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    蘇州混凝土水泥制品研究院有限公司

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    第九期

    白云石粉用作礦物摻合料對混凝土耐久性的影響
    白云石粉用作礦物摻合料對混凝土耐久性的影響
    • 賈麗莉1,高育欣1,趙日煦1,彭 園1,黃義雄1,霍 亮2
    2014年第9期
    摘要
    引用本文
    摘 要:用磨細白云石、白云石-水淬礦渣共磨物料作為混凝土礦物摻合料,研究了單摻白云石粉、白云石-水淬礦渣復合礦物摻合料對混凝土耐久性的影響。研究結果表明,單摻白云石粉使C30混凝土的電通量值增加15%,同時使碳化深度增加,并使100次凍融循環后的動彈模量損失率最大達到37.6%,弱化了混凝土的抗氯離子侵蝕性和抗碳化和抗凍性能;而單摻白云石粉使混凝土的抗硫酸鹽侵蝕系數提高1.7%,抗硫酸鹽侵蝕性能改善。白云石-水渣復合礦物摻合料與單摻白云石粉相比,改善了混凝土的抗氯離子滲透性、抗碳化、抗凍融性能;當水淬礦渣與白云石比例為3.5:6.5時,混凝土的耐久性包括抗氯離子侵蝕性、抗碳化、抗凍性能最好。 Abstract: The ground dolomite and co-grinding powders of dolomite and water-quendched granulated blost furnace slag were used as concrete admixtures, and the influence of admixture on the durability of concrete are studied. The results show that by single-mixed with dolomite powder, the electric flux of C30 concrete increase by 15%, the carbonation depth increase, and the loss rate of dynamic elastic modulus can reach up to 37.6% after 100 freeze-thaw cycles, the properties of chloride ion penetration-resistant, anti-carbonization and anti-freeze of concrete are weakened; however, the sulphate resistance coefficient of concrete increase by 1.7%, the sulfate resistance is improved. Compared with single-mixed dolomite powder, mixing dolomite-slag composite mineral admixture can improve properties of chloride ion penetration-resistant, anti-carbonization and anti-freeze of concrete, especially when the ratio of slag and dolomite is 3.5∶6.5, the durability of concrete will be the best.
    廢棄混凝土對混凝土抗壓性能影響的試驗研究
    廢棄混凝土對混凝土抗壓性能影響的試驗研究
    • 張衛東1,王振波2
    2014年第9期
    摘要
    引用本文
    摘 要:通過對不同廢棄混凝土摻入率、塊體粒徑的再生混凝土立方體抗壓強度試驗,研究了兩者對立方體試件的破壞形態、抗壓強度的影響。結果表明,摻有廢棄混凝土塊體的混凝土與普通再生混凝土破壞形態不盡相同,其中摻有廢棄混凝土塊體的混凝土的破壞形態呈不規則凹凸面,脆性破壞;摻入率對抗壓強度有較大的影響;隨著摻入率的加大,立方體抗壓強度下降。通過對試驗數據的分析,驗證了現行公式,通過引入粘結力降低系數,提出了摻有廢棄混凝土塊體混凝土立方體抗壓強度的簡化計算公式。 Abstract: Based on cubic compressive strength tests of concrete with different replacement rate and size of waste concrete, the influence of the two factors on failure mode and compressive strength of concrete cubic specimen were studied. The test results demonstrate that the failure mode of recycled concrete with waste concrete blocks is different from that of common recycled concrete, and the failure mode of waste recycled concrete blocks presents irregular surface and brittle failure; the replacement rate has great influence on cube compressive strength of the concrete, cubic compressive strength declines when replacement rate inclines. Based on test results, the formula is verified, and simplified calculation formula put forward by considering reduction factor of bond force, and the calculating results agrees with test data.
    轉爐鋼渣的膠凝性能和活性激發
    轉爐鋼渣的膠凝性能和活性激發
    • 姚 翔1,林長農2,鄧 敏1,陽勇福1,曹黎穎2
    2014年第9期
    摘要
    引用本文
    摘??要:分析了轉爐鋼渣的礦物組成和膠凝性能,研究了Na2SO4、CaCl2、NaCl和海水對鋼渣漿體和鋼渣水泥漿體強度的影響。結果表明,鋼渣粉3d的水化放熱量僅為P·O42.5水泥的7.5%,鋼渣漿體7d和90d抗壓強度只有0MPa和15.1MPa,所以鋼渣粉自身水化能力很低,膠凝性很差。Na2SO4和CaCl2對于鋼渣漿體有一定的激發效果,摻0.9%Na2SO4時激發效果最好,漿體3d和90d抗壓強度比不摻激發劑的空白組提高了19.1%和8.2%。對于鋼渣水泥漿體,摻1.2%CaCl2的漿體強度最高,漿體3d和90d抗壓強度分別比空白組提高了53.6%和16.9%。NaCl和海水對鋼渣漿體和鋼渣水泥漿體3d強度有明顯的激發作用,但會使90d強度出現較明顯的倒縮。Abstract:Themineralcompositionandcementitiouspropertiesoftheconvertersteelslagareanalyzed.TheinfluenceofNa2SO4,CaCl2,NaClandseawateronthestrengthofsteelslagslurryandsteelslagcementslurryisevaluated.Theresultsshowthatthehydrationheatofsteelslagpowderisonly7.5%ofP·O42.5cementat3days,andthecompressivestrengthofsteelslagslurryis0MPaat7daysand15.1MPaat90days.Soconvertersteelslaghaslowpotentialhydraulicpropertyandpoorcementitiousactivity.Na2SO4,CaCl2,NaClandseawatermaypromotetheearlystrengthofsteelslagslurryandsteelslagcementslurry.NaNa2SO4?andCaCl2hadgoodactivationeffectsonthesteelslagslurry.CaCl2isthemosteffectiveactivatorandthecompressivestrengthofsteelslagcementslurryaddedwith1.2%CaCl2isincreasedby19.1%at3daysand8.2%at90daysrespectively.Thestrengthofsteelslagcementslurryisthehighestwhentheslurryisaddedwith1.2%CaCl2andthecompressivestrengthisincreasedby53.6%at3daysand16.9%at90daysrespectively.NaClandseawaterhavesignificantactivationonthestrengthofsteelslagslurryandsteelslagcementslurryat3days,howeverthestrengthat90daysdecreasesremarkably.
    大體積混凝土柱施工期溫度場及溫度應力分析
    大體積混凝土柱施工期溫度場及溫度應力分析
    • 李志國,邵永健
    2014年第9期
    摘要
    引用本文
    摘 要:大體積混凝土結構在施工初期容易受到自身水化熱升溫和外界環境溫度變化的影響,從而在結構內部產生溫度應力。溫度應力是大體積混凝土開裂的主要原因,為了控制混凝土溫度裂縫的發展,有必要對大體積混凝土柱施工期的溫度進行監測,進而分析其內部溫度應力變化規律?;趯嶋H工程的現場監測數據,得出大體積混凝土柱施工期的內外溫度與最大溫差變化規律,并與大型有限元軟件ANSYS模擬的施工期溫度場結果進行對比。通過計算混凝土內部的最大溫度應力,提出了大體積混凝土柱施工階段的工藝改進措施。 Abstract:Because of the influence of hydration heat temperature of cement and the external environment temperature, the temperature stress is easily occurred within the mass concrete structure at the starting stage of the construction. Temperature stress is the main reason for the mass concrete cracking, so it is necessary to monitor the temperature of mass concrete column during construction period and analyze its internal thermal stress change rule in order to control the development of concrete temperature crack. Based on some data by actual engineering field monitoring, the change rule mentioned above is concluded and compared with simulate results of temperature field by the finite element software ANSYS during the construction. In addition, according to the calculation of concrete internal maximum temperature stress, some technology improvement measures of mass concrete column are put forward during construction period.
    預應力管樁用于基坑支護的抗彎剛度分析及工程應用研究
    預應力管樁用于基坑支護的抗彎剛度分析及工程應用研究
    • 苑舉衛1,孫邦賓2,郭 彤3,姚 兵2
    2014年第9期
    摘要
    引用本文
    摘 要:預應力管樁水泥土復合擋墻支護技術(簡稱PCMW工法)采用PHC管樁作為擋土構件,其抗彎剛度的合理選取對設計結果和支護安全影響較大。本文引入剛度降低系數,通過開展PHC管樁和鉆孔樁的抗彎剛度對比分析研究,建立了面向設計的PHC管樁抗彎剛度和彎矩取值原則;結合工程實例,驗證了PHC管樁抗彎剛度計算方法的適用性。研究結果表明:由于預應力的存在,使得預應力管樁開裂后的剛度衰減速度遠低于鉆孔灌注樁;采用本文推薦的PHC管樁抗彎剛度方法得到的計算結果與基坑監測結果規律性吻合良好。 Abstract: In PCMW (Prestressed Concrete Tube-pile Soil-cement Mixed Wall), the precast tube-pile is used to withstand soil pressure, whose bending stiffness has great influence on design of supporting structure in deep excavation and deformation predication. Based on analysis of stiffness reduction coefficient between PHC pile and cast-in-place concrete pile, the result shows that prestress makes PHC pile keep relatively higher bending stiffness after cracking, which benefits for lateral deformation control of foundation pit. A successful project example of PHC pile with PCMW demonstrates the applicability of the method.
    高強箍筋約束高強混凝土軸心受壓力學性能研究
    高強箍筋約束高強混凝土軸心受壓力學性能研究
    • 楊正民,王 旭
    2014年第9期
    摘要
    引用本文
    摘 要:通過2組配置普通強度箍筋與高強度箍筋的混凝土短柱的軸心受壓試驗,研究了高強箍筋約束混凝土柱的破壞過程及其形貌,分析了箍筋強度對軸心受壓性能的影響及其作用機理。 Abstract: The axial compression experiments on two groups of concrete short columns with ordinary-strength stirrups and high-strength stirrups are carried out. Damage process and their morphology of concrete columns confined with high-strength stirrups are studied, and the influence of stirrup strength on axial compression performances of the concrete short columns and relevance mechanism are analyzed.
    鋼框架雙鋼板內填混凝土剪力墻抗震性能分析
    鋼框架雙鋼板內填混凝土剪力墻抗震性能分析
    • 朱曉蓉1,2,趙寶成1,趙書全3,徐基磊1
    2014年第9期
    摘要
    引用本文
    摘??要:應用ABAQUS有限元軟件,對鋼框架雙鋼板組合剪力墻試件進行模擬計算。通過改變結構中內填混凝土板厚度、鋼板厚度、混凝土強度及剪跨比等參數來分析結構的骨架曲線、滯回曲線和剛度退化曲線。計算結果表明:試件極限承載力受鋼板厚度以及剪跨比的影響較大,受混凝土強度等級和混凝土板厚度影響較??;試件鋼板厚度越大、剪跨比越小、混凝土板厚度增大、混凝土強度等級提高,試件的滯回曲線飽滿,耗能能力較強,抗震性能較好。Abstract:Steelframebi-steel-platecompositeshearwallsspecimensweresimulatedusingthefiniteelementsoftwareABAQUS.Theeffectsoftheinfilledconcretewallthickness,steel-platesthickness,concretestrengthandshearspanratioonthespecimenpropertieswereanalyzedbasedontheskeletoncurve,hysteresiscurveandstiffnessdegradationcurve.Theanalysisresultsshowthattheultimateloadismoreaffectedbysteel-platethicknessandshearspanratiobutlessaffectedbyconcretestrengthandconcrete-platethickness;withtheincreasingofsteel-platesthickness,concretestrengthandconcretewallthicknessandthedecreasingofshearspanratio,thehystereticcurveisfull,energydissipationcapacityisstrongandtheseismiccapacityisgreat.
    圖像法定量分析加氣混凝土晶體和膠體
    圖像法定量分析加氣混凝土晶體和膠體
    • 吳 葉,相秋迪,蔣亞清,宋 強
    2014年第9期
    摘要
    引用本文
    摘??要:水化硅酸鈣晶體和膠體是加氣混凝土的主要水化產物,晶/膠比是影響加氣混凝土強度的關鍵因素。本文通過對高性能砂加氣混凝土和粉煤灰加氣混凝土的BSE圖像進行處理,計算了兩種制品中晶體的體積率和膠體的體積率。分析結果表明,在相同的水熱合成工藝條件下,高性能砂加氣混凝土的晶體與膠體總體積率為粉煤灰加氣混凝土的1.4倍,兩種加氣混凝土的晶體/膠體體積比分別為1.7和1.2。圖像分析法提供了評價加氣混凝土水化產物的科學依據和方法。Abstract:TobermoritecrystalandC-S-Hgelaremainhydratesofaeratedconcrete(AC),andCrystal/gelratio(C/G)isoneofthekeyfactorsaffectsstrengthofAC.Here,thevolumeC/GsofACwithhighperformancesandandflyashwerecalculatedbasedontheBSEimaging.It’sindicatedthatthetotalvolumeofACwithsandis1.4timesthatofACwithflyashunderthesamehydrothermalcondition,andC/GsofthetwoACsare1.7and1.2respectively.BSEimagingprovidesascientificbasisandmethodforevaluationhydratesofAC.
    稻桿纖維對改善泡沫混凝土抗壓強度的研究
    稻桿纖維對改善泡沫混凝土抗壓強度的研究
    • 吳曉艷,劉紅飛,張 程,魏宏志,楊 揚,張國佳,陳建芳
    2014年第9期
    摘要
    引用本文
    摘 要:用化學發泡法制作了泡沫混凝土,并對稻桿纖維對泡沫混凝土抗壓強度的影響進行了試驗研究。通過對不同纖維直徑、長度和摻量的組合試驗,確定了最佳秸稈參數組合和最主要的影響因素,并分析了各個因素的影響作用。 Abstract: The foam concrete block is produced by chemical foaming method, and the influences of rice straw fiber on compressive strength of the foam concrete are studied. By the orthogonal test with different combinations of fiber diameter, length and volume, the best parameters and the main influencing factors are determined, and the effect of each factor on the concrete properties is analyzed.
    玻璃纖維增強輕骨料混凝土力學性能及疲勞損傷研究
    玻璃纖維增強輕骨料混凝土力學性能及疲勞損傷研究
    • 吳 鵬1,李 璐2
    2014年第9期
    摘要
    引用本文
    摘 要:通過室內試驗研究了玻璃纖維摻量對輕骨料混凝土抗壓強度、劈裂抗拉強度、抗折強度等力學性能,以及玻璃纖維摻量和應力比對輕骨料混凝土疲勞壽命的影響。試驗結果表明:玻璃纖維的加入在一定程度上雖然降低了輕骨料混凝土的抗壓強度,但使抗折強度和折壓比顯著增大,明顯改善了輕骨料混凝土的彎曲韌性;輕骨料混凝土的劈裂抗拉強度隨玻璃纖維摻量的增大呈現先增大后減小規律,當玻璃摻量為1.5時,劈裂抗拉強度達到最大值。同一應力比下,玻璃纖維摻量越大輕骨料混凝土的疲勞壽命越長;當玻璃纖維摻量相同時,應力比越大,輕骨料混凝土的疲勞壽命越短;隨著玻璃纖維摻量的增多,疲勞方程的斜率和截距都逐漸增大,表明疲勞壽命對應力比的敏感性逐漸增大。 Abstract: The effects of glass fiber content on the compressive strength, splitting tensile strength, lexural strength and other mechanical properties of lightweight aggregate concrete, and the effects of glass fiber content and stress ratio on the fatigue life of lightweight aggregate concrete are study based on the indoor test. The test results show that adding glass fibers reduces the compressive strength of lightweight aggregate concrete in a certain extent, but the flexural strength and fracture pressure ratio increase significantly, and the flexural toughness of the lightweight aggregate concrete is improved significantly. With the increasing of glass fiber content,the splitting tensile strength of lightweight aggregate concrete increases at first and then decreases, while the glass content is 1.5, and the splitting tensile strength can reach the maximum value. When the stress ratio is same,the larger glass fiber content, the longer fatigue life of lightweight aggregate concrete, but when the glass fiber content is the same, the larger stress ratio, the smaller fatigue life of lightweight aggregate concrete. With the increasing glass fiber content,the slope and intercept of fatigue equation all gradually increases,which indicates sensitivity to fatigue stress ratio increases gradually.
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