2018_2018_《混凝土與水泥制品》雜志社

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2018

型鋼混凝土疊合梁底部預制構件變形和裂縫計算

康建飛1，邵永健1，姚大坤1，郭敬超1，易樂平2

２０18年第8期

摘要

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摘要：為了計算型鋼混凝土疊合梁施工階段的開裂彎矩、變形和裂縫寬度，完成了6根型鋼混凝土疊合梁底部預制構件的靜力試驗，在試驗的基礎上重點分析了開裂彎矩、剛度和裂縫寬度公式，并通過參考相關文獻，得出計算公式。計算結果表明，用本文公式計算得到的理論值與試驗值吻合良好。 Abstract: In order to calculate the cracking moment, deformations and the crack width during the construction phase of the steel reinforced concrete composite beam, static tests are carried out on the bottom prefabricated components of six steel reinforced concrete composite beams. On the basis of the tests, the cracking moment, stiffness and crack width formulas are mainly analyzed. By referring to relevant literature, the formulas are obtained. The results show that the theoretical value calculated by the formulas in this paper are in good agreement with the experimental ones.

鋼管混凝土梁承載力優化分析

劉暢，王成，喻永生

２０18年第8期

摘要

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摘要：鋼管混凝土梁承載力優化問題一直是工程界比較關心的問題，通過引入強重比的概念，對比分析了鋼筋混凝土梁構件和鋼管混凝土梁構件的強重比。分析結果表明，強重比越大，構件的承載力和性能就越好。同時利用有限元軟件ABAQUS對其承載力進行參數優化分析，通過參數優化分析進一步提高鋼管混凝土梁的承載力，以滿足實際工程的需要。 Abstract: The optimization of bearing capacity of concrete-filled steel tubular beams has always been concern of the engineering community. The strong weight ratio of the reinforced concrete beams and concrete filled steel tubular beams are comparative analyzed. The results show that the bearing capacity of the beams is increasing with strong weight ratio, and the finite element software ABAQUS is used to analyze the parameter of bearing capacity. Through the parameter optimization analysis, the bearing capacity of the concrete-filled steel tubular beam is further improved to meet the needs of actual engineering.

PKG預制底板的截面優化設計、生產與施工研究

楊麗1，2，陶忠2，4，羅榮1，2，錢帆1，2，陳進3

２０18年第8期

摘要

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摘要：PKG預制底板是直接在2.4~6.0 m跨PK預應力混凝土預制底板的混凝土肋上外包內卷邊C型槽鋼所得，其特點是工業化預制程度高，預制過程支模簡單、有利于成品保護，預制底板及其疊合后的疊合樓板剛度大。由于PK預制底板受力性能均已滿足規范要求，外包型鋼后，其力學性能有很大富余度。本文研究了PKG板的截面參數，并編制了僅輸入板跨和板寬即可進行PKG板迭代設計計算的MATLAB程序，對2.4~6 m跨PKG預制底板考慮最小用鋼量時的肋高、預應力鋼筋數目等進行了截面優化和規整化設計，利用程序迭代設計計算了6.3~9 m跨的PKG預制底板，最終設計出了截面合理、力學性能優異的既滿足規范要求又適合于工業化生產的PKG預制底板；并對PKG疊合樓板的工業化生產與施工進行了介紹，可為PKG預制底板的設計及疊合板的生產、施工提供參考。 Abstract: The PKG precast baseplate is directly to outsource inner edge C channel steel on concrete ribs of the PK prestressed concrete precast baseplate within the span of 2.4~6.0 m, which has such advantage as high degree of industrialized precast, formwork rectification of prefabricated process is simple, and it is advantageous to the finished product protection, stiffness of precast baseplate and composite slab is big. Since the performance of the PK precast baseplate has contented the requirements of the specification, the mechanical properties of the outsourced section steel have a great degree of redundancy. The section parameter of the PKG slab is studied, and the MATLAB program that can be done iterative design and calculation of the PKG slab only inputing span and width of slab has been designed, the costal height, the number of prestressed reinforcement bars and so on of the PKG precast baseplate that has considered the minimum amount of steel have been carried the section optimization and regularization design within the span of 2.4~6.0 m, and the iterative design program was used to calculate the PKG precast baseplate within the span of 6.3~9 m. Finally, the PKG precast baseplate with reasonable section, excellent mechanical properties, contenting the specification requirements and suitable for its industrialized production was designed, and the industrial production and construction of PKG composite slab are briefly introduced, which can provide a reference for the design of the PKG precast baseplate and production construction of the PKG composite slab.

橡膠粉再生混凝土路用性能試驗研究

杜婷1，張斌偉1，郭志堅2

２０18年第8期

摘要

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摘要：在粗骨料（廢棄混凝土）取代率為100%的再生混凝土中分別摻加2%、5%和8%的20目、40目和60目橡膠粉，按照相同的水灰比、砂率、強度等級配制了129個膠粉再生混凝土試件進行室內試驗。結果表明，抗壓強度隨橡膠粉摻量的增加及粒徑的減小而降低，抗折強度先增加后降低，而抗沖擊韌性和抗凍性得到顯著改善；再生混凝土中摻加5%的40目橡膠粉其路用性能最優。 Abstract: 2%,5% and 8% of rubber powder with 20mesh,40mesh and 60mesh are respectively added to the recycled concrete with 100% replacement of coarse aggregate，129 recycled concrete specimens are prepared for laboratory tests by the same water-cement ratio, sand rate and strength grade. The results show that the compressive strength decreases with the increase of mixed quantity and the decrease of the particle size rubber powder. The flexural strength increases first and then decreases, and the impact toughness and freezing resistance are improved significantly. The recycled aggregate concrete can reach the best pavement performance when mixed with 40 mesh, 5% rubber powder by comprehensive consideration.

長徑比對SFRC抗壓性能的細觀數值模擬

徐佳宇，劉筱玲，杜義祥，姚勇

２０18年第8期

摘要

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摘要：根據Weibull統計分布理論推導了鋼纖維混凝土（SFRC）的損傷本構模型，基于試驗數據得到了SFRC模型參數。利用ANSYS軟件在細觀上建立鋼纖維混凝土立方體試件有限元模型，并對其單軸壓受力下的力學性能和破壞狀態進行了數值模擬，研究鋼纖維長徑比對鋼纖維混凝土抗壓強度的影響。結果表明，SFRC細觀模型能較好的模擬單軸受壓下混凝土的靜力學性能和損傷破壞。 Abstract: According to Weibull Statistical Distribution Theory, the damage constitutive model of SFRC is derived, and the SFRC model parameters are obtained based on the test data. The finite element model of steel fiber reinforced concrete cube specimen is established by using ANSYS. The mechanical properties and failure state under uniaxial compression stress are numerically simulated to study the effect of aspect ratio of steel fiber on the compressive strength of steel fiber reinforced concrete. The results show that the meso mechanical model of steel fiber reinforced concrete can simulate the static and damage properties of concrete under uniaxial compression.

機制砂物理特性對高強混凝土工作性能和強度的影響[J].混凝土與水泥制品

李振懷，甘洋宇，管民生，杜宏彪

２０18年第8期

摘要

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摘要：以原料形態為石灰石和卵石的兩種機制砂作細骨料，通過配合比設計，研制出了 C60、C80、C100 機制砂高強混凝土,研究了機制砂原料形態以及不同石粉含量（3%、5%、7%、10%）對高強機制砂混凝土工作性能和抗壓強度的影響。結果表明，機制砂原料形態對高強機制砂混凝土工作性能和抗壓強度影響較為顯著；石粉含量對高強機制砂混凝土工作性能影響較大，對強度影響較??；石粉含量小于等于7%時，兩種原料形態的高強機制砂混凝土均具有良好的工作性能與力學性能，滿足結構設計要求，研究結果可為工程實際應用提供參考。 Abstract: The high-strength manufactured sand concrete with strength grades of C60, C80 and C100 are prepared by using concrete mix design methods. Two forms of raw materials,i.e., pebbles and limestone are adopted. Further, the effect of two key factors associated with raw materials of manufactured sands and contents（3%，5%，7%，10%）of stone powder on workability as well as compressive strength of manufactured sand concrete is investigated. The results show that the raw materials of manufactured sands have significant effects on the workability and compressive strength of high-strength concrete. The contents of stone powder have strong effect on the working performance of high-strength manufactured sand concrete, while small effects on its compressive strength. When the content of stone powder is less than or equal to 7%, the high-strength manufactured sand concrete with two kinds of raw materials has good workability and mechanical properties, and can meet the requirements of structural design. The results can provide reference for practical use.

石墨碳纖維導電混凝土制備及接地特性研究

劉宇彬1，陳霖華1，徐志強1，李興澤1，馮新軍2

２０18年第8期

摘要

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摘要：選取碳纖維、石墨為導電相材料制備用于接地工程的導電混凝土，對石墨碳纖維導電混凝土的拌合工藝、配合比和接地特性進行了試驗研究。結果表明，當碳纖維摻量0.6%、石墨摻量2%、單位用水量240 kg、砂率32%并采用半干拌法拌合工藝時，導電混凝土具有良好的導電性能和力學性能; 混凝土電阻率隨齡期增長趨于穩定，穩定值為1.62 Ω·m 左右，電阻率在-10～60 ℃范圍內的變化幅度小于0.52 Ω·m，隨環境濕度變化電阻率的變化幅度小于0.28 Ω·m，導電性能穩定; 導電混凝土28 d 抗壓強度達到37.3 MPa，抗折強度達到5.0 MPa，滿足接地材料的力學性能要求。 Abstract: Carbon fiber and graphite are selected as conductive phase materials to prepare conductive concrete for grounding engineering. The mixing process, mix proportion and grounding characteristics of graphite-carbon fiber conductive concrete are experimentally studied. The results show that, when the carbon fiber content is 0.6%, the graphite content is 2%, the unit water use is 240 kg, the sand rate is 32%, and the semi-dry mixing method is adopted, the conductive concrete has good electrical conductivity and mechanical properties. The resistivity of concrete tends to be stable along with the age growth and the stable value is 1.62 Ω·m. The rangeability is less than 0.52 Ω·m when resistivity is between -10 ℃ and 60 ℃. The resistivity variation with environmental humidity change is less than 0.28 Ω·m, and the conductive performance is stable. The compressive strength of 28 d can reach 37.3 MPa and the bending strength of 28 d reaches 5.0 MPa, that can meet the requirement of mechanical properties of the grounding materials．

水泥穩定建筑垃圾骨料配合比研究[J].混凝土與水泥制品

方濤1，文華1，劉穎2，李曉靜1

２０18年第8期

摘要

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摘要：為了研究廢棄混凝土與廢棄磚塊再生骨料在輕交通量公路基層中應用的水泥穩定建筑垃圾骨料配合比方案，通過試驗初步確定合乎規范的各材料配比，并開展了擊實試驗、7 d無側限抗壓強度試驗，分析其力學性能，確定最終配合比方案。研究結果表明，在輕交通量公路基層中，建筑垃圾再生骨料的應用是可行的；得出了建筑垃圾再生骨料在公路基層中的配合比；建筑垃圾再生骨料最佳含水量為9.8%~18.4%，最大干密度為1.537~2.050 g/cm3，得到了建筑垃圾骨料在輕交通量公路基層中應用達到強度要求的配合比。 Abstract: In order to study the mixture ratio scheme of waste concrete and waste brick recycled aggregate in light traffic highway base, the proportions of the various materials are preliminarily determined through experiments, and compaction test and 7 d unconfined compressive strength test are carried out. The mechanical properties are analyzed, and the final mix proportion plan is determined. The results show that application of recycled aggregate construction waste is feasible in the light of traffic volume of highway base. Construction waste recycled aggregate with in base of highway is obtained. The optimum moisture content of recycled aggregate is 9.8%~18.4%, the maximum dry density is 1.537~2.050 g/ cm3. The mix ratio of building garbage collection in light traffic road base is obtained.

鋼纖維粉煤灰混凝土抗硫酸鹽侵蝕特性研究

王慧

２０18年第8期

摘要

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摘要：通過試驗對硫酸鹽侵蝕循環作用下鋼纖維粉煤灰混凝土的抗壓強度、抗拉強度和抗折強度進行了研究，分析了鋼纖維體積率、粉煤灰摻量和硫酸鹽濃度對混凝土強度的影響規律。結果表明，鋼纖維粉煤灰混凝土抗壓強度隨著硫酸鹽濃度的增加呈現出了先增大后減小的變化規律，而抗壓強度和抗折強度均呈現出了加速減小的趨勢；適量摻加的鋼纖維和粉煤灰能夠有效提高粉煤灰混凝土的強度和抗硫酸鹽腐蝕能力，理想的摻量比例為鋼纖維體積率1.0%，粉煤灰摻量30%。 Abstract: Compressive strength, tensile strength and flexural strength of steel fiber fly ash concrete under the action of the sulfate erosion cycle are studied through indoor test method. The influence laws of concrete strength with the steel fiber volume ratio, dosage of fly ash and sulfate concentration are analyzed. The results show that the steel fiber concrete compressive strength of fly ash increases first then decreases with the increase of sulfate concentration, while the compressive strength and flexural strength present a decrease trend. The strength and sulfate corrosion resistance of fly ash concrete can be improved effectively by adding a proper amount of steel fiber and fly ash. The ideal dosage proportion is steel fiber volume rate 1.0%, fly ash content 30%.

堿礦渣再生骨料混凝土堿骨料反應研究

宋進平，徐清，馬倩敏，劉李斌，寧于

２０18年第8期

摘要

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摘要：選用不同類型的骨料配制原生混凝土，自行加工破碎成再生骨料，采用快速砂漿棒法研究了不同類型再生骨料的堿活性，并試驗研究了再生骨料來源、堿濃度以及水玻璃模數對堿礦渣再生骨料砂漿堿骨料反應膨脹率的影響。結果表明，以火山凝灰巖、火山角礫巖為骨料配制的原生混凝土加工而成的再生骨料可能存在潛在堿骨料反應危害。提高水玻璃模數以及堿濃度會導致堿礦渣再生骨料砂漿堿骨料反應膨脹率的增大。 Abstract: Different types of aggregate are used to prepare concrete and crushed into recycled aggregate. The alkali activity of different types of recycled aggregate is studied by using rapid- mortar bar method. And the effect of the source of recycled aggregate, the concentration of alkali and the modulus of sodium silicate on the alkali-aggregate reaction expansion rate of alkali aggregate mortar with alkali slag regenerated aggregate mortar are studied. The result shows that regenerated aggregates from concrete prepared from volcanic tuff and volcanic breccia may have potential alkali-aggregate reaction hazards. The increase of sodium silicate modulus and alkali concentration will lead to the increase of alkali-aggregate reaction expansion rate of alkali slag regenerated aggregate mortar.

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