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    蘇州混凝土水泥制品研究院有限公司

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    第五期

    可溶性堿對摻不同類型聚羧酸系減水劑水泥水化進程的影響
    可溶性堿對摻不同類型聚羧酸系減水劑水泥水化進程的影響
    • 陸兵兵1,劉 瑾1,2
    2015年第5期
    摘要
    引用本文
    摘??要:研究了可溶性堿(K2CO3)對摻聚醚型聚羧酸減水劑(PC-1)和聚酯型聚羧酸減水劑(PC-2)的水泥水化熱、凝結時間的影響,并對水化產物進行了X-射線衍射分析。結果表明,在摻PC-1或PC-2的水泥中,適當增加可溶性堿含量能降低水化放熱速率以及放熱量,能明顯縮短單硫型水化硫鋁酸鈣(AFm相)的形成時間,加快水泥的水化進程。當PC-1摻量較低時,少量的可溶性堿對漿體有緩凝效應,過量(大于0.12%)則表現為促凝效應。當PC-1摻量較高(大于0.30%)時,可溶性堿對漿體表現出促凝效應;而對摻PC-2的漿體而言,增加可溶性堿含量能很大程度縮短漿體凝結時間。摻PC-1能使Ca(OH)2(CH相)含量明顯增多,可溶性堿則能進一步促進C3S和C2S的深度水化;而在摻PC-2的水泥中,增加可溶性堿含量則會減緩水泥后期水化。Abstract:Theinfluenceofsolublealkalionhydrationheatandsettingtimeofthecementmixingthepolyethertypepolycarboxylate-basedsuperplasticizer(PC-1)andthepolyestertypepolycarboxylate-based?superplasticizer(PC-2)havebeeninvestigated,andthehydrationproductsareexaminedwithX-raydiffractionanalysis.Theresultsshowthatappropriateincreasesolublealkalicanreducethehydrationexothermicrateandheat,shortentheformationtimeofAFmphase,andacceleratethehydrationprocessofcement.WhenPC-1dosageislow,aspotofsolublealkalihaveretardingeffectonpaste,butoverdoseresultedinacceleratingitssetting.WhenPC-1dosageishigh,solublealkalicanacceleratesettingofpaste,butforthepastemixedwithPC-2,increasingsolublealkalicontentcanshortenthepastesettingtimegreatly.CHphasecontentincreasedsignificantlywhenthecementmixedwithPC-1,andsolublealkalicanfurtherpromotethedepthhydrationofC3SandC2S.However,whenthecementmixedwithPC-2,increasingsolublealkalicontentcanslowdownthelatehydrationofcement.
    ?;郀t礦渣代砂混凝土凍融試驗
    ?;郀t礦渣代砂混凝土凍融試驗
    • 石東升,丁曉宇
    2015年第5期
    摘要
    引用本文
    摘 要:探討了?;郀t礦渣代砂混凝土的凍融性能。通過凍融循環試驗,用質量損失率及抗壓強度來表征?;郀t礦渣代砂混凝土的抗凍性,探索?;郀t礦渣代替天然砂作為混凝土細骨料的可行性。試驗結果表明,?;郀t礦渣混凝土的凍融特性與普通河砂混凝土相似;在相同凍融循環作用下,?;郀t礦渣混凝土抗壓強度下降幅度較普通混凝土低,即?;郀t礦渣混凝土的抗凍性優于普通混凝土。同時,對凍融循環作用后混凝土自愈性能做了試驗,結果表明經過適當養護,?;郀t礦渣混凝土與普通混凝土的抗壓強度均能提高,具有一定的“自愈”能力。 Abstract: The frost resistance performance of granulated blast furnace slag fine aggregate concrete is discussed. By the freeze-thaw cycle experiment, the frost resistance performance of the granulated blast furnace slag concrete is evaluated by the quality loss rate and the compressive strength, and it is feasible that the granulated blast furnace slag replacing natural sand as fine aggregate in concrete is explored. By the test result, the frost resistance performance of granulated blast furnace slag concrete is similar to ordinary concrete. In the same freezing and thawing cycle condition, the compressive strength of granulated blast furnace slag concrete reduces more slowly than the ordinary concrete, in another word, the frost resistance performance of granulated blast furnace slag concrete is better than ordinary concrete. Moreover, the self-healing properties of granulated blast furnace slag concrete is discussed, as experimental results, the compressive strength of granulated blast furnace slag concrete and ordinary concrete can be improved when concrete is cured in suitable condition, namely the concrete has a certain "self-healing" ability.
    采用雙摻法配制沙漠砂混凝土性能試驗研究
    采用雙摻法配制沙漠砂混凝土性能試驗研究
    • 周澤沛1,董玉文1,周小婉2,賈 瓊3,吳 祥1,宮宇生1
    2015年第5期
    摘要
    引用本文
    摘??要:運用同時摻加機制砂和高性能減水劑的“雙摻法”制備了不同強度等級的沙漠砂混凝土,分析了高性能減水劑對沙漠砂混凝土性能的影響及不同強度等級下采用雙摻法配制的沙漠砂混凝土與普通中砂混凝土坍落度及強度等性能上的區別。結果表明,高性能減水劑不僅能改善沙漠砂混凝土的和易性,且具有早強效果,并對最終強度的提高有一定幫助。雙摻法制備的沙漠砂混凝土與同配合比的普通中砂混凝土相比,坍落度相差不大,在強度方面當所配混凝土強度等級較低時,二者的抗壓強度相近;隨著混凝土強度等級的提高,沙漠砂混凝土的抗壓強度逐漸低于普通中砂混凝土。此外,與按照常規方法制備的沙漠砂混凝土相比,雙摻法制備的沙漠砂混凝土的坍落度有很大提高。Abstract:Thetesthasmadedifferentstrengthgradeconcretebyusingthedouble-admixingmethod,whichis“mixedwithhighperformancewater-reducer,mixedwithartificialsand”.Theeffectofhighperformancewater-reduceronthedesertsandconcreteisanalyzed.Thedifferencesinslumpandstrengthofthedesertsandconcretemadebyusingthedoublemixedmethodandtheordinaryconcreteatdifferentstrengthgradeareresearched.Theresultsshowthatthehighperformancewater-reducernotonlyimprovestheworkabilityofdesertsandconcrete,butalsohastheeffectofearlystrength,andevendoessomegoodtotheimprovementofultimatestrength.Comparedwiththedesertsandconcretemadebyusingthedouble-admixingmethodandtheordinarymediumsandconcrete,theslumpisclosed,andcompressivestrengthofthedesertsandconcreteandordinarymediumsandconcreteisveryclosewhenthestrengthgradeofconcreteisn’thigh.Astheconcretestrengthincreasing,thecompressivestrengthofthedesertsandconcreteislowerthanthatoftheordinarymediumsandconcretegradually.Comparedwiththedesertsandconcretemadewithdesertsandmadebyconventionalmethod,theslumpofthedesertsandconcretemadebyusingthedouble-admixingmethodisobviouslyimproved.
    短齡期老混凝土與新混凝土粘結的劈拉強度研究
    短齡期老混凝土與新混凝土粘結的劈拉強度研究
    • 史長城1,2,王大輝1,2,袁 群1,2,曹宏亮1,2,馬 瑩1,2
    2015年第5期
    摘要
    引用本文
    摘 要:實際工程新老混凝土粘接時,老混凝土齡期可能從初凝至數十年。目前,對短齡期老混凝土與新混凝土粘接劈拉強度研究較少,本文在不同界面劑、不同澆筑結合方式下研究了老混凝土齡期從初凝至28d的新老混凝土的粘結劈拉強度,發現粘結劈拉強度隨老混凝土齡期增大而減少,并逐漸趨于穩定;界面劑的使用提高了新老混凝土的粘結劈拉強度,水泥砂漿界面劑的效果略優于水泥凈漿界面劑;水平結合的劈拉強度均遠大于豎直結合的劈拉強度;在機理分析的基礎上擬合出粘結劈拉強度隨老混凝土齡期變化的公式。 Abstract: Old-concrete age of new-to-old concrete may be from initial setting to decades in the actual project. At present, studying on bond splitting strength of the new-concrete-to-short-age-old is less, considering different interface cementing agent, different combination method, the new-to-old concrete bond splitting strength rule which old-concrete age from initial setting to 28d is studied in this paper, and it is found that bond splitting strength increases with old-concrete age decreasing, and then gradually stabilized. The splitting strength of new old concrete bond can be improved though using interface cementing agent, mortar interface cementing agent is slightly better than that of cement paste interface cementing agent. The splitting strength of level combination is far greater than vertical combination. Based on mechanism analysis, the bond splitting strength with old-concrete age changing formula is fitted.
    硬化水泥漿體粉用作混凝土摻合料的試驗研究
    硬化水泥漿體粉用作混凝土摻合料的試驗研究
    • 張日華
    2015年第5期
    摘要
    引用本文
    摘 要:通過開發一種廢棄混凝土的分離、篩分裝置,對廢棄混凝土進行有效的分離與篩分,得到粗、細骨料以及硬化水泥漿體混合料等三種材料。對該混合料進行磨細處理,用于預拌混凝土的摻合料,在與粉煤灰相同摻量的條件下,檢測混凝土的相關性能,試驗結果表明,硬化水泥漿體混合料細粉可用作混凝土摻合料。 Abstract: By developing a waste concrete separating and screening equipment, the waste concrete is separated and screened effectively to obtain three kinds of materials such as the coarse aggregates, the fine aggregates and the hardened cement paste mixture. Under the condition that the ground hardened cement paste mixture as the ready-mixed concrete admixture is mixed with the equal amount of fly ash, the relative properties of the concrete are tested. The experimental result shows that the hardened cement paste mixture powder can be used as the concrete admixture.
    石粉特性對砂漿性能的影響研究
    石粉特性對砂漿性能的影響研究
    • 孫 燁
    2015年第5期
    摘要
    引用本文
    摘??要:研究了石灰石粉比表面積(200~800m2/kg)、MB值對砂漿力學性能、耐久性能、孔隙率等的影響,以及花崗巖、石灰巖、砂巖、輝綠巖石粉(比表面積400m2/kg)對砂漿力學性能、耐久性能的影響。結果表明:石灰石粉比表面積增大時,砂漿總孔隙率、細毛細孔孔隙率、各個齡期收縮率呈降低趨勢,對砂漿氣孔及粗毛細孔孔隙率、28d抗壓強度、抗凍性能基本無影響;隨著石粉MB值的增大,試樣的抗氯離子滲透性、抗凍性、抗干縮性呈現降低趨勢,抗壓強度呈現先上升后降低趨勢,在石粉MB值為10左右時達到最大;摻入四種巖性石粉后,試樣的力學性能及耐久性能由好至差的基本順序為:石灰巖>輝綠巖、花崗巖>砂巖。Abstract:Theeffectsofspecificsurfacearea(200~800m2/kg)andMBoflimestonepowderonthemechanicalproperty,durability,porosityofmortar,andtheinfluenceofgranite,limestone,sandstone,diabasepowder(specificsurfacearea400m2/kg)onthemechanicalproperty,durabilityofmortarwerestudied.Theresultsshowthatthetotalporosity,fineporeporosityandeachageshrinkagerateofmortarshowdecreasingtrendwiththeincreaseofthelimestonepowderspecificsurfacearea.However,theporosityandcoarseporesporosity,compressivestrength(28d),frostresistancehavenochange.WiththeincreaseoftheMBvalueoflimestonepowder,theresistancetochlorideionpermeability,frostresistance,dryshrinkageresistanceshowdecreasingtrend,andthecompressivestrengthincreasesfirstandthendecreases.WhentheMBvalueisabout10,thecompressivestrengthreachesthemaximum;whenaddingthefourkindsoflithologypowderrespectively,thesequenceofthebettercompressivestrengthanddurabilityis:limestone>sandstone,granite>diabase.
    高性能膨脹劑在蘇州汾湖理想城工程中的應用
    高性能膨脹劑在蘇州汾湖理想城工程中的應用
    • 王德民1,張官學2,侯維紅1,熊晨輝1
    2015年第5期
    摘要
    引用本文
    摘??要:介紹了蘇州汾湖理想城地下工程中,底板和側墻采用了高性能膨脹劑配制的補償收縮混凝土,提高了結構整體的抗裂、防水效果。經過混凝土原材料選擇、配合比和限制膨脹率設計、現場施工控制和混凝土養護等一系列措施可知,使本工程中補償收縮混凝土產生體積膨脹的膨脹源主要為氫氧化鈣和鈣礬石;當高性能膨脹劑摻量在35~45kg/m3時,其配制的補償收縮混凝土的限制膨脹率可達3.0×10-4~4.5×10-4,能夠有效補償混凝土的收縮;為保證其膨脹性能的有效發揮,必須采取相應的施工控制和混凝土養護措施。Abstract:Shrinkage-compensatingconcretepreparedbyexpansiveagent,wasusedinslabandwallofSuzhouFenLakeLixiangCityproject,andcrack-freeandwaterproofundergroundstructureshavebeensuccessfullybuilt.Fromthepracticeandexperiencesofrawmaterialsselection,mixdesignandrestraintedexpansionratetesting,aswellasfieldconstructioncontrolandconcretecuring,etc,itwasconcludedthatcalciumhydroxideandettringitewerethemainexpansionsourceofshrinkage-compensatingconcreteusedintheproject.Additionofexpansiveagentwas35~45kg/m3couldgeneratetherestraintedexpansionrateinrangeof3.0×10-4~4.5×10-4,effectivelycompensatetheshrinkageofconcrete.Theexecutionoffieldconstructioncontrolandconcretecuringiscriticaltoobtaintheexpansionpropertyofexpansiveagent.
    2014年江蘇省環形混凝土電桿產品質量安全風險監測分析
    2014年江蘇省環形混凝土電桿產品質量安全風險監測分析
    • 湯文友1,談永泉2
    2015年第5期
    摘要
    引用本文
    摘 要:概述了我國環形混凝土電桿的行業現狀及2014年江蘇省環形混凝土電桿產品質量的檢測情況,分析了產品風險檢測結果,并提出了提高產品質量的措施和建議。 Abstract:The present industry status of circular concrete pole in China and product quality inspection situation of circular concrete poles from Jiangsu province in 2014 are summarized, the risk monitoring results are analyzed, and some measures and suggestions are put forward to improve the quality of products.
    有砟軌枕生產線優化改造為雙塊式軌枕生產線的途徑
    有砟軌枕生產線優化改造為雙塊式軌枕生產線的途徑
    • 鄭愛國,康祥梅
    2015年第5期
    摘要
    引用本文
    摘 要:在滿足雙塊式軌枕生產工藝要求的前提下,將有砟軌枕生產線改造為無砟雙塊式軌枕生產線,并對布料振動成型、脫模、成品堆碼等工藝進行了論述,對既有軌枕生產線的改造有一定的借鑒作用。 Abstract: Double-block sleeper with its comfort, strong integrity, good performance, the geometry of lasting long service life and so on, has been widely used in China, and its production becomes more and more concerned. In order to meet the requirements of double-block sleeper production process, the method for transform the ballasted sleeper production line into double-block sleeper production line is put forward. The vibration moulding, demoulding cloth, finished stacking process is discussed, which plays a positive role for the existing sleeper production line transformation.
    混凝土T形梁預應力損失及預應力鋼筋應力增量分析
    混凝土T形梁預應力損失及預應力鋼筋應力增量分析
    • 戎 賢1,2,仉慶文1,2,趙玉婷1,2
    2015年第5期
    摘要
    引用本文
    摘 要:選取某大橋有粘結預應力鋼筋混凝土T形梁作為試驗梁,在跨中進行集中力分級加載,預應力鋼筋應力增量由錨具和預應力鋼筋與注漿之間的粘結力共同傳遞給混凝土,分析了二者承擔的比例及該梁的預應力損失。研究發現,在分級加載過程中,應力增量主要是由預應力鋼筋與注漿之間的粘結力傳遞給混凝土,由錨具承擔的部分可以忽略不計。并將該梁預應力損失的理論值與實測值進行比較,得出理論值與實測值的比值在1.52左右,說明規范中規定的曲線有粘結預應力筋預應力損失的計算公式偏于保守。 Abstract: Choosing a bonded prestressed reinforced concrete T-shaped beam from some bridge as the test beam, the single force is exerted on the mid span of the beam by gradation loading. The stress increment of prestressed steel is transmitted by the anchor device and the binding power between the prestressed steel and the cement paste.The force sharing ratio of the prestressed steel and the cement paste and prestressing loss of the beam are analyzed.It's found that during the loading process, the stress increment is mainly transmitted by the binding power, and the bearing part of anchor device can be ignored. Theoretical value and measured value of the prestressing loss are compared. The results show that the ratio of the theoretical value and measured value is about 1.52, which means the specified computational formula about prestressing loss of the bonded curved presstressed steel is conservative.
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