第二期_2016_《混凝土與水泥制品》雜志社

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第二期

鋼纖維再生混凝土彎曲疲勞性能研究

秦道天

２０16年第2期

摘要

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摘要：對普通混凝土（NC）、再生混凝土（RAC）、鋼纖維混凝土（SFRC）和鋼纖維再生混凝土（SFRRAC）的彎曲疲勞性能進行了試驗研究。分析了應力水平、再生骨料和鋼纖維對混凝土彎曲疲勞壽命和離散性的影響規律。在試驗研究的基礎上，應用疲勞壽命統計學理論擬合了各組混凝土材料彎曲疲勞壽命的兩參數威布爾分布,并建立了相應的單對數和雙對數彎曲疲勞方程。結果表明，再生混凝土的疲勞壽命明顯低于天然骨料混凝土，離散性也更大；鋼纖維可以顯著提高混凝土的疲勞壽命，并降低離散性。各組混凝土材料的彎曲疲勞壽命很好地服從兩參數的威布爾分布；建立的單對數和雙對數彎曲疲勞方程與試驗實測數據吻合良好。 Abstract: The experimental research on the flexural fatigue properties of normal concrete (NC), recycled aggregate concrete (RAC), steel fiber reinforced concrete (SFRC) and steel fiber reinforced recycled aggregate concrete (SFRRAC) is carried out. The influence rules of stress level, recycled aggregate and steel fiber on fatigue life and discreteness are analyzed. Based on the experimental studies, two-parameter Weibull distribution of flexural fatigue life of concrete is derived by using statistics theory, and the corresponding single logarithmic and double logarithmic equations are gained. The experiment results show that flexural fatigue life of recycled aggregate concrete is obviously lower than that of natural aggregate concrete, and the discreteness is greater; steel fiber can significantly improve the flexural fatigue life of concrete and decrease the discreteness. The flexural fatigue life of concrete materials follows two-parameter Weibull distribution; experimental single logarithmic and double logarithmic equations can describe the experimental test data well.

磷渣-粉煤灰復合輔助性膠凝材料性能研究

廖建勛，李軍，盧忠遠

２０16年第2期

摘要

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摘??要：以磷渣-粉煤灰復合輔助性膠凝材料為對象，研究了不同磷渣摻量對低等級粉煤灰的需水量比、活性指數以及與減水劑適應性的影響，并利用XRD，SEM，TG等測試手段探究磷渣-粉煤灰-水泥體系的相互作用機理。結果表明，磷渣的摻入有助于降低粉煤灰需水量比、提高粉煤灰的活性指數，改善與外加劑的適應性，磷渣-粉煤灰-水泥體系的水化產物主要包含Ca（OH）2、AFt、CaCO3、C-S-H凝膠。Abstract:Takingthephosphorusslag-flyashcompositeauxiliarycementitiousmaterialsasanobject,theinfluencesofdifferentphosphorusslagcontentonwaterdemandratio,activityindexoflowgrandflyashandthecompatibilityofsuperplasticizerarestudied,besides,theinteractionmechanismofphosphorusslag-flyash-cementcompositebindingmaterialsisdiscussedbyusingXRD，SEM，TG.Theresultsshowthat,addingphosphorusslagcandecreasethewaterdemandratioofflyashwhichcanincreaseactivityindexofflyash,andimprovethecompatibilityofsuperplasticizer.Hydrationproductsofphosphorusslag-flyash-cementcompositebindingmaterialsmainlyincludeCa(OH)2、AFt、CaCO3andC-S-Hgel.

白浪河大橋異型斜腿混凝土施工技術分析與研究

余沛1，李多2，孫旭平3，王安輝1

２０16年第2期

摘要

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摘要：結合白浪河大橋及摩天輪工程的斜腿施工工程實例，從施工工藝及BIM軟件模擬方面，運用理論與實踐相結合的施工方法及項目管理理念，對白浪河大橋及摩天輪工程的斜腿施工工藝進行了論述，并總結了橋輪合一的情況下大型異形混凝土分層澆筑的施工方法。 Abstract: Combination with legs construction engineering project for Bailang river bridge and Ferris wheel project, from construction technology to BIM software simulation, construction method and project management concepts are used with theory and practice, legs construction technology for Bailang river bridge and Ferris wheel project is discussed, construction method of large special-shape layered pouring is summarized under the situation of bridge-round.

PVA-ECC材料在橋梁伸縮縫工程中的應用

劉曙光1,2,常智慧1, 張棟翔1, 張國才3, 柴寅博3

２０16年第2期

摘要

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摘要：為提高橋梁伸縮縫的使用壽命，解決伸縮縫破損快速修復的問題，提出了一種高延性纖維增強水泥基復合材料(PVA-ECC)。室內試驗結果表明，PVA-ECC具有良好的抗彎性能、抗拉性能、抗滲性能、抗凍性能，對伸縮縫常見病害有良好的預防及修復效果且施工簡便，養護時間短。 Abstract: In order to improve the service life of bridge expansion joints and solve the problem of rapid repairing for damage of expansion joints, a high ductility fiber reinforced cementitious composites (PVA-ECC) is proposed. Laboratory test results show that, PVA-ECC has good flexural performance, tensile properties, permeability resistance, frost resistance performance, which has good prevention and repairing effect for common disease of expansion joints, PVA-ECC is easy to construct and maintenance time is short.

泡沫混凝土抗壓強度和導熱系數的實驗研究

習會峰1，劉逸平2，馬宏偉1，羅紹鴻3，王志剛3，黃芹3

２０16年第2期

摘要

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摘要：研究了輕質泡沫混凝土在不同密度下的抗壓強度和導熱性能。結果表明，抗壓強度和導熱系數均隨著干密度的增大而增大；建立了抗壓強度和導熱系數與干密度的非線性本構關系，可為泡沫混凝土用于建筑保溫系統提供理論參考。 Abstract: The compressive strength and thermal conductivity of lightweight foam concrete under different density is studied. The results show that, compressive strength and thermal conductivity are increased with the increasing of dry density; nonlinear constitutive relation for dry density with compressive strength and thermal conductivity are established, which can provide a theoretical reference to foamed concrete for building insulation system.

預制構件用鋼鐵渣粉混凝土配合比試驗研究

林茂松1，潘平2，余曉紅2，朱永明3

２０16年第2期

摘要

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摘??要：通過正交試驗，研究了膠凝材料用量、鋼鐵渣粉摻量、外加劑摻量和砂率對混凝土性能的影響。結果表明，鋼鐵渣粉的摻入會延長混凝土凝結時間和降低早期強度，但對后期強度影響不大，可通過適當提高膠凝材料用量、外加劑摻量和砂率進行優化，當膠凝材料用量為340kg/m3、370kg/m3，鋼鐵渣粉摻量為20%，外加劑摻量為0.6%，砂率為40%時，混凝土工作性能和力學性能均滿足PC構件生產要求，可為預制構件中鋼鐵渣粉的大規模推廣應用提供技術支撐。Abstract:Throughorthogonalexperiments,theinfluenceofcementitiouscontent,steelslagpowderdosage,admixturecontentandsandratioonpropertiesofconcreteisstudied.Theresultsshowthat,addingsteelslagpowdercanextendthesettingtimeofconcreteanddecreaseearlystrengthofconcrete,whichhaslittleinfluenceonlatestrengthofconcrete,theoptimizationiscarriedoutbyincreasingamountofcementitiousmaterials,admixturedosageandsandrate,whenamountofthecementitiousmaterialsis340kg/m3and370kg/m3,thedosageofsteelslagpowderis20%,thedosageofadmixtureis0.6%,andsandratiois40%,theworkabilityandmechanical?performanceofconcretecanmeettheproductionrequirementofprefabricateconcrete,whichcanprovidetechnicalsupportforlarge-scaleapplicationofsteelslagpowderinprefabricatedcomponents.

蒸壓加氣混凝土砌塊自保溫墻體專用砌筑砂漿中鋼筋埋置長度的試驗研究

陳萌，趙湘育，馬婷婷，張豪劍，劉樂慶

２０16年第2期

摘要

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摘要：通過九組試件36根鋼筋在蒸壓加氣混凝土砌塊自保溫墻體專用砌筑砂漿中的拉拔試驗，分析了豎向正應力、砂漿強度等級和鋼筋錨固長度等因素對拉結鋼筋黏結錨固性能的影響；通過三組試件6根鋼筋的拉拔試驗，得出鋼筋內力和黏結應力沿錨固長度的分布曲線；計算錨固破壞時沿錨固長度變化的平均黏結應力，分別給出鋼筋在自保溫墻體砌塊專用砂漿強度等級Mb5和Mb10中的臨界錨固長度；為便于工程應用，提出了滿足可靠度要求的鋼筋建議埋置長度。 Abstract: Through the pullout tests of nine group specimens for 36 steel reinforced in autoclaved aerated concrete blocks self-thermal insulation wall, the influence of vertical normal stress, mortar strength grade and steel bar anchorage length on bond-anchorage property of binding steel bar is analyzed; through the pullout tests of three group specimens for 6 steel reinforced, the distribution curves of steel forces and bond stresses along anchorage length are obtained; the average bond stresses along anchorage length are calculated at bond-anchorage failure, and the critical anchorage lengths of steel bar embedded in Mb5 and Mb10 are given. For engineering application, the design anchorage lengths to satisfy reliability requirement are proposed.

預制混凝土疊合板鋼筋黏結性能的研究

侯和濤，陳磊，程佑東，朱文燦

２０16年第2期

摘要

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摘要：通過鋼筋的拉拔試驗研究了預制混凝土疊合板內鋼筋的黏結性能。設計30個預制板與后澆混凝土的疊合板試件，主要研究混凝土強度、鋼筋錨固長度、鋼筋位置、鋼筋直徑四個因素對黏結性能的影響。并設計12個混凝土現澆試件作為對比，以研究兩種試件鋼筋與混凝土黏結強度的差異。試驗結果表明：疊合試件發生剝離破壞和劈裂-剝離破壞，現澆試件均發生劈裂破壞；疊合試件內鋼筋的黏結強度隨鋼筋直徑和錨固長度的減小、混凝土強度和鋼筋至預制板距離的增大而增大，并且明顯小于現澆試件中鋼筋的黏結強度。根據試驗結果，統計回歸出預制混凝土疊合板鋼筋的極限黏結強度計算公式，并由此推出鋼筋錨固長度的計算公式以指導工程應用。 Abstract: This paper investigates the bond behavior of steel bars in precast concrete composite slabs through pull-out tests. A total of 30 specimens representing steel rebars embedded in precast concrete composite slabs were prepared for evaluating the influences of concrete strength, anchorage length, embedded location and rebar diameter on bonding strength of the rebars. For comparison purpose, another 12 specimens of the steel rebars embedded in cast-in-place concrete were also tested. Test results show that the rebars embedded in precast concrete composite slabs either exhibit debonding failures or cause splitting failures in the surrounding concrete while the rebars embedded in cast-in-place concrete consistently failed due to splitting failures of the concrete. Additionally, it is found that bonding strength of the rebars embedded in precast concrete composite slabs increases when the rebar diameter and anchorage length reduce. Moreover, bonding strength of the rebars embedded in precast concrete composite slabs tends to be higher when concrete strength is higher and the distance between steel rebars and precast panels becomes larger. Further, test results reveal that bonding strength of the rebars embedded in precast concrete composite slabs is remarkably lower than that of the rebars embedded in cast-in-place concrete. Based upon regression analysis of the test data, an analytical model was proposed for calculating bonding strength of the rebars embedded in precast concrete composite slabs. The model can be used to determine the required anchorage length of the rebars embedded in cast-in-place concrete in design.

國產PVA纖維用于高韌性纖維增強水泥基復合材料的試驗研究

彭明強1，李國友2，范磊 1，李銳1，王明銘1

２０16年第2期

摘要

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摘要：采用正交試驗設計方法，以國產聚乙烯醇（PVA）纖維作為增強纖維，研究了水膠比、粉煤灰摻量和膠砂比對高韌性纖維增強水泥基復合材料單軸拉伸性能的影響。研究結果表明：在較大水灰比和粉煤灰摻量達到70%的情況下，選用國產PVA纖維，仍然可以配制出成本低/單軸拉伸應力應變達到1%，且具有多微裂縫開裂特征的高韌性纖維增強水泥基復合材料。 Abstract: Through design method of orthogonal experiment, domestic polyvinyl alcohol(PVA) fiber as reinforce fiber, the influence of water-binder ratio, content of fly ash and cement aggregate ratio on uniaxial tension of high toughness fiber cementitious composites is studied.The results show that, under the situation of high water-binder ratio and 70% dosage of fly ash, low cost and 1% uniaxial tension stress can be prepared by domestic PVA fiber, and high toughness fiber cementitious composites have characteristic of more micro-cracks.

磁化水鋼纖維混凝土抗折性能試驗與分析

費厚乾，馬芹永

２０16年第2期

摘要

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摘要：為改善混凝土脆性、易開裂缺點，提高纖維與混凝土的黏結強度，同時提高混凝土強度，綜合考慮三者的基礎上，采取在混凝土中摻入鋼纖維，并使用磁化水代替普通水，制備磁化水鋼纖維混凝土，進行三種水流速度和四種鋼纖維體積率條件下的抗折強度試驗。試驗結果表明，對于普通水和磁化水鋼纖維混凝土，抗折強度均隨鋼纖維摻量的增加而增大；磁化水能有效提高鋼纖維混凝土的抗折強度；當鋼纖維體積率為1.8%，水流速度為2.1m/s時抗折強度提高幅度較大，增長率為27.38%。 Abstract: In order to improve the shortage for brittleness of concrete and easy to crack, the bonding strength of the fiber and concrete is enhance, at the same time, strength of concrete is improved, considering these three factors, magnetized water steel fiber reinforced concrete is prepared by adding steel fiber in concrete, using magnetized water instead of ordinary water. Flexural strength experiments for three kinds of flow velocities and four kinds of steel fiber volume rate are carried out. The results show that, as ordinary water and magnetized water steel fiber reinforced concrete, flexural strength is increased with the increasing steel fiber content; magnetized water can effectively enhance flexural strength of steel fiber reinforced concrete; when the steel fiber volume is 1.8%, the flow velocity is 2.1m/s, flexural strength increased by a big margin, growth rate is 27.38%.

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