2017_2017_《混凝土與水泥制品》雜志社

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2017

低鈣粉煤灰粒度對水泥-粉煤灰復合膠凝材料力學性能與水化性能的影響

周祥，李玉香，鄭召，馬雪，倪倩

２０17年第1期

摘要

引用本文

摘??要：為了實現粉煤灰的高效利用，通過旋風分級機將原狀粉煤灰分成D50=5.06μm、15.63μm、35.01μm三個不同的粒度區間。不同粒度粉煤灰按照0、10%、20%和30%替代硅酸鹽水泥。研究了粉煤灰粒度對水泥膠砂強度和水化性能的影響。結果表明，隨著粉煤灰粒徑的減小，粉煤灰水泥的各齡期強度都逐漸增加，摻入適量細粒度粉煤灰，水泥各齡期膠砂強度超過了硅酸鹽水泥；粉煤灰水泥的水化放熱速率和累積放熱量都低于硅酸鹽水泥，隨著粉煤灰粒徑的減小，粉煤灰水泥的水化放熱速率和累積放熱量增加。3d齡期時，粉煤灰水泥漿體Ca(OH)2峰強度與硅酸鹽水泥幾乎相同；60d齡期時，隨著粉煤灰顆粒粒徑的減小，粉煤灰水泥漿體Ca(OH)2峰的強度明顯減??；SEM-EDS分析表明，細粒度區間的粉煤灰水泥漿體比粗粒度區間的粉煤灰水泥漿體具有更致密的漿體結構且粉煤灰顆粒水化生成的是一種低Ca/Si的C-S-H凝膠。Abstract:Toachievethehighefficientutilizationofflyash,alowcalciumoriginalflyashwasclassifiedinto3fractionsbyanairclassfier,withmedianparticlesizeof5.06μm,15.63μm,35.01μm，respectively.ThreesizesofflyashwereusedtopartiallyreplacePortalandcementat0，10%，20%and30%byweight.Theeffectofsizefractiononstrengthandhydrationpropertyofflyash-cementcomplexcementitiousmaterialsincorporatingflyashwasstudied.Testresultsindicatedthatwiththedeclineinthesizeofflyash,thestrengthofflyash-cementmortarsincreased.AndcementwithappropriatecontentoffineflyashshowedhigherstrengththanPortlandcementateveryage.TheheatevolutionresultsshowedthattherateofheatevolutionandcumulativeheatoftheflyashcementwerelowerthanPortlandcement.Withthedeclineinthesizeofflyash,therateofheatevolutionandcumulativeheatoftheflyashcementincreased.TheX-raydiffraction(XRD)resultsshowedthattheintensitypeaksofCa(OH)2offlyashcementwerealmostsimilartoPortlandcementat3days.However,withthedeclineinthesizeofflyash,theintensitypeaksofCa(OH)2offlyashcementdecreasedobviouslyat60days.Thescanningelectronmicroscope(SEM-EDS)resultsrevealedthatthehardenedblendedcementpastecontainingfinerflyashproducedadenserstructureandthesurfaceofflyashproducedC-S-HgelwithlowCa/Simolarduringpozzolanicreaction.

周祥,李玉香,鄭召,等.低鈣粉煤灰粒度對水泥-粉煤灰復合膠凝材料力學性能與水化性能的影響[J].混凝土與水泥制品,2017(1):1-7. ZHOU X,LI Y X,ZHENG Z,et al.Influence of Size Fraction of Low Calcium Fly Ash on Mechanical Performance and Hydration Properties of Cement-fly Ash Composite Gel Materials[J].China Concrete and Cement Products,2017(1):1-7.

摻合料對膠凝體系早期水化放熱和力學特性的影響

錢文勛1,2，陳迅捷1,2，韋華1,2，王新1

２０17年第1期

摘要

引用本文

摘要：膠凝材料水化熱是水工大體積混凝土的關鍵熱學參數，直接影響水工混凝土的溫控設計。本文采用熱導式等溫量熱儀試驗研究水泥基膠凝材料體系中各種摻合料對水泥水化放熱過程的影響，結合其早期強度發展，探討不同摻合料對水泥基膠凝材料體系早期放熱過程和強度的影響規律，為大體積混凝土中摻合料的應用提供技術支撐。研究結果表明，選用的摻合料方案其早齡期水化放熱量與對應的早期抗壓強度有較好的線性相關，根據早期強度設計要求和水化熱控制需要，優先考慮粉煤灰、礦渣粉單摻或者復摻方案。 Abstract: Hydration heat of cementitious materials is a key thermal parameter of hydraulic mass concrete. The temperature control design of hydraulic concrete is directly decided by it. In this paper, isothermal calorimeter was applied to study the effects of various blending materials on early hydration heat proceeding as well as early development of strength, which provided technical support of the mineral admixture utilization in mass concrete. Results indicated that there was a decent linear correlation between early hydration heat and compressive strength of the selected mineral admixture proportion. While in practical engineering application, considering the demands for early design strength and controlled hydration heat, fly ash, slag or their combined mix were suggested.

錢文勛,陳迅捷,韋華,等.摻合料對膠凝體系早期水化放熱和力學特性的影響[J].混凝土與水泥制品,2017(1):8-11. QIAN W X,CHEN X J,WEI H,et al.Effects of Mineral Admixtures on Early Hydration Heat and Mechanical Characteristic of Cementitious System[J].China Concrete and Cement Products,2017(1):8-11.

濕熱循環作用對高性能混凝土強度及抗滲性能影響的試驗研究

張智

２０17年第1期

摘要

引用本文

摘??要：為研究濕熱循環作用對高性能混凝土強度和抗滲性能的影響，通過試驗測定了濕熱循環次數對HPC30、HPC50和UHPC三種混凝土抗壓強度、劈裂抗拉強度和吸水量的影響。結果顯示，HPC30和HPC50的抗壓強度隨濕熱循環次數的增多呈前期（0～90次）和后期（90～300次）兩個變化階段，濕熱循環前期，增加循環次數使抗壓強度增大，而濕熱循環后期，增加循環次數反而會使抗壓強度降低；UHPC的抗壓強度隨循環次數的增多而降低。隨著濕熱循環次數的增加，三種混凝土的劈裂抗拉強度都表現出先增大后減小的變化趨勢。增加濕熱循環次數，會使HPC30和HPC50的抗滲性能得到改善，而使UHPC的抗滲性能降低。Abstract：Inordertostudytheeffectofheat-moisturecycleonthestrengthandimpermeabilityofHPC,theinfluenceofthenumberofwet-heatcyclesonthecompressivestrength,splittingtensilestrengthandwaterabsorptionofHPC30,HPC50andUHPCconcretewastested.TheresultsshowedthatthecompressivestrengthofHPC30andHPC50increasedwiththeincreaseofthenumberofhotandhumidcycles(0～90times)andlater(90～300times).ThecompressivestrengthofHPC30andHPC50increasedwiththeearliernumbersofcycles,anddecreasedwiththeincreaseofthelaternumbersofcycles.ThecompressivestrengthofUHPCdecreasedwiththeincreaseofthenumbersofcycle.Thesplittingtensilestrengthofthethreekindsofconcreteincreasedfirstandthendecreasedwiththeincreaseofthenumbersofdampheatcycles.Increasingthenumberofhotandhumidcycles,HPC30andHPC50willimprovetheimpermeability,whileUHPCimpermeabilitywillreduce.

石首長江大橋大體積混凝土試驗研究

邊曉明，劉小翠，雷敬偉

２０17年第1期

摘要

引用本文

摘要：針對大體積混凝土的特點，研究了粉煤灰與高性能減水劑雙摻、粉煤灰＋礦粉與高性能減水劑雙摻、粉煤灰＋礦粉與高性能減水劑再加聚丙烯纖維三摻配比對大體積混凝土物理力學性能和耐久性能的影響。試驗結果表明，采用礦物摻合料（粉煤灰＋礦粉）與高性能減水劑+聚丙烯纖維三摻配比的混凝土具有良好的工作性能、力學性能和耐久性能，成功用于石首長江大橋主墩承臺施工。 Abstract: Based on the characteristics of mass concrete, the effects of fly ash and high performance water reducing admixture double mixed, mineral admixture (fly ash + mineral powder) and high performance water reducing admixture double mixed, mineral admixture (fly ash + mineral powder) + high performance water reducing agent plus polypropylene fiber three-doped ratio on the physical and mechanical properties and durability of concrete were studied. With the mineral admixture (fly ash + mineral powder) + high performance water reducing agent plus polypropylene fiber three-doped ratio, the concrete has good work performance, mechanical properties and durability, which is successfully used in Shishou Yangtze River Bridge main pier bearing platform construction.

邊曉明,劉小翠,雷敬偉.石首長江大橋大體積混凝土試驗研究[J].混凝土與水泥制品,2017(1):17-21. BIAN X M,LIU X C,LEI J W.Experimental Study on Mass Concrete for Shishou Yangtze River Bridge[J].China Concrete and Cement Products,2017(1):17-21.

C60鋼管自密實混凝土的配制及早期收縮性能研究

斯方海1，陳社生1，韓大富2，李增福2，王珂3，朱玲3

２０17年第1期

摘要

引用本文

摘要：鋼管自密實混凝土很好地將自密實混凝土優異的施工性能應用到鋼管混凝土中，有利于解決鋼管混凝土中灌注工藝和振搗工藝的施工難點。本文根據具體工程要求，利用地方材料配制出C60鋼管自密實混凝土并應用于超高層建筑中，工程使用情況良好。由于現有混凝土限制膨脹率的檢測與實體差別較大，本文采用小鋼桶模擬實體檢測鋼管自密實混凝土的自收縮，較好地反映了實體中混凝土的自收縮情況，且通過小鋼桶拆開觀察可以側面反映混凝土與鋼管壁的黏接情況。 Abstract: Self compacting concrete is very good for the application of self compacting concrete in the concrete filled steel tube when applied to concrete filled steel tube, which helps to solve its difficulties in perfusion technology and vibrating process. According to the specific engineering requirements, the use of the project is well when using local materials to prepare the C60 steel self compacting concrete. Because the difference is larger between limit expansion ratio test and the real in existing concrete, in this paper, the small steel drum simulation entity detection autogenously shrinkage of self-compacting concrete filled steel tube can preferably reflect the autogenously shrinkage of concrete in the entity, and can reflect the adhesive of concrete and steel tube wall through separating the small steel drum.

斯方海,陳社生,韓大富,等.C60鋼管自密實混凝土的配制及早期收縮性能研究[J].混凝土與水泥制品,2017(1):22-25+30. SI F H,CHEN S S,HAN D F,et al.Research on Preparation and Early-age Shrinkage Properties of C60 Steel Self-compacting Concrete[J].China Concrete and Cement Products,2017(1):22-25+30.

不同養護方式下可再分散乳膠粉改性砂漿的性能

汪勝，郭玉林，譚洪波，鄒府兵，馬保國

２０17年第1期

摘要

引用本文

摘要：研究了三種不同養護方式（60℃蒸汽養護、飽和石灰水浸泡養護、早期水中-后期空氣中養護）對摻入不同劑量的乙烯-醋酸乙烯共聚物可再分散乳膠粉（EVA乳膠粉）改性砂漿性能的影響規律。結果表明：隨著EVA乳膠粉摻量的增加，砂漿的流動度先增大后減小，吸水率先減小后增大，且EVA摻量為4%時，砂漿流動性最好，摻量為6%時砂漿吸水率最??；砂漿抗折強度先增大后減小，且在4%摻量時取得最大值，而抗壓強度一直減小，砂漿的壓折比呈現出先減小后保持基本不變，并在4%乳膠粉摻量時有較低值；蒸汽養護最有利于聚合物砂漿結構的致密及強度的發展，而飽和石灰水浸泡養護對其致密性和強度最不利。 Abstract: The research of the influence rules of three different curing methods (60℃ steam curing, saturated limewater soaking curing, water immersion early and stand in air latterly) on performance of mortar modified with ethylene/vinyl acetate copolymer latex powder (EVA latex powder) in varies of dosages is carried out. The results show that with the increasing of EVA dosage, mortar’s fluidity increases first and then decreases, while the water absorption reduces first then arises, the fluidity of mortar reaches the best when EVA dosage is 4%, and water absorption is lowest when EVA is 6%; The flexural strength of mortar increases first and decreases later and gets the maximum value when EVA content is 4%, moreover, compressive strength keeps reducing, in addition, the ratio of compressive strength to flexural strength of mortar first decreases and then remains essentially unchanged. Steam curing is most conducive to the structure densification of the polymer mortar and its strength, while the saturated limewater soaking curing creates just the opposite effect.

汪勝,郭玉林,譚洪波,等.不同養護方式下可再分散乳膠粉改性砂漿的性能[J].混凝土與水泥制品,2017(1):26-30. WANG S,GUO Y L,TAN H B,et al.Performance of Redispersion Emulsoid Powder Modified Mortar under Different Curing[J].China Concrete and Cement Products,2017(1):26-30.

高強再生骨料混凝土的耐久性能及影響因素研究

許穎，劉杰，唐天佑

２０17年第2期

摘要

引用本文

摘要: 目前，國內外所制備的再生骨料混凝土的強度值都較低，只能用于非承重構件，另外對再生骨料混凝土耐久性方面的研究仍不多。本文利用廢棄混凝土，按照所提出的一種新生產工藝制備再生骨料，然后按照要求配制成高強度再生骨料混凝土。研究發現：采用取代率為50%的再生粗骨料和取代率為30%的再生細骨料所配制的再生骨料混凝土強度能夠達到高強混凝土強度要求。此外，本文研究了高強再生骨料混凝土的耐久性能，探討了粉煤灰、二次攪拌、再生粗骨料最大粒徑和初始含水狀態對高強再生骨料混凝土的收縮性能、抗碳化性能、抗氯離子滲透性能和抗硫酸鹽侵蝕性能的影響。 Abstract: At present, the strength of recycled aggregate concrete is normally low in China and abroad and it can only be used for non-bearing components. Moreover, there are few studies on the durability of recycled aggregate concrete. In this paper, waste concrete is used to prepare recycled aggregate according to the new proposed preparation process, and high strength recycled aggregate concrete is then prepared. It is found that the strength of recycled aggregate concrete with 50% replacement rate of recycled coarse aggregate and 30% replacement rate of recycled fine aggregate could meet the requirement of high strength concrete. In addition, this study evaluates durability of high strength recycled aggregate concrete prepared by the new process. The influences of fly ash, mixing method, maximum size of recycled coarse aggregate and initial water content of recycled coarse aggregate on shrinkage, carbonation resistance, resistance to chloride ion penetration and sulfate attack are also investigated.

許穎,劉杰,唐天佑.高強再生骨料混凝土的耐久性能及影響因素研究[J].混凝土與水泥制品,2017(2):1-8. XU Y,LIU J, TANG T Y.Research on Durability and Influence Factors of High Strength Recycled Aggregates Concrete[J].China Concrete and Cement Products,2017(2):1-8.

預制拼裝綜合管廊發展現狀及接頭防水密封性能的探討

嚴林

２０17年第1期

摘要

引用本文

摘要: 城市地下綜合管廊已成為市政管線集約化建設的趨勢。接頭防水密封性能是影響綜合管廊建設的重要因素。本文對綜合管廊接頭防水密封的性能進行了探討，初步提出了多道防水的技術方案，以期提高綜合管廊接頭的防水密封性能。 Abstract: The construction of urban underground pipe gallery has become the trend of municipal pipelines integrated construction. As an important factor, the poor joint sealing performance limit the further development of pipe gallery. Here, the joint waterproofing property of pipe gallery is discussed, and the multi-channel waterproofing project is proposed to improve the water resistance of the pipe gallery.

嚴林.預制拼裝綜合管廊發展現狀及接頭防水密封性能的探討[J].混凝土與水泥制品,2017(1):31-34. YAN L.Discussion for Development Status of Precast Assembly Utility Tunnel and Water Resistance Sealing Performance of Joint[J].China Concrete and Cement Products,2017(1):31-34.

PCCP斷絲的電磁法檢測技術研究及其應用

田華1，彭正輝2，徐進3，朱今祥2，吳燕民2，管英祥2，于符靜1

２０17年第1期

摘要

引用本文

摘要：基于遠場渦流檢測的基本原理，給出了PCCP斷絲檢測的硬件檢測系統，并通過搭建PCCP斷絲檢測平臺，解決了PCCP斷絲在檢測中的靈敏度問題、斷絲位置與檢測信號相位之間的關系、斷絲數目與檢測信號幅度之間的關系等關鍵技術。為進一步進行PCCP斷絲檢測工程化應用,給出了PCCP斷絲檢測儀器標定曲線的標定標準。通過被測管道數據曲線與標定曲線的比較，可以定量判斷管道內鋼絲斷絲的數量。 Abstract: Based on the basic principle of Remote field eddy current detection, the hardware detection system for broken wires of PCCP is given, and through PCCP broken wire detection platform, the key technologies are solved such as the detection sensitivity problem of PCCP broken wires, the relationship between the position of broken wires and signal detection phase and between the number of broken wires and the amplitude of signal detection. For further engineering application of PCCP broken wire detection technology, calibration standard of calibration curve got by PCCP broken wire detection device is given. Compared test data curve with calibration curve of tested pipeline, the number of wire broken wires can be quantitatively determined in the pipeline.

田華,彭正輝,徐進,等.PCCP斷絲的電磁法檢測技術研究及其應用[J].混凝土與水泥制品,2017(1):35-38. TIAN H,PENG Z H,XU J,et al.Study on Electromagnetic Detection Technology of PCCP Broken Wire and Its Application[J].China Concrete and Cement Products,2017(1):35-38.

免蒸養高耐久性PHC管樁的研究與應用

王成啟1，周郁兵2，張宜兵2

２０17年第1期

摘要

引用本文

摘要：為有效降低PHC管樁生產過程中的能耗及簡化生產工序，采用優選的混凝土配合比和早期保溫養護措施，并充分利用環境溫度對PHC管樁的作用，開發出了免蒸養高耐久性PHC管樁工藝技術。試驗結果及工程應用情況表明，免蒸養PHC管樁混凝土的抗壓強度完全能滿足規范要求，具有較高的彈性模量、耐久性，可有效降低PHC管樁的生產能耗，且沉樁效果良好。 Abstract: To reduce energy consumption in producing PHC piles, non-steam curing PHC pile technology was developed by adopting optimized concrete mix proportion and early heat preservation curing as well as ambient temperature effect. The test results and engineering application show that compressive strength of non-steam PHC piles produced by the non-steam curing technology can conform to the requirements of specifications and standards, its modulus of elasticity and durability are excellent. Meanwhile, the mechanical properties and its durability of non-steam PHC piles and effect of piling are good.The non-steam curing PHC pile technology may markedly reduce energy consumption.

王成啟,周郁兵,張宜兵.免蒸養高耐久性PHC管樁的研究與應用[J].混凝土與水泥制品,2017(1):39-42. WANG C Q,ZHOU Y B,ZHANG Y B.Research and Application on Non-steam Curing PHC Pile with High Durability[J].China Concrete and Cement Products,2017(1):39-42.

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