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    蘇州混凝土水泥制品研究院有限公司

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    發布時間:2020-01-06 00:00:00
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    第十期

    復合改性再生混凝土抗氯離子滲透性能
    復合改性再生混凝土抗氯離子滲透性能
    • 肖建莊1, 2,李 標1,楊錢榮2,楊曉斌3
    2019年第10期
    摘要
    引用本文
    摘 要:提出了粉煤灰和納米SiO2的復合改性方法,使用質量取代法,研究了粉煤灰和納米SiO2單摻及復摻對再生混凝土(RAC)抗氯離子滲透性能(84 d)的影響。結果表明,再生粗骨料全部取代天然粗骨料會顯著降低抗氯離子滲透性能,84 d氯離子遷移系數和電通量分別提高了101.7%和89.1%;單摻SiO2或粉煤灰時,隨著取代率的提高抗氯離子滲透性能越好。復摻納米SiO2和粉煤灰能夠產生疊加效應,顯著提高RAC的抗氯離子滲透性能,其中復摻2%納米SiO2與30%粉煤灰時84 d氯離子遷移系數和電通量分別降低了72.3%和89.1%,甚至優于普通混凝土,并且相同摻量的納米SiO2對30%的粉煤灰改性效果更好。 Abstract: A method to modify recycled aggregate concrete (RAC) by combining Nano-silica and fly ash was put forward, and the effect of Nano-silica and fly ash on iron penetration resistance (84 d) of RAC was investigated using mass substitution method to replace natural aggregate (NA) by recycled aggregate (RA). Results show that RA can decrease the ability of concrete to resist iron penetration significantly, the coefficient of chloride migration and electric flux increased 101.7% and 89.1% respectively. Using Nano-silica and fly ash alone can intensify the resistance to iron penetration with the increase of dosage. Moreover, combination of Nano-silica and fly ash can perform excellent synergistic effect on resistance to iron penetration better than single effect of both of them. Among them, combining 2% Nano-silica and 30% fly ash reduce the coefficient of chloride migration and electric flux by 72.3% and 89.1% at curing age of 84 d respectively.
    肖建莊,李標,楊錢榮,等.復合改性再生混凝土抗氯離子滲透性能[J].混凝土與水泥制品,2019(10):1-5. XIAO J Z,LI B,YANG Q R,et al.Study on Chloride Penetration Resistance of Compound Modified Recycled Concrete[J].China Concrete and Cement Products,2019(10):1-5.
    水化熱抑制劑和氧化鎂對水工自密實混凝土性能的影響
    水化熱抑制劑和氧化鎂對水工自密實混凝土性能的影響
    • 李 響1,高志揚1,章 鵬2,黃鶴程2,劉力捷3,周世華1
    2019年第10期
    摘要
    引用本文
    摘 要:研究了摻加水化熱抑制劑和(或)氧化鎂的水工自密實混凝土工作性能、抗壓強度、絕熱溫升、自生體積變形等性能發展規律。結果表明,外摻5%氧化鎂對水工自密實混凝土抗壓強度影響不大,摻有1%水化熱抑制劑的水工自密實混凝土早期成熟度低,后期抗壓強度與空白樣相差無幾。氧化鎂的摻入使得水工自密實混凝土的最終絕熱溫升值略有增加,單摻水化熱抑制劑混凝土早期絕熱溫升值較不摻抑制劑的水工自密實混凝土低約(10~20) ℃,10 d后與空白樣相差不大。外摻氧化鎂的水工自密實混凝土360 d自生體積變形值可達147×10-6且依舊保持繼續膨脹趨勢,相比于單摻氧化鎂混凝土,復摻氧化鎂和水化熱抑制劑混凝土的自生體積變形值約有15%的下降。 Abstract: The performance including workability, compressive strength, autogenous volume deformation and adiabatic temperature rise development of hydraulic self-compacting concrete containing hydrothermal inhibitor and (or) magnesium oxide were investigated. The results show that the addition of 5% magnesium oxide has little influence on the compressive strength of hydraulic self-compacting concrete. The early maturity of hydraulic self-compacting concrete mixed with 1% hydrothermal inhibitor is low, and the later compressive strength is almost the same as that of blank sample. The adiabatic temperature rise of hydraulic self-compacting concrete containing magnesium oxide increased slightly. Compared with blank sample, the adiabatic temperature rise in early stage of hydraulic self-compacting concrete mixed with 1% hydrothermal inhibitor is lower than about 10~20 degrees centigrade, and the difference is not significant after 10 d. The autogenous volume deformation value of hydraulic self-compacting concrete with magnesium oxide can reach 147×10-6 at curing stage of 360 d, and it still keeps the expansion trend. Compared with self-compacting concrete adding magnesium oxide, the autogenous volume deformation of hydraulic self-compacting concrete complicated with magnesium oxide and hydrothermal inhibitor decrease by about 15%.
    李響,高志揚,章鵬,等.水化熱抑制劑和氧化鎂對水工自密實混凝土性能的影響[J].混凝土與水泥制品,2019(10):6-9. LI X,GAO Z Y,ZHANG P,et al.Influence of Hydrothermal Inhibitor and Magnesium Oxide on the Performance of Hydraulic Self-compacting Concrete[J].China Concrete and Cement Products,2019(10):6-9.
    混凝土不同裂縫尺寸及部位碳化性能試驗研究
    混凝土不同裂縫尺寸及部位碳化性能試驗研究
    • 唐先習,劉 博,張景偉
    2019年第10期
    摘要
    引用本文
    摘 要:對預制裂縫混凝土試件進行了快速碳化試驗,研究了碳化時間、裂縫尺寸、裂縫表面及底部等因素對開裂試件碳化深度的影響。結果表明:不同混凝土裂縫寬度、深度下的碳化深度隨時間呈速度遞減的增長趨勢,并且隨著裂縫深度的遞增,碳化區域呈現出明顯的“倒三角”分布。碳化數據對比時引入碳化參數可以較好地反映不同裂縫深度處、裂縫底部碳化深度分別與表面碳化深度之間的關系。 Abstract: Based on the rapid carbonization test of precast cracked concrete, the influence factors such as carbonization time, crack size, crack surface and bottom on the carbonation depth of cracked concrete are researched. The correlation degree between crack width and depth is analyzed according to the gray theory, and GM model is used to predict the carbonation depth of crack concrete. The results of research show that the carbonation depth of concrete with different crack widths and depths increases with time, and with the increase of crack depth, the carbonation area presents an obvious "inverted triangle" distribution. By introducing the carbonization parametersandinto the comparison of carbonization data, the relationship between the surface carbonization depth and the carbonization depth at different crack depths or at the bottom of cracks can be well reflected respectively.
    唐先習,劉博,張景偉.混凝土不同裂縫尺寸及部位碳化性能試驗研究[J].混凝土與水泥制品,2019(10):10-13. TANG X X,LIU B,ZHANG J W.Research on Carbonation Performance of the Concrete with Different Sizes and Locations Crack[J].China Concrete and Cement Products,2019(10):10-13.
    活性粉末混凝土組成材料及制備方式研究綜述
    活性粉末混凝土組成材料及制備方式研究綜述
    • 張榮華1,徐 迅1,羅宏偉2,劉應虎3,周雙喜4
    2019年第10期
    摘要
    引用本文
    摘 要:從骨料、礦物摻合料、纖維等組成材料以及制備方式等對活性粉末混凝土(RPC)性能的影響進行了分析研究。針對RPC目前存在的主要問題,提出了制備性價比優良的RPC原材料選擇方面的建議和今后的主要研究及應用方向;研究認為,合理選擇價格低廉的原材料甚至固體廢棄物、簡化制備方式可以制備出性能優良的RPC,提高RPC的性價比有利于促進其推廣應用。 Abstract: The effects of aggregates, mineral admixtures, fibers and other materials on the performance of reactive powder concrete(RPC) are reviewed. The main problems existing in RPC are pointed out, and some suggestions are put forward?on the selection of raw materials for RPC with excellent cost performance. The main application directions of RPC materials are analyzed. The research results show that selecting low-cost raw materials or even solid waste and simplifying the preparation method can prepare RPC with excellent performance, and improving the cost performance of RPC is conducive to promoting the popularization and application of RPC.
    張榮華,徐迅,羅宏偉,等.活性粉末混凝土組成材料及制備方式研究綜述[J].混凝土與水泥制品,2019(10):14-18. ZHANG R H,XU X,LUO H W,et al.Review of Research on Composition Materials and Preparation Methods of Reactive Powder Concrete[J].China Concrete and Cement Products,2019(10):14-18.
    凍融與硫酸鹽復合侵蝕下粉煤灰混凝土的耐久性研究
    凍融與硫酸鹽復合侵蝕下粉煤灰混凝土的耐久性研究
    • 吳文燕,李小山
    2019年第10期
    摘要
    引用本文
    摘 要:通過分析混凝土表觀變化形態、抗壓強度和相對動彈性模量隨凍融循環次數變化的規律,討論了不同粉煤灰摻量混凝土(0、10%、20%)與5%Na2SO4溶液耦合作用下的損傷劣化機理。借助SEM和XRD技術研究了混凝土微觀結構和侵蝕產物發展演化規律,并綜合熱分析技術定量分析了不同粉煤灰摻量對混凝土抗凍融與硫酸鹽復合侵蝕能力的影響。結果表明:在凍融試驗終止時,10%、20%粉煤灰摻量混凝土強度損失率分別為60.36%、83.67%,10%粉煤灰摻量相對于20%粉煤灰摻量混凝土具有良好的抗凍性。在凍融循環100次前,混凝土試樣相對動彈模量一直處于遞增狀態。在硫酸鹽侵蝕條件下,混凝土中鈣礬石含量要多于石膏。在凍融循環50次時,不同粉煤灰摻量混凝土試樣中侵蝕產物含量大小排序為:20%粉煤灰>未摻粉煤灰>10%粉煤灰。 Abstract: Based on the variation of apparent morphology, compressive strength and relative dynamic modulus of elasticity with the number of freeze-thaw cycles, the damage degradation mechanism of concrete with different fly ash content (0,10%,20%) coupled with 5% Na2SO4 solution was studied. By means of SEM and XRD technology, the development and evolution of concrete microstructure and corrosion products were observed, and the corrosion products of concrete with different fly ash content were quantitatively analyzed by comprehensive thermal analysis technology. Furthermore, the influence of fly ash content on concrete resistance to freeze-thaw and sulfate combined erosion is analyzed.The results show that at the end of freeze-thaw test, the strength loss rates of concrete with 10% and 20% fly ash are 60.36% and 83.67% respectively. The concrete with 10% fly ash has good frost resistance compared with concrete with 20% fly ash. Before 100 freeze-thaw cycles, the relative dynamic elastic modulus of concrete specimens is increasing. The content of ettringite in concrete is higher than gypsum under the condition of sulfate attack. Under the condition of 50 freeze-thaw cycles, the results of comprehensive thermal analysis show that the order of corrosion products content of concrete with different fly ash content is: 20% fly ash > without fly ash > 10% fly ash.
    吳文燕,李小山.凍融與硫酸鹽復合侵蝕下粉煤灰混凝土的耐久性研究[J].混凝土與水泥制品,2019(10):19-23. WU W Y,LI X S.Study on the Durability of Fly Ash Concrete under the Combined Freeze-thaw and Sulfate Erosion[J].China Concrete and Cement Products,2019(10):19-23.
    基于抗壓強度的負溫混凝土受凍臨界強度研究
    基于抗壓強度的負溫混凝土受凍臨界強度研究
    • 江守恒1,董淑慧2,朱衛中3,李鶴斌2,殷少輝1
    2019年第10期
    摘要
    引用本文
    摘 要:研究了預養時間對摻與不摻防凍劑的C30、C40、C50、C60強度等級負溫混凝土抗壓強度的影響規律,得出了混凝土的受凍臨界強度和相應預養時間。試驗結果表明,受凍臨界強度隨混凝土強度等級的提高而提高;無論是摻加無機防凍劑還是有機防凍劑,均可以降低混凝土受凍臨界強度、縮短混凝土達到受凍臨界強度所需的預養時間,對C30、C40混凝土的作用效果尤為明顯。 Abstract: In this paper, the influence law of pre-curing time on the compressive strength of subzero-temperature concrete whose strength grades are C30, C40, C50 and C60 with or without antifreeze was studied. The critical freezing strengths of concrete and the corresponding pre-curing time were obtained. The test results show that the critical freezing strength increases with the increase of concrete strength grades. Whether it is added with inorganic antifreeze or organic antifreeze, it can reduce the critical freezing strengths of concrete and shorten the pre-curing time of concrete that reaches the critical freezing strength, the effect of pre-curing time on C30 and C40 concrete is particularly obvious.
    江守恒,董淑慧,朱衛中,等.基于抗壓強度的負溫混凝土受凍臨界強度研究[J].混凝土與水泥制品,2019(10):24-26. JIANG S H,DONG S H,ZHU W Z,et al.Research on the Critical Freezing Strengths of Subzero-temperature Concrete Based on Compressive Strength[J].China Concrete and Cement Products,2019(10):24-26.
    實際埋置條件下斷絲對PCCP內水壓承載能力影響研究
    實際埋置條件下斷絲對PCCP內水壓承載能力影響研究
    • 胡少偉1,2,盧 勇1,孫岳陽3,黃逸群3
    2019年第10期
    摘要
    引用本文
    摘?要:針對某輸調水工程在役超大口徑PCCP斷絲問題,建立有限元分析模型,探究了管身中部預應力鋼絲發生不同比例斷絲時的管道各部位受力狀態。結果表明,隨著內水壓的增大,斷絲管都是管腰處斷絲區域外的砂漿保護層最先進入塑性,然后是管芯的頂部、底部和管頂管底的鋼筒,最終管腰處預應力鋼絲達到其抗拉強度,整管破壞。隨著管身中部斷絲比例的增加,鋼筒和預應力鋼絲進入塑性階段時所對應的內水壓值逐漸減小,鋼筒總是先于預應力鋼絲進入塑性階段。砂漿保護層和管芯在一定斷絲比例之后進入塑性階段所對應的內水壓值維持在一個穩定的數值。研究結果可為實際工程中PCCP出現斷絲安全風險后的結構承載能力評估提供依據。Abstract:AimingattheproblemofbrokenwiresofsuperlargediameterPCCPinserviceinawatertransferproject,thefiniteelementanalysismodelisestablishedtoexplorethestressstateofeachpartofthepipewhentheprestressedsteelwirebreaksindifferentproportionsinthemiddleofthepipe.Theconclusionisasfollows:withtheincreaseofinternalwaterpressure,forthebrokenwirepipe,themortarprotectivelayeroutsidethebrokenwireareaatthewaistofthepipeenterstheplasticstagefirst,thenthetopandbottomofconcretecoreandsteeltube,finallytheprestressedsteelwireatthewaistreachesitstensilestrength,andthewholepipeisdestroyed.Withtheincreaseoftheproportionofbrokenwireinthemiddleofpipe,theinternalwaterpressureofsteeltubeandprestressedsteelwiredecreasesgraduallywhentheyentertheplasticstage,andthesteeltubealwaysenterstheplasticstagebeforetheprestressedsteelwire.Afteracertainproportionofbrokenwires,theinternalwaterpressureofthemortarprotectivelayerandthepipecorewhentheyentertheplasticstagemaintainsastablevalue.TheresearchresultscanprovideabasisforthestructuralbearingcapacityevaluationofPCCPaftertheoccurrenceofsafetyriskofbrokenwiresinpracticalprojects.
    胡少偉,盧勇,孫岳陽,等.實際埋置條件下斷絲對PCCP內水壓承載能力影響研究[J].混凝土與水泥制品,2019(10):27-30. HU S W,LU Y,SUN Y Y,et al.Study on the Influence of Broken Wires on the Internal Water Pressure Bearing Capacity of PCCP under Actual Embedded Conditions[J].China Concrete and Cement Products,2019(10):27-30.
    外加劑及其復合使用對蒸養混凝土制品強度的影響
    外加劑及其復合使用對蒸養混凝土制品強度的影響
    • 張 耀1,2,滿高鵬3,李俊成2
    2019年第10期
    摘要
    引用本文
    摘 要:以礦粉、粉煤灰、硅灰為礦物摻合料,硫酸鈉、甲酸鈉、硫氰酸鈉和自配化學純為早強劑,檸檬酸、酒石酸為緩凝劑,研究了單一礦物外加劑及復配對蒸養砂漿脫模強度的增強效果,確定了優化的膠凝體系。以復合膠凝體系為基準摻入單一化學外加劑,確定了具有良好增強效果的外加劑復配優化方案,并分析了其作用機理。
    張耀,滿高鵬,李俊成.外加劑及其復合使用對蒸養混凝土制品強度的影響[J].混凝土與水泥制品,2019(10):31-36. ZHANG Y,MAN G P,LI J C.Effects of Admixtures and Their Combination on Strength of Steam-cured Concrete[J].China Concrete and Cement Products,2019(10):31-36.
    免蒸壓無石棉纖維增強水泥板生產工藝探討
    免蒸壓無石棉纖維增強水泥板生產工藝探討
    • 徐定豐
    2019年第10期
    摘要
    引用本文
    摘 要:探討了原材料、生產裝備、工藝路線對免蒸壓無石棉纖維增強水泥板生產工藝的影響,以期找到最經濟合理的生產工藝,為相關企業提供參考借鑒。 Abstract: The production process of steam-free fiber reinforced cement board from the aspects of raw material selection, equipment selection, process design and physical properties, which can provide a reference for the ralated enterprise.
    徐定豐.免蒸壓無石棉纖維增強水泥板生產工藝探討[J].混凝土與水泥制品,2019(10):37-39. XU D F.Discussion on Production Process of Steam-free Fiber Reinforced Cement Board[J].China Concrete and Cement Products,2019(10):37-39.
    不同短切纖維對高強透水混凝土性能的影響
    不同短切纖維對高強透水混凝土性能的影響
    • 許 耀,吳 慶,史文浩,陳 偉,杜 輝,王 剛,王石林
    2019年第10期
    摘要
    引用本文
    摘 要:研究了改性聚丙烯纖維(MPPF)、玄武巖纖維(BF)、仿鋼纖維(ISF)以及MPPF的摻量、長度對高強透水混凝土孔隙率、透水系數、抗壓強度和抗折強度的影響規律,并與空白組進行了對比。結果表明,摻入不同種類的短切纖維,對高強透水混凝土抗壓強度影響不明顯,對抗折強度改善效果更為明顯,且MPPF改善效果最優;隨著MPPF摻入長度的增加,抗壓強度先增大后減小,與空白組相比,摻入短切纖維均使得孔隙率和透水系數下降,且透水系數更為敏感;當MPPF摻量為1 kg/m3,長度為18 mm時,透水混凝土可以滿足主要機動車路面的應用要求。 Abstract: In order to study the influence of different kinds of fibers on the mechanical properties of pervious concrete, the effects of the content and length of polypropylene fiber(MPPF), basalt fiber(BF), and steel fiber(ISF) on the porosity, permeability coefficient, compressive strength and flexural strength of high-strength pervious concrete were investigated. The results show that adding different kinds of short-cut fibers has no obvious influence on the compressive strength of high strength pervious concrete, and the improvement effect of flexural strength is more obvious, among which MPPF has the best improvement effect. With the increase of the incorporation length of MPPF, the compressive strength first increases and then decreases. Compared with the blank group, the incorporation of short cut fiber reduces the porosity and permeability coefficient, and the permeability coefficient is more sensitive. When the content of MPPF is 1 kg/m3, the length of the permeable concrete is 18 mm, which can meet the application requirements of main motor vehicle pavement.
    許耀,吳慶,史文浩,等.不同短切纖維對高強透水混凝土性能的影響[J].混凝土與水泥制品,2019(10):40-43. XU Y,WU Q,SHI W H,et al.Effects of Different Chopped Fibers on Properties of the High Strength Pervious Concrete[J].China Concrete and Cement Products,2019(10):40-43.
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