和干縮性能的影響

田礫，封云旭，王鵬剛，呂京錄

２０16年第12期

摘要

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摘要：水泥基材料的濕度擴散和干縮性能是影響其耐久性的重要方面。本文研究了高交聯硅樹脂乳液對水泥基材料濕度擴散和干縮性能的影響。高交聯硅樹脂乳液以辛基三甲氧基硅與丙基三甲氧基硅烷兩種單體為原料，通過乳液聚合的方式制成。結果表明，水泥基材料的失水量隨著環境相對濕度的降低而增大，由于摻加的硅樹脂乳液阻止了水泥基材料水化進程，能夠有效控制水泥基材料的早期收縮，使得摻加硅樹脂乳液的砂漿試塊的收縮量小于未處理的砂漿試塊。隨著硅樹脂乳液摻量的增加，砂漿試塊前期的干縮量減小，但干燥齡期越長，硅樹脂乳液的干縮影響越小。Abstract: The performances of humidity diffusion and shrinkage of cement-based materials are important aspects of the durability of concrete. The effects of highly crosslinked resin emulsion on shrinkage and the humidity diffusion of cement-based materials were studied. Two monomers octyl trimethoxy silane and propyl trimethoxy silane were made into highly crosslinked resin emulsion via emulsion polymerization synthesis method. The results showed that the amount of water loss of cement-based materials increased with the decrease of relative humidity. Silicone resin emulsion prevents the hydration process of cement-based materials, which controlled the early shrinkage of the cement-based materials effectively, so that the shrinkage of mortar test block with silicone resin emulsion is smaller than that of untreated mortar. With the increase of the silicon resin emulsion admixture, mortar initial shrinkage reduced, meanwhile, the longer specimen drying, the smaller the dry shrinkage of the silicone emulsion.

超細粉煤灰對混凝土強度及水化產物的影響

王靖，王萬金，夏義兵，賈方方，查炎鵬，彭丙杰

２０16年第12期

摘要

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摘??要：對超細粉煤灰摻量為0～30%之間的混凝土抗壓強度、硬化漿體水化產物中化學結合水和Ca(OH)2量的變化情況進行了分析。結果表明，超細粉煤灰摻入后能夠充分發揮填充效應和火山灰活性，消耗水泥水化產物中的Ca(OH)2，降低水化產物中Ca(OH)2含量，且隨水化齡期的延長，參與水化程度提高，能夠提高混凝土的后期強度。Abstract:Thecompressivestrengthofconcretewith0～30%ultrafineflyash,chemicallycombinedwaterandCa(OH)2ofhardenedpasteswereanalyzed.Theresultsshowthatbecauseofthefillingeffectandvolcanicactivity,theultrafineflyashcanconsumeCa(OH)2ofhydrationproducts,soCa(OH)2isdecreased,meanwhilethelaterstrengthofconcreteisincreased.

清水混凝土制備技術研究

王龍志1，路林海2，崔鑫1，郭偉3，王桂玲4

２０16年第12期

摘要

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摘??要：清水混凝土以其節約工程成本、提高工程質量、改善企業管理水平等優點，自20世紀90年代后期以來在技術研究及工程應用方面得到了長足發展。但對清水混凝土的研究主要集中在施工技術方面，而工程應用中清水混凝土的配合比設計方法使用普通混凝土配合比設計方法、高性能混凝土配合比設計方法，沒有建立起針對清水混凝土的專用配合比設計方法。為此，以軌道交通清水混凝土工程為依托，開展了清水混凝土專用配合比設計方法的研究。通過對清水混凝土專用配合比設計方法所設計的清水混凝土工作性能、力學性能、耐久性能、表觀質量等方面的研究表明，清水混凝土專用配合比設計方法設計的清水混凝土各項性能指標符合工程設計及相關標準要求。Abstract:Withitssavingprojectcost,improvingthequalityofengineering,improvingenterprisemanagementlevel,etc,thefair-facedconcretegotrapiddevelopmentinthetechnologyresearchandengineeringapplicationsincethelate1990s.However,theresearchoffair-facedconcretemainlyconcentratedintheconstructiontechnology,andmixturedesignmethodoffair-facedconcreteusethemixturedesignmethodofordinaryconcreteandhighperformanceconcreteduringengineeringapplication,thereisnoestablishedspecialmixturedesignmethodforfair-facedconcrete.Therefore,withtherailtransportfair-facedconcreteprojectasthebackground,theresearchofthespecialmixturedesignoffair-facedconcreteiscarriedout.Thestudyonworkingproperties,mechanicalproperties,durabilitypropertiesandapparentqualityoffair-facedconcreteshowsthatthevariousperformanceindicatorsoffair-facedconcretedesignedbythespecialmixturedesigncanmeettherequirementsofengineeringdesignandrelatedstandards.

采用CFRP增強PHC管樁截樁端部抗剪承載力的研究

郭昭勝，白曉紅，賀武斌

２０16年第12期

摘要

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摘??要：分析了工程截樁現象對管樁截樁端部截面抗剪承載力的影響，提出了在截樁端部圍裹粘貼CFRP的增強措施，分析了受圍裹約束的管樁混凝土強度的提高機理，給出了適用于工程的抗剪承載力計算公式，并結合常用樁型試算驗證了截樁端部抗剪承載力的提高效果。結果表明，對于幾種常用規格的PHC管樁，當剪跨比介于1.0～3.0之間時，截樁造成截樁端部抗剪承載力的損失率約在25%～37%之間，應采取專門加固措施，而采用單層CFRP圍裹加固后的截樁端部抗剪承載力提高幅度可達到43.4%～100%，加固效果良好。Abstract:Theeffectofthelossofcuttingpileontheshearcapacityofcuttingpileendsectionisdiscussed.AstrengtheningmeasurethattheendofcuttingPHCpilewrappedbyCFRPisputforwardandtheimprovemechanismofthepileendisanalyzed.Theformulationofbearingcapacitycalculationisproposed,andtheimproveeffectofshearbearingcapacityofthepileendisverified.TheresultsshowthatforseveralcommonlyspecificationsofPHCpile,whenis1.0～3.0,thelossofshearbearingcapacityduetocuttingpileisabout25%～37%,sothepileendshouldtakethestrengthenmeasure.However,theshearbearingcapacityofthepileendiswrappedbythesinglelayerCFRPcanbeincrease43.4%～100%.

橋面連接板修補用高延性水泥基復合材料的設計與應用

郭麗萍1，朱春東2，范永根2，陳波3，諶正凱1

２０16年第12期

摘要

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摘??要：采用國產聚乙烯醇纖維及天然河砂，設計制備了滿足橋面連接板修補應用的高延性水泥基復合材料（HDCC），并對其工作性能、力學性能、彎曲韌性、延性和早期抗裂性能進行了試驗研究。結果表明，HDCC拌合物的擴展度為190mm，28d抗折與抗壓強度分別為15.5MPa和54.4MPa，彎曲跨中最大撓度10mm，極限延伸率為2.5%，對早齡期抗裂改善率為100%。并將所制備的HDCC應用在某橋面連接板修補工程中，取樣測試結果表明，施工現場制備的HDCC滿足設計要求，使用效果良好。Abstract:Thedomesticpolyvinylalcoholfiberandnaturalriversandwereusedtopreparehighductilitycementitiouscomposite(HDCC)forbridgedecklinkslabrepairing.Workability,mechanicalproperties,bendingtoughness,ductilityandearlyagecrackingresistancepropertiesoftheHDCCweretested.Theresultsshowthattheslumpflowis190mm.Atageof28days,flexuralstrengthandcompressivestrengthare15.5MPaand54.4MPa,respectively.Themaximumbendingdeflectionis10mmandultimateelongationis2.5%.Theearlyagecrackingimprovementrateis100%.TheapplicationofHDCCintherepairofonebridgedecklinkslabwascarriedout.Thetestresultsofin-situsamplingshowthattheHDCCmeetsthedesignrequirementsandtheapplicationeffectsaresatisfied.

節能降耗新型預制鋼筋混凝土溝蓋板技術

蔣小俊，李強林

２０16年第12期

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摘要：針對傳統混凝土溝蓋板的不足，優化設計了新型節能環保型預制鋼筋混凝土溝蓋板。填漿縫的制作更好地保證了產品的質量、縮短了安裝工期；將吊環結構改成側面吊孔結構，有效節約了材料和人工；去掉了主鋼筋端部的彎勾結構，通過骨架焊接、提高混凝土強度，保證了混凝土對鋼筋的握裹力，彌補了彎勾筋所起的作用；在保證蓋板長度、厚度不變的前提下，將寬度加大，大大提高了生產效率，節約了生產造價；疊加式生產工藝可以節約場地并減少吊裝或搬運的工作量，便于形成規?；a，從而提高了經濟效益。 Abstract: Aiming at the shortcomings of the traditional concrete trench cover, the new energy-saving environmental protection precast reinforced concrete ditch cover plateis are designed and optimizated. The filling slurry seam is added to better ensure the quality of the product and shorten the installation time limit.The suspension loop structure is changed to the lateral hanging hole structure to save materials and labour. Removing the curved hook structure of main reinforcement and welding frame as well as improving the strength of concrete to effectively guarantee the bond stress of reinforcement bar for concrete to make up for the role of the curved hook. In the premise of guarantee the length and thickness of trench cover unchanged, the width of trench cover is increased to greatly improve the production efficiency and save production cost.Superposition type production process can save space and reduce the workload of lifting or handling to improve the economic benefit.

PVA纖維改性磷酸鹽水泥材料的研究

孫晨，丁鑄

２０16年第12期

摘要

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摘要：為了探究PVA纖維對磷酸鎂水泥性能的影響，制備了不同摻量PVA纖維復合MPC，測試其抗壓、抗折強度、彎曲性能，并用X射線三維重構顯微鏡（XCT）分析了微觀結構。研究結果表明，PVA纖維的加入對磷酸鎂水泥抗折性能有顯著的提高，但是對抗壓強度影響不大；PVA纖維的加入對于彎曲性能有較好的改善，延性顯著提高，顯示出明顯的彎曲硬化特點，可以有效改善磷酸鎂水泥的脆性破壞特征。微觀分析發現，PVA纖維在基體中成均勻亂向分散，有利于阻止裂縫的發展。 Abstract: In order to study the effects of PVA fiber on properties of MPC, composite MPC with different dosage of PVA fiber was prepared to test the compressive strength, flexural strength, flexural properties, and the microstructure was analyzed by using XCT. The results showed that the addition of PVA fiber has a significant improvement on the flexural strength of MPC, but it has little effect on the strength of resistance. The addition of PVA fiber has a good improvement in flexural properties, and the ductility is significantly improved, which shows obvious bending hardening characteristics and can effectively improve the brittle failure characteristics of MPC. The microscopic analysis show that the PVA fiber is evenly distributed in uniform chaos, which can prevent the development of cracks.

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