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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

    基于SEM和ICT的建筑垃圾再生磚細觀破壞機理
    基于SEM和ICT的建筑垃圾再生磚細觀破壞機理
    • 宿 輝,唐 陽,韓國松,汪 健,聶漢江
    2014年第10期
    摘要
    引用本文
    摘 要:以建筑垃圾再生磚為研究對象,進行了單軸壓縮試驗,擬合了應力-應變曲線,采用掃描電鏡(SEM)對再生磚的細觀結構進行觀測,利用工業CT獲得了再生磚壓縮破壞過程中的裂紋分布特征,并借助分形理論進行分析裂紋演化特征。研究結果表明:建筑垃圾再生磚具有較大的孔隙率,存在諸多的初始缺陷,裂紋容易最先在這些薄弱環節出現。水泥石將骨料包裹起來形成筋絡結構可分割破壞區,延緩裂縫的伸展及匯聚過程,可有效提高再生磚的強度。同時再生磚具顯著的不均勻性,在荷載作用下不同斷面的分形維數的變化規律有較大的差異,斷面上平均強度越高,分形維數的變化越平緩,反之則變化要更劇烈,但整體物理性能與混凝土是相似的。CT和SEM結合可有效地對建筑材料的微觀結構和破壞機理進行分析,為進一步揭示再生磚的細觀損傷破裂機理奠定基礎。 Abstract: Based on the uniaxial compression test of construction waste recycled brick, the stress-strain curve was fitted, and the microscopic structure of recycled brick are observed by SEM. Crack distribution characteristics in the process of recycled brick compression failure were gained by using industrial computed tomography (CT), and the crack evolution characteristics were analyzed by means of fractal theory. The researches indicate that: construction waste recycled bricks have larger porosity, it exists many initial defects in the recycled aggregates, in these weak links cracks easily appears first and face to internal development of the cement matrix. Aggregates are wrapped by the cement matrix and only to form the sinew structure of separable damage zone, the cracks extension and the convergence process are delayed, the strength of the recycled brick can be efficiently improved. Meanwhile, recycled brick has the inhomogeneity, it exists some differences that change rules of the fractal dimension about different cross section in the load condition are major, the average strength higher, the fractal dimension changes more gently, the opposite changes are more severe, but the overall physical properties and the deformation regularity of under uniaxial loading is similar with those of concrete; the microstructures of construction materials and failure mechanism are analyzed by CT and SEM, which lays a foundation for further revealing the microscopic damage fracture mechanism of the recycled brick.
    煤基固廢協同利用制備硅酸鈣板的試驗研究
    煤基固廢協同利用制備硅酸鈣板的試驗研究
    • 楊志杰1,葉俊沛2,孫俊民1,苗瑞平1,張金山2,曹永丹2
    2014年第10期
    摘要
    引用本文
    摘??要:以硅鈣渣、粉煤灰、脫硫石膏等為原料制得了托貝莫來石型(5CaO·6SiO2·5H2O)硅酸鈣板。研究表明,硅鈣渣摻量不高于50%時,有助于硅酸鈣板強度的提高,粉煤灰和硅鈣渣之間存在相互協同所用,只有二者的配比適當時硅酸鈣板的性能才能夠達到最佳。Abstract:Thecalciumsilicateboardwithtobermorite(5CaO·6SiO2·5H2O)waspreparedbyusingsilicium-calciumslag,flyashanddesulfurizationgypsumasrawmaterials.Thestudyshowsthatthestrengthofcalciumsilicateboardcanbeimproved,whenthesilicium-calciumslagcontentislowerthan50%,andthereisamutualconcurrenteffectbetweenwithflyashandsilicium-calciumslag.Sothecalciumsilicateboardcangetthebestproperties,onlyifproportionofflyashandsilicium-calciumslagisappropriate.
    商品混凝土裂縫案例分析與研究
    商品混凝土裂縫案例分析與研究
    • 張文卷
    2014年第10期
    摘要
    引用本文
    摘 要:結合某商品混凝土公司遇到的幾個混凝土工程案例的裂縫問題,分析了混凝土裂縫產生的原因,提出的相應預防處理措施,可有效控制和減少混凝土裂縫的產生,并為類似工程提供借鑒。 Abstract: Combining with the crack problems of several concrete engineering cases of a commercial concrete corporation, the causes of cracks on the concrete are analyzed, and crack preventive measures are put forward, so that the concrete cracks are effectively controlled and reduced. The measures can provide a reference for the similar engineerings.
    壓力分散型懸錨式擋土墻承載力分析
    壓力分散型懸錨式擋土墻承載力分析
    • 吳建清1,2,張崇高3,張宏博1,2,宋修廣1,2
    2014年第10期
    摘要
    引用本文
    摘 要:為研究影響壓力分散型懸錨式擋土墻承載力的相關因素及耐久性評價,采用FLAC 3D軟件對實體擋土墻工程進行了數值模擬仿真計算。對影響壓力分散型懸錨式擋土墻承載力的主要因素進行了控制分析。數值計算結果表明:土壓力呈非線性分布,并隨填土高度的增加而增大;擋土墻在豎向和水平向都存在明顯的土拱效應;錨桿存在最佳的設置高度和豎向間距;預應力對提高壓力分散型擋土墻承載力的效果不顯著;增大填料的粘聚力會提高壓力分散型懸錨式擋土墻的承載力;擋土墻的耐久性好,在土體強度發生較大的衰減及水環境下仍可保持穩定。 Abstract:In order to study the influencing factors and durability of bearing capacity for pressure dispersion suspended-anchor retaining wall, FLAC 3D software was used to simulate retaining wall engineering. The main factors influencing the bearing capacity of the earth retaining wall were controlled and analyzed. The results show that the distribution of soil pressure is nonlinear, and soil pressure increases with the increasing of filling height. Soil anchoring effects of retaining wall is obvious in vertical and horizontal direction. Anchor has the optimal setting height and vertical spacing. Prestress has little effects on increasing the bearing capacity of the retaining wall. Filler with high cohesion can improve the bearing capacity of the retaining wall. The durability of the retaining wall is good, and the retaining wall has high stability with the environment of great soil strength attenuation and water erosion.
    超大型鋼混凝土柱腳灌漿施工技術
    超大型鋼混凝土柱腳灌漿施工技術
    • 王棟杰,祝凌宇,武雄飛,劉學飛,徐亞兵
    2014年第10期
    摘要
    引用本文
    摘 要:隨著社會的發展,超高層建筑越來越多,型鋼混凝土結構能夠極大的減少混凝土柱截面尺寸,因此普遍應用在超高層建筑中。本文闡述了鋼柱柱腳與混凝土底板之間二次灌漿的施工工藝及操作要點,可確保型鋼柱腳灌漿的密實性,保證工程施工質量。 Abstract: With the developing of society, super high-rise buildings are becoming more and more popular. Because steel reinforced concrete structure can greatly reduce the concrete column section size, it is widely used in super high-rise buildings. Here, the secondary grouting construction technology and operating essentials between the steel column foot and concrete slabs are expounded to ensure the compactness of grouting of steel column foot and the construction quality.
    創新技術在管樁滾焊機中的應用
    創新技術在管樁滾焊機中的應用
    • 趙瑞軍
    2014年第10期
    摘要
    引用本文
    摘 要:提出了降低管樁滾焊機能耗、提高生產效率和焊接質量以及延長設備耐久性的具體措施。實踐表明:通過實施以上措施,管樁滾焊機的節能效率和生產效率顯著提高,焊接質量明顯改善,設備的耐久性也得到延長。 Abstract:Some improve measures of reducing the energy saving of roll welder for piles, improving production efficiency and welding quality and prolonging the durability of roll welder are put forward. The practice shows that by implementing the above improvements on the roll welder, energy efficiency and production efficiency of the roll welder increase significantly, welding quality markedly improves, and the durability of equipment are prolonged.
    基于OpenSees的混合試驗方法
    基于OpenSees的混合試驗方法
    • 袁小龍,韓曉健
    2014年第10期
    摘要
    引用本文
    摘 要:采用有限元軟件OpenSees進行數值子結構的模擬,并通過接口程序OpenFresco和MTS控制器構成混合試驗系統,進行了單層平面鋼框架抗震性能的混合試驗仿真和混合試驗。研究結果表明:混合試驗方法能夠有效地進行結構抗震性能試驗,有限元軟件、接口程序和控制系統之間通過數據實時交互完成整個試驗,試驗系統具備良好的穩定性和精度。 Abstract: The numerical substructures are simulated by using a professional finite element software OpenSees, and a hybrid testing system is established through the interface program OpenFresco and the MTS experimental controller. Then, a hybrid simulation and a hybrid testing of anti-seismic property of the plane single-story steel frame are carried out. The results show that: using hybrid testing method to study anti-seismic property of structures is feasible, through data real-time interaction of the finite element software, the interface program and the experimental control system, the test is accomplished, and the testing system has good stability and accuracy.
    夾心自保溫砌塊砌體力學性能試驗研究
    夾心自保溫砌塊砌體力學性能試驗研究
    • 王麗沙1,李佰壽1,全云龍2,李珍淑1
    2014年第10期
    摘要
    引用本文
    摘 要:通過對夾心自保溫砌塊塊型的優化選擇,對材料性能、基本力學性能和砌體的軸心抗壓強度進行了研究。結果表明,塊型規格為390m×190mm×190mm的夾心自保溫砌塊性能優越,可用于非承重外墻使用,滿足砌體有關規范對材料性能、力學性能的要求,且便于實際施工推廣。 Abstract: Through the optimal selection of sandwich insulation concrete block type, the properties of materials, basic mechanical properties and axial compressive strength of the concrete block were studied. The results show that sandwich insulation concrete block with the block type specifications of 390m×190mm×190mm has superior performances which can meet the requirements of relevant specifications, and can be used for building the non load-bearing walls, so the block type is advantageous for the actual construction.
    孔洞缺陷對鋼筋混凝土框架柱抗震性能的影響
    孔洞缺陷對鋼筋混凝土框架柱抗震性能的影響
    • 劉建民,單慶飛,連業達
    2014年第10期
    摘要
    引用本文
    摘 要:使用ANSYS有限元軟件建立了20種帶不同孔洞缺陷的鋼筋混凝土框架柱有限元模型,并對其進行了模擬低周反復加載,分析了孔洞缺陷對框架柱荷載-位移滯回曲線、骨架曲線、位移延性比、塑性滯回耗能、剛度退化及強度退化等抗震性能指標的影響規律。結果表明,孔洞缺陷可以改變框架柱的破壞形式,降低框架柱的極限承載能力、位移延性比和塑性滯回耗能能力,加劇了框架柱的剛度退化和強度退化,給框架柱的抗震帶來較為不利的影響,貫穿孔洞造成的影響最大。 Abstract: The 20 reinforced concrete frame column finite element modes with different hole defect were established based on ANSYS. The simulative repeated low cycle loading tests were carried to research on the influence of hole defect to the column seismic performance targets, including load-displacement hysteresis curve, skeleton curve, displacement ductility ratio, hysteresis energy, stiffness and strength degradation. It’s found that the hole defect would change failure mode of frame column, reduce the ultimate bearing capacity, displacement ductility ratio and hysteretic energy and aggravate stiffness and strength degradation. Through hole has the worst impact on the frame column.
    聚丙烯纖維混凝土板火災后性能變化規律研究
    聚丙烯纖維混凝土板火災后性能變化規律研究
    • 閆倩倩1,李雪峰2,侯子義1
    2014年第10期
    摘要
    引用本文
    摘??要:通過模擬火災現場材料表面實際升溫曲線,對普通混凝土板及不同摻量聚丙烯纖維混凝土板進行火災實驗,結果表明:不同于高性能混凝土中常出現的高溫爆裂現象,普通混凝土在經歷高溫與冷卻的過程后,內外部溫度梯度應力使其出現很大的裂縫。而通過摻加聚丙烯纖維可有效地緩解裂縫寬度,降低高溫對普通混凝土的損傷。同時,通過測試高溫前后混凝土板底面及側面回彈值發現,由于混凝土板內部與側面溫度值在空間內分布不同,進而造成混凝土材料回彈值的損失也不一樣,使得混凝土板殘余力學性能呈空間分布,且與溫度場有著直接的關系。Abstract:Thefiretestsofthenormalconcreteslabandpolypropylenefiberreinforcedconcreteslabwithdifferentcontentsofpolypropylenefiberarecarriedoutthroughsimulatingthepracticalheatingcurveofmaterialsurfaceinthefiresite.Theresultsshowthatnormalconcretehascracksduetothetemperaturegradientinsideoroutsidetheconcreteduringcoolingaftercontinuousheating,whichisdifferentfromthespallingofhighstrengthconcreteatelevatedtemperatures,andthepolypropylenefiberintheconcretecaneffectivelyrestrainthecrackdevelopment.Thereboundhammertestscarriedoutonthepost-fireconcreteslabsshowsthatthespatialdistributionofresidualmechanicalpropertyinsidetheslabscorrelateswiththetemperaturefield.
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