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    蘇州混凝土水泥制品研究院有限公司

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    第十期

    污泥基生態混凝土的制備
    污泥基生態混凝土的制備
    • 王 可1,王 巖1,代群威1,2,雷 建1,羅偉恢1
    2016年第10期
    摘要
    引用本文
    摘??要:對3根截面尺寸與縱向受力鋼筋配置相同但兩端箍筋配置不同的鋼筋混凝土柱進行地震模擬試驗,研究了鋼筋混凝土柱在地震作用下,柱端端部或柱端腹部箍筋進行加密對柱水平承載力、柱端縱向受力鋼筋變形及裂縫產生的影響。試驗結果表明:對柱端端部箍筋加密,可以提高鋼筋混凝土柱的水平承載力;在轉角?覫=1/33范圍內反復荷載作用下,對柱端端部箍筋加密,可以提高鋼筋混凝土柱的整體強度;在轉角=1/50范圍內,鋼筋混凝土柱在持續反復荷載作用下,對鋼筋混凝土柱端某一部位的箍筋加密,可以減小反復荷載作用對該部位的縱向受力鋼筋變形;對鋼筋混凝土柱端箍筋加密,對混凝土柱受壓區的裂縫產生沒有太大影響,但可以減小受拉區箍筋加密區域的裂縫生長。Abstract:Tostudytheeffectonthelongitudinalreinforcementdeformationofcolumnend,andthecrackdistributionandcolumnhorizontalbearingcapacitybythestirrupconfiningmethodintheregionofcolumnendoritsmiddlepart,3reinforcedconcretecolumnspecimens,whichhavethesamesectionsizeandlongitudinalreinforcementratiobutwiththedifferentstirrupsconfiguration,weretestedforearthquakesimulation.Theresearchresultsshowthatstirrupconfiningmethodatthecolumnendcanimprovethecolumnhorizontalbearingcapacity,andalsocanimprovetheoverallbearingcapacityofcolumnunderthecirclingloadingattherangearoundangle=1/33,andcandecreasethelongitudinalreinforcementdeformationwhenstirrupconfiningfocusonaparticularcolumnendattherangearoundangle?覫=1/50;ithasnoobviouseffectonthecrackgenerationintheconcretecolumncompressionzone,butcanrestrictthecrackgrowthinthestirrupconfiningtensionregions.
    等強度條件下粉煤灰摻量對混凝土抗裂性的影響
    等強度條件下粉煤灰摻量對混凝土抗裂性的影響
    • 寧逢偉,陳 波,王子龍,張 豐
    2016年第10期
    摘要
    引用本文
    摘 要:為考察等強度條件下粉煤灰摻量對混凝土抗裂性的影響,通過調整水膠比對15%、20%、25%三種粉煤灰摻量的混凝土進行了等強度設計,并在此基礎上開展了膠凝材料水化熱及混凝土極限拉伸值、干縮、自生體積變形等熱學性能和變形性能測試。結果表明,通過調整水膠比得到的三種粉煤灰混凝土的抗壓強度、軸向抗拉強度和抗拉彈性模量基本相當,實現了等強度設計;等強度條件下粉煤灰摻量提高,混凝土的極限拉伸值增加,干縮值降低,自生體積收縮變形減少,開裂敏感性降低;三種混凝土之間的絕熱溫升差異小于膠凝材料水化熱的測試情況,說明孤立地由膠凝材料水化熱來評價混凝土的抗溫度應力開裂性能是不合適的。 Abstract: To evaluate the influence of content of fly ash on crack resistance of concrete under the condition of equivalent strength, three kinds of concrete respectively with fly ash content of 15%、20% and 25% were equivalent strength designed by adjusting water-binder ratio, and the hydration heat of cementitious material, ultimate tension, drying shrinkage, autogenous volume deformation of concrete were tested. The results indicate that compressive strength, axial tensile strength, tensile elastic modulus of these three concretes are almost the same, and the design of equivalent strength is realized. When the content of fly ash is increased, concrete has larger ultimate tension, lower dry shrinkage, less shrinkage of autogenous volume deformation and lower cracking sensitivity. The differences of adiabatic temperature rise among three concretes are less than that of the results coming from hydration heat of cementitious materials, which prove that evaluating crack resistance of temperature stress of concrete only by hydration heat of cementitious materials is unsuitable.
    基于滲透試驗的離子導電砂漿工藝優化研究
    基于滲透試驗的離子導電砂漿工藝優化研究
    • 范道波1,2,3,4,趙若紅1,2,3,4,徐 安1,2,3,4,羅 寶1,2,3,4
    2016年第10期
    摘要
    引用本文
    摘 要:通過對離子導電砂漿試件進行滲透性能試驗和截面微觀形貌的研究,對其制備工藝進行了優化。試驗結果表明,在能滿足離子導電砂漿電學性能要求時,電解質溶液濃度不宜太大,不同電解質溶液的最佳濃度要通過試驗確定。通過分析不同齡期和不同水灰比試件的滲透試驗結果,并結合掃描電鏡對試件截面形貌觀測數據,得到制備離子導電砂漿試件的最優選擇是養護28d且水灰比為0.7的試件,同時不需要考慮試件初始電阻率值的大小。 Abstract: The process optimization of ion-conductive mortar (ICM) is studied by permeability test and observation ofsection micro-topography. The experimental results show that the concentration of electrolyte solution should not be too high when the electrical properties of ICM are met. The concentration of different electrolyte solution should be determined by test. Through analyzing results of permeability test that using specimens with different curing time and water cement ratio, and combining with the observation data of section micro-topography using scanning electron microscope, the optimal choice of making ICM is the specimens curing 28d with water cement ratio equaling to 0.7. Meanwhile, the influence of specimens’ initial resistance value when making ICM can be neglected.
    基于吸水動力學法研究砂漿孔結構對其力學性能與軟化系數的影響
    基于吸水動力學法研究砂漿孔結構對其力學性能與軟化系數的影響
    • 陳 景,蘭 聰,劉永道,王晶晶,向衛平
    2016年第10期
    摘要
    引用本文
    摘??要:通過在砂漿中摻入不同的砂漿改性劑,研究了改性劑對濕拌砂漿力學性能的影響;并采用吸水動力學法測定了砂漿的孔結構參數(孔均勻性系數、平均孔徑以及孔結構綜合因素),研究了砂漿孔結構參數對其力學性能和軟化系數的影響。研究表明,砂漿改性劑對不同膠凝體系的影響存在差異,在礦粉體系中,能對其抗壓強度提高20%~25%;砂漿抗壓強度與孔結構綜合因素符合指數函數關系;砂漿軟化系數與孔結構綜合因素無相關性;圖形二值化分析驗證解釋了試驗結果,并與分析結果相符。Abstract:Theinfluenceofthemortarmodifieronthemechanicalpropertyoftheready-mixedmortarwasstudiedthroughmixedwithdifferentmodifierinthemortar.Andtheporestructureparameters(homogeneityoftheporestructure,averagediameteroftheporestructureandthecomprehensivefactorsoftheporestructure)weretestedbytheabsorptionkineticmethodtostudytheinfluenceoftheporestructureonthemechanicalandthesoftencoefficientofmortar.Testingresultsshowthatmortarmodifierhaddifferentfunctionsindifferentgelsystem,thecompressivestrengthwasincreased20%~25%withthemodifierinthecement-slagpowdersystem.Mortarcompressivestrengthandthecomprehensivefactorsporestructurewereinaccordancewithexponentialfunctionrelationship,andmortarsofteningcoefficientofnocorrelationwiththecomprehensivefactorsporestructure.Graphicanalysis,binaryvalidationexplainstheexperimentalresults,anditisconsistenttotheresultsoftheanalysis
    大摻量磨細礦粉膠凝體系抗硫酸鹽侵蝕的研究
    大摻量磨細礦粉膠凝體系抗硫酸鹽侵蝕的研究
    • 王 冬1,2,黃國泓1,2,祝燁然1,2
    2016年第10期
    摘要
    引用本文
    摘 要:為考察大摻量磨細礦粉膠凝體系對抗硫酸鹽侵蝕性能的影響,研究了不同品種、摻量及經體積穩定劑改性處理后磨細礦粉對抗硫酸鹽侵蝕性能的影響。結果表明,不同廠家的S95級磨細礦粉對抗硫酸鹽侵蝕作用的影響相近;磨細礦粉摻至50%及以上其抗蝕系數高于抗硫酸鹽水泥,70%摻量的磨細礦粉膠凝體系硫酸鹽侵蝕膨脹率較空白組下降81%;經體積穩定劑改性處理后磨細礦粉抗硫酸鹽侵蝕性能進一步提高。 Abstract: To examine impacting of sulfate attack resistance of large amounts of ground slag gelling system,the effects of the different varieties, dosage and after volume stabilizer modification treatment ground slag on sulfate attack resistance are studied. It is shown that the sulfate attack resistant property of different manufacturer S95 ground slag has the same effect. When the amount of ground slag is no less than 50%, its sulfate attack resistance is higher than the sulfate cement, 70% amounts of ground slag gelling system of sulfate attack rate fell by 81%. Ground slag after volume stabilizer modification treatment is better on sulfate attack resistance.
    清水混凝土概念、研究現狀、存在問題及配合比設計方法綜述
    清水混凝土概念、研究現狀、存在問題及配合比設計方法綜述
    • 郭 偉1,路林海2,王龍志3,崔 鑫3,王桂玲4,張海霞3
    2016年第10期
    摘要
    引用本文
    摘 要:20世紀90年代后期以來,清水混凝土研究及工程應用得到了長足發展,許多城市建成了清水混凝土標志性工程。為了更好地促進清水混凝土研究的深入、工程質量的提高,對清水混凝土的概念、研究現狀、存在問題及現有的清水混凝土配合比設計方法進行了系統地梳理、總結。通過對清水混凝土現狀的研究,可使相關領域技術人員認識到清水混凝土發展中存在的不足、明確清水混凝土的研究方向,以實現清水混凝土技術研究水平的再提高,有力地支持清水混凝土工程應用的進一步推廣。 Abstract: Since the late 1990s, research and application of fair-faced concrete has made considerable progress, many cities built landmark projects of fair-faced concrete. In order to better promote the study in-depth and the engineering quality improvement of fair-faced concrete, the concept, research status, existing problems and mixture design methods of fair-faced concrete are systematically reviewed and summarized. Through the above study of fair-faced concrete, the relevant technicians recognize the lack of fair-faced concrete in the development and realize a clear research direction, in order to improve research level, strongly support further promotion of fair-faced concrete in engineering applications.
    C50機制砂混凝土早期收縮抗裂性能試驗研究
    C50機制砂混凝土早期收縮抗裂性能試驗研究
    • 李 潛
    2016年第10期
    摘要
    引用本文
    摘??要:針對橋梁高性能混凝土開裂問題,通過力學性能、收縮以及早期開裂等試驗方法,研究了C50機制砂混凝土的早期收縮抗裂性能。試驗結果表明,礦渣粉增大了機制砂混凝土早期開裂的風險;摻加4%~6%的膨脹劑能有效抑制混凝土早期收縮,提高混凝土早期抗裂能力;摻加0.1%的SAP也能降低混凝土收縮,提高其早期抗裂性能。Abstract:Focusingoncrackproblemsofbridgehighperformanceconcrete,theearlyageshrinkagecrackingresistanceofC50machine-madesandconcretewasstudiedusingmechanicalproperties,shrinkageandcracktestingmethods.Testresultsshowedthattheslagpowderincreasestheriskofmachine-madesandconcrete’searlycracking.Mixing4%~6%expansionadmixturecandiminishtheearlyshrinkageofconcreteandimprovetheearlycrackresistanceperformanceofconcrete.Mixing0.1%SAPcanreduceshrinkageofconcreteandimprovetheearlycrackresistanceperformanceofconcrete.
    預制預應力混凝土箱涵的研制及其應用前景
    預制預應力混凝土箱涵的研制及其應用前景
    • 李全民1,顏成文1,丁怡潔2
    2016年第10期
    摘要
    引用本文
    摘 要:介紹了適合工廠化生產的先張法預制預應力混凝土箱涵的結構、性能特點、生產工藝及技術優勢。與傳統制品進行對比,分析了預制預應力混凝土箱涵的經濟性和可行性,并展望了其應用前景。 Abstract: The structure, performance features, production process and technology advantage of pre-tensioning precast prestressed concrete box culvert for factory production are introduced. Compared with traditional concrete products, the economical efficiency and feasibility of the precast prestressed concrete box culvert are analysed, and its application in future is prospected.
    萘系高效減水劑在PHC管樁中的應用
    萘系高效減水劑在PHC管樁中的應用
    • 許建釗1,林炎坤2
    2016年第10期
    摘要
    引用本文
    摘 要:通過萘系高效減水劑在PHC管樁高強混凝土中的應用實踐,發現不同型號萘系高效減水劑由于各自質量的差異,對混凝土工作性能及抗壓強度的影響也各不相同。 Abstract: Based on practical application of various naphthalene-based water reducers, different influence owning to quality difference of several types of naphthalene-based water reducer on the workability and compressive strength of concrete were found.
    混雜纖維布加固損傷混凝土梁抗彎承載性能試驗研究
    混雜纖維布加固損傷混凝土梁抗彎承載性能試驗研究
    • 褚云朋,賈 彬
    2016年第10期
    摘要
    引用本文
    摘 要:對比研究了7根試驗梁(1根對比梁和6根粘貼一層混編纖維及兩層層間混雜纖維加固損傷的混凝土梁)的承載力、剛度及破壞模式。結果表明:加固后,開裂荷載、極限荷載的提高程度明顯高于屈服荷載,粘貼一層布發生適筋梁破壞,層間混雜纖維布加固試驗梁承載性能提高更為顯著,纖維布呈逐級斷裂狀態,最后發生剝離破壞;混雜纖維加固后延性也有一定改善,粘貼兩層纖維布的混凝土梁,受彎區裂縫發展密集,最后FRP布剝離破壞,建議采用兩層布時應該增加U型箍的數量,以提高抗剝離能力。 Abstract:Bearing capacity, stiffness and failure modes of a total of 7 specimens, including a comparison of the beam and 6 paste mixed fiber layer and two layers of hybrid fiber reinforced concrete beams were studied. The results show that: after strengthening, increasing levels of cracking load and ultimate load are all significantly higher than the yield load and the damage of reinforced beam with a layer of cloth occurrs; bearing capacity of interlayer hybrid fiber reinforced polymer test beam has more significant improvement, fiber cloth is progressively broken state, and stripped failure of fiber cloth occurs at last; ductility of hybrid fiber reinforced beam has a certain improvement after strengthening, cracks development of beam with two layers of fiber cloth is intensive at flexural area, and the stripped failure of the cloth FRP occurs at last. So it’s recommended that when using two layers of cloth, the number of U-shaped hoop should increase to improve anti-stripping ability.
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