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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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    第二期

    水泥凈漿流動度試驗的流體靜力學理論分析
    水泥凈漿流動度試驗的流體靜力學理論分析
    • 王衍偉1,張倩倩1,冉千平1,劉加平2
    2018年第2期
    摘要
    引用本文
    摘 要:從流體力學的角度對水泥凈漿流動度試驗開展研究,在考慮流體表面張力和表面浸潤性的情況下,對流體屈服應力和流動度之間的關系開展了較文獻中現有結果更為嚴格的理論分析,獲得了一組新的公式,完善了Roussel等人的理論工作。在此基礎上,定量計算了表面張力和浸潤性、截錐圓模容積、漿體密度對屈服應力和流動度之間關系的影響。 Abstract: The mini-conical slump flow test, also known as the fluidity test, is one of the most common methods for quality control in characterizing cement pastes and grouts and for a quick evaluation of the performance of chemical admixtures. There have already been many research efforts to relate the final spread of the slumped paste to its yield stress, with maybe the most convincing one being the theoretical work of Roussel et al., where analytical expressions were derived based on hydrostatic considerations, with the influences of surface tension and wettability accounted for by a fitting parameter. Here, a more rigorous theoretical treatment of the effects of surface tension and wettability is repored. A set of equations for the relation between final spread and yield stress, with no physical ambiguous fitting parameters, are derived. The results are compared with those of Roussel et al., and the influences of surface tension and wettability, sample volume, and paste density are studied within this theoretical framework.
    王衍偉,張倩倩,冉千平,等.水泥凈漿流動度試驗的流體靜力學理論分析[J].混凝土與水泥制品,2018(2):1-6. WANG Y W,ZHANG Q Q,RAN Q P,et al.Theoretical Analysis on Hydrostatics of Cement Paste Fluidity Test[J].China Concrete and Cement Products,2018(2):1-6.
    混凝土界面過渡區(ITZ)微觀特性研究進展
    混凝土界面過渡區(ITZ)微觀特性研究進展
    • 歐陽利軍1,安子文1,楊偉濤1,丁 斌2,鎮 斌1
    2018年第2期
    摘要
    引用本文
    摘 要:總結了混凝土界面過渡區的主要形成機制、微觀特性和影響界面過渡區性能的主要因素等方面的研究成果,歸納了界面過渡區厚度、微觀硬度、孔隙率和孔隙分布狀態、水泥水化產物、氫氧化鈣晶向指數、未水化水泥含量和微裂縫密度等參數對混凝土界面過渡區特性的影響,指出了當前混凝土界面過渡區微觀特性方面需深入研究的方向。 Abstract:The main formation mechanism and microstructure characteristics of the interfacial transition zone in normal temperature concrete which studied both at home and abroad are reviewed. The effects of microstructure thickness, micro hardness, porosity, distribution of pores, cement hydration products, orientation index of calcium hydroxide, unhydrated cement content and micro-crack density on the properties of interfacial transition zone of concrete are concluded. Finally, the future research directions of the interfacial transition zone in concrete are pointed out.
    歐陽利軍,安子文,楊偉濤,等.混凝土界面過渡區(ITZ)微觀特性研究進展[J].混凝土與水泥制品,2018(2):7-12. OUYANG L J,AN Z W,YANG W T,et al.Research Progress on Microstructure Characteristic of Interface Transition Zone of Concrete[J].China Concrete and Cement Products,2018(2):7-12.
    高吸水性樹脂對水泥漿體電阻率與自收縮的影響
    高吸水性樹脂對水泥漿體電阻率與自收縮的影響
    • 陳 磊1,廖宜順1,徐鵬飛1,鞠家佳 1,田 凱2
    2018年第2期
    摘要
    引用本文
    摘 要:研究了高吸水性樹脂(SAP)對硅酸鹽水泥漿體的凝結時間、抗壓強度、自收縮和電阻率的影響規律。結果表明:高吸水性樹脂能延長水泥漿體的凝結;當SAP摻量增大時,水泥漿體的抗壓強度減小,SAP摻量為0.6%的硬化水泥漿體在28d齡期時的抗壓強度為空白組的 80%;水泥漿體在7d內的自收縮隨著高吸水性樹脂摻量的增加而減小,SAP摻量為0.6%的硬化水泥漿體的自收縮減縮率達31.6%;水泥漿體電阻率在3d內隨著SAP摻量的增加而減??;早齡期水泥漿體的自收縮與電阻率呈正相關關系,根據水泥漿體的電阻率變化曲線可以預測自收縮的發展趨勢。 Abstract:The influence of super absorbent polymer (SAP) on the setting time, compressive strength, autogenous shrinkage and electrical resistivity of portland cement paste were studied. The results show that the SAP can prolong the setting time of cement paste. With the increase of SAP content, the compressive strength of cement paste decreases. The compressive strength of the sample with 0.6% SAP at the age of 28 days reaches 80% of the control group. The autogenous shrinkage of cement paste decreases with the increase of SAP in 7 days. The shrinkage-reducing ratio of the sample with 0.6% SAP can reach above 30%. The electrical resistivity of cement paste decreases with the increase of SAP. The autogenous shrinkage has a positively correlated with electrical resistivity at early age. The autogenous shrinkage development trends can be predicted by the electrical resistivity changes.
    陳磊,廖宜順,徐鵬飛,等.高吸水性樹脂對水泥漿體電阻率與自收縮的影響[J].混凝土與水泥制品,2018(2):13-16+46. CHEN L,LIAO Y S,XU P F,et al.Influence of Super Absorbent Polymer on Electrical Resistivity and Autogenous Shrinkage of Cement Paste[J].China Concrete and Cement Products,2018(2):13-16+46.
    冷卻方式對高溫后水泥石物相組成的影響
    冷卻方式對高溫后水泥石物相組成的影響
    • 韋 華1,馮小忠2,束 偉1,錢文勛1
    2018年第2期
    摘要
    引用本文
    摘?要:借助X衍射分析(XRD)及綜合熱分析(TG-DTA)技術,研究了水泥石在高溫(300~600℃)水冷后的物相組成變化。結果表明:高溫后,不同條件下的水泥石除不同程度的脫水分解外,均出現了二次水化及嚴重碳化,其碳化程度由低到高為:自然冷卻、水冷卻、水冷后靜置;破壞樣中Ca(OH)2和CaCO3質量分數受Ca(OH)2分解溫度范圍影響顯著。Abstract:Scholarshavegivenwideattentiononcoolingmethodstoheatdegradationmechanismofconcrete,butthephysicalandchemicalchangesintheprocessofwatercoolingandstandingisnotclear.Thephaseandcompositionofhardenedcementpasteathightemperature(300~600℃)afterwatercoolingunderdifferentconditionswereanalyzedbyusingX-raydiffraction(XRD)andthermoanalysistechnology(TG-DTA).Theresultsshowthat,afterthehightemperature,differenthardenedcementpasteundertheconditionhasthedifferentlevelsofdecompositionofdehydration,secondaryhydrationandseverecarbonization,andthedegreeofcarbonizationfromlowtohighasfollows:naturalcooling,watercooling,standingafterwater;themassfractionofCa(OH)2andCaCO3inthedestructivesamplehaveremarkableeffectbyCa(OH)2decompositiontemperaturerange.
    韋華,馮小忠,束偉,等.冷卻方式對高溫后水泥石物相組成的影響[J].混凝土與水泥制品,2018(2):17-21. WEI H,FENG X Z,SU W,et al.Effects of Cooling Ways on the Phase and Composition of Hardened Cement after High Temperature[J].China Concrete and Cement Products,2018(2):17-21.
    水下不分散泡沫混凝土的抗分散性能研究
    水下不分散泡沫混凝土的抗分散性能研究
    • 張勇林
    2018年第2期
    摘要
    引用本文
    摘 要:研究了水膠比、減水劑摻量、纖維素類絮凝劑摻量對水下不分散泡沫混凝土抗分散性能的影響。試驗結果表明,當水膠比為0.48、羧甲基纖維素絮凝劑和減水劑摻量分別為0.08%和0.4%時,所制備的水下不分散泡沫混凝土的流動性和抗分散性的綜合性能最佳。 Abstract: The effect of water to binder ratio, Polycarboxylate Superplasticizer and Carboxymethyl Cellulose on dispersion resistance of non-dispersible underwater foam concrete was studied. The results show that the comprehensive performance of fluidity and dispersion resistance is the best when there are 0.48W/B, 0.08% Carboxymethyl Cellulose and 0.4% Polycarboxylate Superplasticizer in the non-dispersible underwater foam concrete.
    張勇林.水下不分散泡沫混凝土的抗分散性能研究[J].混凝土與水泥制品,2018(2):22-25. ZHANG Y L.Study on Dispersion Resistance of Non-dispersible Underwater Foam Concrete[J].China Concrete and Cement Products,2018(2):22-25.
    改性碳納米管的摻入對混凝土力學性能的影響
    改性碳納米管的摻入對混凝土力學性能的影響
    • 劉洋洋1,孫 敏1,2,馮 芳1,袁 鑫1
    2018年第2期
    摘要
    引用本文
    摘 要: 采用等離子體技術對多壁碳納米管(MWCNT)進行表面改性(P-NWCNT),然后將改性后的碳納米管摻入混凝土中,制成改性碳納米管混凝土復合材料。并研究了固定水灰比的情況下,摻入改性碳納米管(P-CNT)和未改性碳納米管(CNT)對混凝土材料抗壓強度和抗裂強度的影響。結果表明,當水灰比為0.4時,等離子體碳納米管(P-CNT)的最佳摻量約為 0.3%。 Abstract: Multiwalled carbon nanotubes (MWCNT) were modified by plasma technology (P-NWCNT), and modified carbon nanotubes were mixed into concrete to make modified carbon nanotube concrete composites.The effects of modified carbon nanotubes (P-CNT) and unmodified carbon nanotubes (CNT) on compressive strength and crack strength of concrete were studied under the condition of fixed water cement ratio.The results show that when the water cement ratio is 0.4, the optimum incorporation value of the plasma carbon nanotubes (P-CNT) is about 0.3%.
    劉洋洋,孫敏,馮芳,等.改性碳納米管的摻入對混凝土力學性能的影響[J].混凝土與水泥制品,2018(2):26-30. LIU Y Y,SUN M,FENG F,et al.Influence of Modified Carbon Nanotubes on Mechanical Properties of Concrete[J].China Concrete and Cement Products,2018(2):26-30.
    關于混凝土抗凍性能兩個問題的探討
    關于混凝土抗凍性能兩個問題的探討
    • 朱新釗1,王愛勤2,張承志3
    2018年第2期
    摘要
    引用本文
    摘 要:從硬化水泥石和骨料熱膨脹系數的差異出發,根據凍融過程的溫度變化,用彈性力學方法計算了溫度變化過程中可能產生的溫度應力。根據計算結果,提出溫度應力是混凝土凍融破壞的一個重要原因。從水的凍結溫度與孔徑之間的關系以及溫度變化對所產生應力的影響兩個方面,分析了混凝土凍融試驗結果與在實際使用環境中破壞行為的差異。指出凍融試驗結果與實際情況之間的關系不僅與孔分布、硬化水泥石和骨料的彈性模量、熱膨脹系數有關,還與混凝土配合比有關。因此,提出用相同凍融循環次數時的耐凍溫度表征混凝土的抗凍性能比用相同凍融制度時的凍融循環次數更能體現混凝土的組成與結構特征。 Abstract: From the difference of the thermal expansion coefficient between hardened cement paste and aggregate, the temperature stress which may be caused in the process of temperature change is calculated by mechanics of elasticity according to the temperature change in freezing and thawing process. Based on the calculated results, the viewpoint that the temperature stress is the important reason of freezing and thawing destruction of concrete is put forward. From both of the relationship between freezing temperature and pore size and the influence of temperature change on the stress, the difference between the result of freezing and thawing test and failure behavior under in-site working condition is analyzed. It is indicated that the relationship between the result of freezing and thawing test and actual state relates to pore distribution, the elastic modulus and thermal expansion coefficient of hardened cement stone and aggregate, and mix ratio of concrete. Thus, as the characterization of frost-resisting property of concrete, the temperature of cold-resistance under same frequency of freezing and thawing cycle can reflect better the feature of the component and structure of concrete.
    朱新釗,王愛勤,張承志.關于混凝土抗凍性能兩個問題的探討[J].混凝土與水泥制品,2018(2):31-34. ZHU X Z,WANG A Q,ZHANG C Z.Discussion about Two Questions of Frost Resistance of Concrete[J].China Concrete and Cement Products,2018(2):31-34.
    軟土地基綜合管廊關鍵節點應力影響因素分析
    軟土地基綜合管廊關鍵節點應力影響因素分析
    • 劉偉華1,阿力普江·杰如拉2,李 運1,王述紅2,王鵬宇2
    2018年第2期
    摘要
    引用本文
    摘?要:以湖南益陽市水網湖區綜合管廊工程為例,結合益陽典型軟土地質條件,對綜合管廊關鍵節點的應力進行了分析?;诂F場資料,采用有限差分軟件FLAC3D進行綜合管廊及場地土體的數值模擬,在此基礎上分析了在路堤荷載及車輛荷載作用下綜合管廊埋深、溝底碎石墊層及溝背回填土密實度這三個因素對綜合管廊關鍵節點應力的影響。結果表明,綜合管廊的關鍵節點應力隨管廊埋深的增加而變大,是否設置管底碎石墊層及溝背換填土體模量對綜合管廊關鍵節點的應力變化影響不大。Abstract:TakingconstructionofutilitytunnelontheShuiwanghuareaoftheYiyangcityinHunanprovinceasastudycaseandcombinedwiththegeologicalconditionoftypicalsoftsoilintheYiyang,thestressofthekeynodesoftheutilitytunnelwasanalyzed.Basedonthefielddate,thenumericalsimulationofutilitytunnelandsitesoilwasproposedbyusingthefinitedifferencesoftwareFlac3D,andkeynodestressofutilitytunnelwasanalyzedundertheembankmentloadandvehicleloadbytakingburialdepthsofutilitytunnel,gravelcushionandthemodulusofbackfillintoconsideration.Theresultshowthatthestressofkeynodesofutilitytunnelincreaseswithincreaseofburialdepths,andwhethersettinggravelcushionundertheutilitytunnelornotandthesoilmodulushaslittleinfluenceonthevariationofstressofkeynodesofutilitytunnel.
    劉偉華,阿力普江·杰如拉,李運,等.軟土地基綜合管廊關鍵節點應力影響因素分析[J].混凝土與水泥制品,2018(2):35-38. LIU W H,JIERULA A,LI Y,et al.Analysis on Stress Effecting Factors of Key Nodes of the Utility Tunnel for Soft Soil Foundation[J].China Concrete and Cement Products,2018(2):35-38.
    預制綜合管廊接縫防水施工技術
    預制綜合管廊接縫防水施工技術
    • 夏 葵,胡 剛,侯正國,黃尚珩,楊成凱,夏 艷
    2018年第2期
    摘要
    引用本文
    摘 要:結合日月大道實際工程,闡述了預制綜合管廊接縫防水設計、施工工藝,并提出了相應的質量保證、安全保證措施。最后,與現澆管廊接縫防水進行了對比,從經濟、環保、社會角度,分析了預制綜合管廊接縫防水的效益,以促進預制綜合管廊接縫防水施工技術的發展。 Abstract: Combined with the actual engineering of Riyue Avenue, the joint waterproofing design and construction technology of the precast utility tunnel were introduced, and the corresponding quality assurance and safety assurance measures were put forward. Finally, compared with the joint waterproof of the cast-in-place utility tunnel from the economic, environmental and social points, its benefit was analyzed in order to promote the development of the joint waterproof construction technology of the precast utility tunnel.
    夏葵,胡剛,侯正國,等.預制綜合管廊接縫防水施工技術[J].混凝土與水泥制品,2018(2):39-42. XIA K,HU G,HOU Z G,et al.Construction Technology of Joint Waterproof for Precast Utility Tunnel[J].China Concrete and Cement Products,2018(2):39-42.
    盾構管片混凝土配合比優化設計與應用研究
    盾構管片混凝土配合比優化設計與應用研究
    • 郝永旺1,杜月壘2,霍曼琳2,劉學生1,姜永濤3,韓志強3
    2018年第2期
    摘要
    引用本文
    摘?要:混凝土配合比的設計方法除了行標設計規程給定的方法外,還常采用以骨料緊密堆積理論為基礎的設計方法。通過試驗,以地鐵盾構施工管片混凝土試件抗壓強度為指標,評價這兩種設計方法的優劣及在工程中的適用性。試驗結果表明,在進行混凝土配合比設計時,先通過設計規程給定方法得出初步配合比,再通過骨料緊密堆積理論設計方法進行調整,可以得到強度更穩定的混凝土配合比。Abstract:Therearetwomethodsofmixingproportiondesignincommonuse:themethodrecommendedbyspecificationandthemethodbasedonthetheoryofthemostcompactofaggregates.Inordertojudgebetweenthetwomethods,twotestsofconcretesegmentsweredesigned,whichusedstrengthascontrolindex.Theresultshowsthatinthedesignofmixproportion,theinitialdesigncanbedonebythemethodrecommendedbyspecification,andthenitcanbeadjustedbytheothermethodofthemostcompactofaggregates.Bycombiningthetwomethods,abetterconcretedesigncanbegot.
    郝永旺,杜月壘,霍曼琳,等.盾構管片混凝土配合比優化設計與應用研究[J].混凝土與水泥制品,2018(2):43-46. HAO Y W,DU Y L,HUO M L,et al.Mix Proportion Optimization Design and Application Research of Shield Segments Concrete[J].China Concrete and Cement Products,2018(2):43-46.
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