第三期_2017_《混凝土與水泥制品》雜志社

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第三期

高溫環境下超長流淌距離自密實混凝土的研究及應用

馬瑞杰1，山穎獲1，李春軒1，耿剛強2，李存陽1

２０17年第3期

摘要

引用本文

摘要：通過調整膠凝材料用量、摻入復合礦物摻合料、高效減水劑、膨脹劑、保水劑等試驗，優化配合比，研發出適應于高溫環境具有超長流淌距離的自密實混凝土，成功應用于西安繞城高速加固項目，不僅滿足澆注的技術要求，還大大加快了施工進度，確保了工程質量，具有較好的社會和經濟效益。 Abstract: By adjusting the dosage of gelled material, mixed with composite mineral admixtures, high efficiency water reducing agent, expansive agent, water retention agent test, optimizing the mixture ratio, the self-compacting concrete adapted to the environment of high temperature and with long distance flowing is prepared. And it is successfully applied for the Xian city high-speed reinforcement project, which can not only satisfy the requirements of the casting, but also greatly speed up the construction progress, ensure the engineering quality, and have good social and economic benefits.

馬瑞杰,山穎獲,李春軒,等.高溫環境下超長流淌距離自密實混凝土的研究及應用[J].混凝土與水泥制品,2017(3):1-4. MA R J, SHAN Y H, LI C X,et al.Research and Application of Self-compacting Concrete with Super Long Distance Flowing under High Temperature Environment[J].China Concrete and Cement Products,2017(3):1-4.

粗骨料對自密實混凝土流變性能影響的研究

蔣玉川，王陽，許金娥

２０17年第3期

摘要

引用本文

摘??要：研究了粗骨料間距系數對自密實混凝土流變性能的影響。試驗結果表明，在粗骨料最大粒徑為16mm、砂子與砂漿體積比為0.43、水膠比為0.38情況下，粗骨料間距系數對自密實混凝土拌合物坍落擴展度和V型漏斗流出時間有顯著影響。粗骨料間距系數越大，坍落擴展度越大，V型漏斗流出時間越小。本文試驗條件下，自密實混凝土粗骨料間距系數取值范圍為1.31～1.58較為合適，既可以保證拌合物具有優良的流變性能，又可以保證混凝土的穩定性。本文試驗中，粗骨料間距系數對抗壓強度影響不大。Abstract:Theinfluenceofcoarseaggregate-spacecoefficientontherheologicalperformanceofself-compactingconcrete(SCC)isstudied.Theresultsindicatethatcoarseaggregate-spacecoefficienthassignificantinfluenceonslumpflowandV-funnelflowtimeofSCC,whenthemaximumaggregateparticlesizeis16mmandthevolumeratioofsandandmotoris0.43,meanwhilewaterbinderratiois0.38.Thehighercoarseaggregate-spacecoefficient,thelagerslumpflowandtheshorterV-funnelflowtime.Therangeofcoarseaggregate-spacecoefficientofSCCissuitablefor1.31～1.58undertheconditionofthepaper.ThesuitablerangecanguaranteeexcellentrheologicalperformanceandstabilityofSCCmixture.Thereislittleeffectofcoarseaggregate-spacecoefficientoncompressivestrengthinthispapertests.

蔣玉川,王陽,許金娥.粗骨料對自密實混凝土流變性能影響的研究[J].混凝土與水泥制品,2017(3):5-8. JIANG Y C, WANG Y, XU J E.Study of Effects of Coarse Aggregate on Rheological Properties for Self-compacting Concrete[J].China Concrete and Cement Products,2017(3):5-8.

不同溫度下水泥、粉煤灰再生微粉體系反應程度與抗壓強度關系

李琴1，張春紅2，陳秋玲3，孫可偉4

２０17年第3期

摘要

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摘要：根據共存于體系中水泥、活性物質水化反應中間物Ca(OH)2產生和消耗，研究其水化反應動力學特征，以此為基礎計算在不同養護溫度、養護時間及體系中粉煤灰量對水泥、活性物質的水化程度大小，并以此配比進行抗壓強度試驗。研究結果發現當養護溫度低于40℃時，體系的水化程度與抗壓強度均隨著溫度升高、齡期延長、粉煤灰量增加而提高；養護溫度高于40℃時，體系水化程度隨著溫度升高，齡期延長而升高，尤其是15%粉煤灰摻量時水泥能夠完全水化。高于40℃體系抗壓強度隨著溫度升高而降低，隨著齡期延長而增大，高溫時體系水化程度和抗壓強度變化趨勢不同。 Abstract: Cement and active substances hydration reaction kinetics characteristics are researched in the coexisting system by researching their hydration reaction intermediate Ca(OH)2 consumption rate. And the calculation on the hydration degree of cement and fly ash with the dosage of fly ash at different temperature and curing time is carried out. And the experiment ratio of the compressive strength on the recycle mortar is determined. The results shows that when the curing temperature is lower than 40℃, the degree of hydration and compressive strength of the system increases with the temperature, age extension and the fly ash dosage. When the curing temperature is higher than 40℃, the hydration degree increases with the temperature increase and age extension, especially when the fly ash content is 15%, the cement could be completely hydrated. The compressive strength of the system decreases with increasing temperature, when curing temperature is higher than 40℃, the trend of hydration and compressive strength varied with the age extension.

李琴,張春紅,陳秋玲,等.不同溫度下水泥、粉煤灰再生微粉體系反應程度與抗壓強度關系[J].混凝土與水泥制品,2017(3):9-14. LI Q, ZHANG C H, CHEN Q L,et al.Relationship Between Reaction Degree and Compressive Strength for Cement and Fly Ash Regeneration Powder System under Different Temperatures[J].China Concrete and Cement Products,2017(3):9-14.

消泡劑對灌漿料新拌漿體表觀質量的影響研究

徐海源1,2，沙建芳1,2，劉建忠1,2，郭飛1,2，吳洲1,2

２０17年第3期

摘要

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摘要：考查了不同消泡劑在各摻量時對灌漿料表觀質量的影響規律，并從消泡速率、流變性能、硬化后氣泡參數等方面對其作用機理進行了分析。結果表明，消泡劑品種對灌漿料表觀氣泡狀態影響明顯，相同摻量時，試驗中摻消泡劑PX-1灌漿料的表觀質量最優，PX-2其次，PX-3最差；優選合適消泡劑可提升灌漿料表觀質量的機理在于其消泡速率更快，同時還能改善漿體黏度，并降低了總氣泡及100μm以下氣泡的數量。 Abstract: The effects of different dosage of the different defoaming agents on apparent performance are studied, and the fluidit, the apparent bubble state, rheologica properties and air void parameters after hardening of the grouting material are investigated. The results show that the types of defoaming agents have obvious effect on apparent performance, for that best quality of grouting material of PX-1 with appropriate amount, PX-2 is in the next place, PX-3 is the worst. The reason for the improvement of the apparent quality of the grouting material lies in the speed of defoaming, increasing viscosity, and also can effectively reduce the total number of bubbles and the number of bubbles below 100μm.

徐海源,沙建芳,劉建忠,等.消泡劑對灌漿料新拌漿體表觀質量的影響研究[J].混凝土與水泥制品,2017(3):15-18. XU H Y, SHA J F, LIU J Z,et al.Influence Research of Defoaming Agent on Apparent Performance of Fresh Paste for Grouting Materials[J].China Concrete and Cement Products,2017(3):15-18.

摻超細灰混凝土早齡期體積穩定性研究

賈福杰，李長成，劉立

２０17年第3期

摘要

引用本文

摘要：利用超細粉磨設備將粉煤灰原灰進行超細磨后，進行了混凝土軸心抗壓強度試驗、混凝土半絕熱溫升試驗和凈漿干燥收縮試驗研究。試驗結果表明，與普通粉煤灰不同，超細粉煤灰對于混凝土早齡期7d抗壓強度也有所提高，隨著超細粉煤灰摻量的提高，混凝土28d和60d抗壓強度提高更多；摻超細粉煤灰對降低混凝土溫升的效果不明顯，其降低水化熱效果不如普通粉煤灰；隨著超細粉煤灰摻量提高，水泥凈漿試件的干燥收縮有減小的趨勢，對體積穩定性是有利的。 Abstract: After fly ash was superfine grinded with superfine grinding equipment, the compressive strength test of concrete with ultra-fine fly ash, drying shrinkage test and semi adiabatic temperature test were done, test results show that strength of concrete with ultra-fine fly ash at early age of 7d also increased, which was different from ordinary fly ash, with the increasing of ultra-fine fly ash content, concrete strength at age of 28d and 60d were improved a lot. The effect to reduce the temperature is not obvious for concrete with the superfine fly ash, which is not so good as ordinary fly ash. With the increase of ultra-fine fly ash, drying shrinkage of cement paste tend to have a decreasing trend, which is advantageous on the volume stability.

賈福杰,李長成,劉立.摻超細灰混凝土早齡期體積穩定性研究[J].混凝土與水泥制品,2017(3):19-22. JIA F J, LI C C, LIU L.Study on Volume Stability of Concrete Added Ultra-fine Fly Ash in Early Age[J].China Concrete and Cement Products,2017(3):19-22.

水泥基材料早期抗凍性的影響因素及作用機理

韓銘，趙安冬

２０17年第3期

摘要

引用本文

摘??要：研究了早期受凍環境下復合抗凍劑、受凍時間以及礦物摻合料對水泥基材料的力學性能、水化進程、水化產物以及孔結構分布的影響。結果表明，早期受凍時間越長，對早期強度發展的影響越大，強度越低，微觀結構越不利于性能的發展；復合抗凍劑對水泥水化進程、孔結構分布有很大的改善作用，水化硅酸鈣凝膠增多，Ca(OH)2的量減少，孔隙率和最可幾孔徑降低，多害孔減少，無害孔增多；礦物摻合料在有激發劑存在時可對水化進程和孔結構分布進行改善，減少具有局部脆弱缺陷結構的Ca(OH)2出現，促進團聚狀凝膠的形成，并細化孔徑，減少多害孔，提高早期抗凍性。Abstract:Theinfluenceofcompositeantifreeze,coldtimeandmineraladmixtureonthemechanicalpropertyofcement-basedmaterial,hydrationprocess,hydrationproductsandporedistributionatearlycoldenvironmentwasresearched.Theresultsshowthatwiththeextensionofearlycoldtime,theimpactonearlystrengthismoreserious,thelowstrengthleadtothedetrimentaldevelopmentofmicrostructure.Cementhydrationprocess,porestructurearegreatlyimprovedbyaddingcompositeantifreeze,hydrationcalciumsilicategelincreases,theamountofCa(OH)2decreases,themostprobableapertureandporosityandharmholedecreases,harmlessholeincrease.Thehydrationprocessandporestructuredistributioncanbeimprovedwiththemineraladmixtureaddedwiththepresenceofexcitant,theweakdefectstructureofCa(OH)2decrease,thereunificationofgelispromoted,theporesizeisrefinedandtheharmfulholeisdecreased,theearlyfrostresistanceisimproved.

韓銘,趙安冬.水泥基材料早期抗凍性的影響因素及作用機理[J].混凝土與水泥制品,2017(3):23-26. HAN M, ZHAO A D.Effecting Factors and Mechanism of Early Frost Resistance for Cement-based Materials[J].China Concrete and Cement Products,2017(3):23-26.

C80高石粉含量機制砂高性能混凝土試驗研究

胡曉曼1,2，李亞南1,2

２０17年第3期

摘要

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摘要：通過原材料的優選和配合比的優化，配制出C80高石粉含量機制砂高性能混凝土，并對其長期性能和耐久性能進行試驗研究。結果表明：與同配合比的河砂混凝土相比，C80機制砂混凝土在工作性、強度、干縮、早期抗裂性、抗氯離子滲透及抗碳化方面性能較好，可完全替代河砂混凝土。 Abstract：By optimization of raw materials and mixture ratio，C80 high-stone-powder MS-HPC is prepared, and long-term performance and durability are studied. The results show that C80 MS-HPC has better performance compared with C80 river sand concrete in workability, strength, shrinkage, early cracking, resistance to chloride ion permeability, and it can completely replace river sand concrete.

胡曉曼,李亞南.C80高石粉含量機制砂高性能混凝土試驗研究[J].混凝土與水泥制品,2017(3):27-30. HU X M, LI Y N.Experimental Research on C80 High-stone-powder Manufactured Sand-High Performance Concrete[J].China Concrete and Cement Products,2017(3):27-30.

我國水泥混凝土制品行業“十三五”技術標準體系建設方案研究

奚飛達1,2，高穎1，王春蓉1

２０17年第3期

摘要

引用本文

摘要：根據我國水泥混凝土制品行業產業技術的發展情況,分析了該行業標準化現狀及存在的問題；提出了水泥混凝土制品行業在“十三五”期間制修訂標準的主要工作任務和工作重點；建立了“十三五”水泥混凝土制品行業的技術標準體系建設方案。 Abstract: According to the development situation of cement concrete products industrial technology in China, standardization status and existing problems of the cement concrete products industry are analyzed.The main tasks and focus of formulating and revising cement concrete products industrial standards during China’s 13th five-year plan period are put forward, and the cement concrete products industry technical standard system construction plan during China’s 13th five-year plan period is set up.

奚飛達,高穎,王春蓉.我國水泥混凝土制品行業“十三五”技術標準體系建設方案研究[J].混凝土與水泥制品,2017(3):31-36. XI F D, GAO Y, WANG C R.Study on Technical Standard System Construction Plan of Cement Concrete Products Industry During China's 13th Five-year Plan Period[J].China Concrete and Cement Products,2017(3):31-36.

PHC管樁鋼筋銹蝕年限預估

李龍，何友林

２０17年第3期

摘要

引用本文

摘要：采用CECS 220:2007《混凝土結構耐久性評定標準》中的相關公式，嘗試在氯鹽腐蝕環境下，對采用壓蒸工藝和免壓蒸工藝的PHC管樁中鋼筋的銹蝕年限進行預估。計算結果表明，在設定氯離子濃度下，采用壓蒸工藝的PHC管樁產品，其保護層厚度為40mm時，管樁中鋼筋開始銹蝕的時間為43年，若保護層厚度為45mm時，管樁中鋼筋開始銹蝕的時間為54年。采用免壓蒸工藝生產的PHC管樁產品其保護層厚度為40mm時，管樁中鋼筋開始銹蝕的時間為130.6年，若保護層厚度為45mm時，管樁中鋼筋開始銹蝕的時間為165年。增加保護層厚度或提高管樁混凝土的抗滲能力可提高PHC管樁的抗氯鹽腐蝕能力。 Abstract: Based on the correlation formula of CECS 220∶2007 Standard for durability assessment of concrete structures, the life of reinforcement corrosion of PHC piles using the autoclave process and non-autoclave pressure process is estimated under the chlorine salt corrosion environment.The calculation results show that under the setting of chlorine ion concentration, using autoclave process, the protection of reinforcement corrosion of PHC piles is 43years when the thickness of protective layer is 40mm and the protection of reinforcement corrosion of PHC piles is 54years when the thickness of protective layer is 45mm; using non-autoclave process, the protection of reinforcement corrosion of PHC piles is 130.6years when the thickness of protective layer is 40mm and the protection of reinforcement corrosion of PHC piles is 165years when the thickness of protective layer is 45mm. Increasing concrete protective layer thickness or improving the impermeability of pile concrete can improve the ability of chlorine salt corrosion resistance of PHC piles.

李龍,何友林.PHC管樁鋼筋銹蝕年限預估[J].混凝土與水泥制品,2017(3):37-38. LI L, HE Y L.Years Prediction of Corrosion of PHC Pile Steel Bar[J].China Concrete and Cement Products,2017(3):37-38.

方鋼管再生混凝土長柱偏心受壓性能有限元分析

吳先哲，張兆強，姚勇

摘要

引用本文

摘要：在8根方鋼管再生混凝土長柱偏心受壓試件試驗研究的基礎上，利用有限元軟件ANSYS建立了方鋼管再生混凝土長柱偏心受壓的計算模型。通過計算得出了荷載-位移曲線，分析了構件的變形性能以及長細比、偏心距等因素對極限承載力的影響，并將計算結果與試驗結果進行了對比分析。結果表明：方鋼管再生混凝土長柱偏壓構件主要表現為整體失穩破壞；其偏壓彈性剛度隨長細比及偏心距的增大呈先增后減的趨勢；延性及軸向耗能能力隨長細比的增大呈先減后增的趨勢，隨偏心距的增大呈先增后減的趨勢；構件極限承載力隨長細比及偏心距的增大而減??；計算結果與試驗結果吻合良好，能夠較真實地反映試驗結果，所建立的有限元模型能夠有效地對方鋼管再生混凝土柱偏壓力學性能進行全過程分析。 Abstract: Based on the experiment, eight recycled aggregate concrete filled steel tubular long columns finite element models are built by using the finite element software ANSYS. Through the nonlinear computation, the load-displacement curves of the models are obtained, the axial deformation performance of the artifacts, the influence of slenderness ratio and eccentricity on ultimate bearing capacity are analyzed and the calculated results are compared with the experimental results in order to analyze the similarities and differences. The results indicate that recycled aggregate concrete filled steel tubular long columns show the overall instability damage; the elastic stiffness tends to first increase and then decrease with the increasing of slenderness ratio and eccentricity, the axial energy dissipation capacity and the ductility tend to first decrease and then increase with the increase of slenderness ratio, but tend to first increase and then decrease with the increasing of eccentricity;the component bearing capacity decreases with the increase of slenderness ratio and eccentricity. The calculation results are in good agreement with the experiment results, it can truly reflect the experimental results, and the finite element model can effectively analysis the mechanical properties of recycled aggregate concrete filled square steel tubular long columns under eccentric compression loading.

吳先哲,張兆強,姚勇.方鋼管再生混凝土長柱偏心受壓性能有限元分析[J].混凝土與水泥制品,2017(3):39-43. WU X Z, ZHANG Z Q, YAO Y.Finite Element Analysis on Eccentric Compression Properties of Recycled Aggregate Concrete Filled Steel Tubular Columns[J].China Concrete and Cement Products,2017(3):39-43.

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