第六期_2013_《混凝土與水泥制品》雜志社

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第六期

氟石膏膠凝材料的改性研究

王裕銀1,2，滿麗瑩3，王忠平1,2

２０13年第6期

摘要

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摘??要：利用物理改性和化學改性對氟石膏進行處理，考察了物理改性和化學改性對氟石膏性能的影響，并運用XRD、SEM等手段測試了改性后氟石膏的物相組成和微觀形貌，探討了物理改性和化學改性的作用機理。結果表明，物理改性和化學改性有效激發了氟石膏的活性；物理改性降低了無水硫酸鈣晶體的晶粒度和結構規則性，增大了氟石膏的比表面積，氟石膏最佳比表面積為4600～4900cm2/g；化學改性促進了氟石膏的水化和二水硫酸鈣晶體的生長，增大了二水硫酸鈣晶體的晶粒度和長徑比，有效激發了氟石膏的強度。Abstract:Bymodifyingfluorgypsumusingphysicalandchemicalmethods,theeffectsofphysicalmodificationandchemicalmodificationontheperformanceoffluorgypsumwerestudied.ThephasecompositionandmicrostructureofmodifiedfluorgypsumwerecharacteredbyXRDandSEM,andthemechanismsofthetwomodificationmethodswerediscussed.Theresultsshowthatfluorgypsumactivityisexcitedeffectivelyusingphysicalmodificationandchemicalmodification.PhysicalmodificationcanreducethegrainsizesandstructureregularityofCaSO4,increasethespecificsurfaceareaoffluorgypsum,andtheoptimumrangeofspecificsurfaceareais4600～4900cm2/g.ChemicalmodificationcanacceleratefluorgypsumhydrationandCaSO4·2H2Ogrowth,andincreasethegrainsizesandaspectratiosofCaSO4·2H2O,meanwhile,itcanalsoenhanceeffectivelythestrengthoffluorgypsum.

混合細骨料水泥基復合材料鐵尾礦砂替代比例的研究

鮑文博，張少峰

２０13年第6期

摘要

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摘??要：利用鐵尾礦砂替代天然砂制備尾礦砂水泥基復合材料，研究了鐵尾礦砂替代比率對復合材料工作性和抗壓強度的影響。試驗結果表明，隨著鐵尾礦砂摻量的增加尾礦砂水泥基復合材料的坍落度減小，尾礦砂的替代比例在40%～60%范圍內可獲得較高的抗壓強度。Abstract:Usingirontailingsandreplacingthenaturalsandtopreparethetailingsandcementitiouscomposite,theinfluencesofthedifferentratiosofirontailingsandontheworkabilityandcompressivestrengthofthecementitiouscompositearestudied.Testresultsshowthatwhenthedosageoftheirontailingsandincreases,theslumpofthecementitiouscompositereduces.Thecompressivestrengthofthecementitiouscompositeishigherwhenthetailsandreplacementratioisintherangeof40%～60%.

深基坑全逆作法施工技術在軟土地區的應用

蘇永波1，張曉兵1，裴兵團2

２０13年第6期

摘要

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摘要：介紹了某軟土區深基坑全逆作法施工中總體設計方案的選取、地下連續墻、土方開挖等施工工藝。施工中通過采用全逆作法的施工方案，在場地狹小、對周圍相鄰建筑保護和管線保護要求較高的情況下，大大縮短了工期，滿足工程進度要求，較好地達到了預期目標。 Abstract: The construction technologies with reverse method of deep foundation pit in some soft soil area are introduced, such as the overall design plan selection, underground diaphragm wall, earth excavation, etc.. Through the construction scheme of total reverse method, it can achieve a better target in small venues and higher requirements of the adjacent building protection and pipeline protection conditions, which can shorten working time and meet the requirements of project progress.

某地鐵車站基坑信息化換撐技術的實踐與分析

李雄威，代國忠

２０13年第6期

摘要

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摘要：以常州市第一個地鐵車站基坑換撐的監測、施工過程為背景，對地鐵車站信息化施工過程進行了分析。實踐表明，監測信息可以有效指導換撐過程的實施，依據監測信息制定拆撐方案，可簡化施工過程，減少工作量，對工程項目而言既可降低建設成本又可縮短建設工期。 Abstract: The information-based construction is analyzed about the changing-support work of the first subway station pit in Changzhou. ?It is shown that monitoring information may observe and direct the support change work effectively. The new plan according to the monitoring information can simplify the construction process and decrease the work capacity. Therefore, in this project, the cost is reduced, and the construction period is shortened.

荷載條件下加載裝置和滲透性測試方法的研究

孫繼成，姚燕，吳浩，王玲

２０13年第6期

摘要

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摘要：將加載方式分為單軸拉伸荷載和壓荷載兩種，通過碟簧及應力傳感器進行恒載控制，開發出了在應力狀態下測試混凝土電通量和擴散系數的裝置。將加載一定應力的混凝土試件采用“NEL法”和“電通量法”進行在線滲透性測試，實現了持續荷載下混凝土滲透性的測試。 Abstract: Dividing the loading methods into uniaxial tensile loads and pressure loads, through controlling the dead loads by a disc spring and a stress sensor, a kind of the loading device to test the electric flux and diffusion coefficient of concrete under the stress state has been developed. The online permeability of concrete specimens loaded with a certain stress is tested by "NEL methods" and "chloride electric flux methods", which has realized to rapidly test the permeability of concrete under sustained loads.

豎向荷載作用下框支剪力墻結構轉換梁受力性能研究

蔡龍1，杜宏彪2，金仁和1

２０13年第6期

摘要

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摘要：針對轉換梁上剪力墻不同的洞口大小，采用MIDAS軟件對4個框支剪力墻結構模型在相同的豎向荷載作用下進行了有限元分析。研究了墻梁共同作用對轉換梁截面水平應力、軸力與彎矩分布規律的影響，為轉換梁在實際工程中的應用提供了一定的設計依據和建議。 Abstract: According to different hole sizes of shearing wall of the transfer-beam, four structure models of shearing wall supported by frames under same vertical loads are analyzed by finite element method with the software MIDAS. The influences of wall-beam interaction on the distribution of horizontal stress, axial force and moment of transfer-beams are studied, which can provide some design bases and suggestions for the application of transfer-beams in the practical project.

防輻射大體積混凝土溫度場及溫度應力有限元分析及應用

劉桐1，康笑語2，李玉壽3

２０13年第6期

摘要

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摘要：以經典的熱傳導方程為理論基礎，采用ANSYS間接耦合分析方法，對某醫院放療樓18MeV醫用直線加速器機房防輻射混凝土澆注完成后溫度場及溫度應力進行了有限元數值模擬分析，并與實測數據對比，得出此種方法可使溫度場及溫度應力的計算結果更接近真實值，并為防輻射大體積混凝土設計和施工過程中采取有效的防裂措施提供指導性意見。 Abstract：Based on the classical heat conduction formula, using the ANSYS indirect coupling analysis method, the finite element numerical simulating analysis and calculation are carried out for the temperature filed and temperature stress of the radiation concrete after completing pouring of the 18MeV medical linear accelerator room of a hospital radiotherapy house in Jiangsu. By comparing the calculated data with measured data, it's found that the calculation values of the temperature filed and temperature stress of the mass concrete using this method motioned above can be close to the true values, and it can provide some guiding advices for the effective crack control measures of the radiation mass concrete in the design and construction process.

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<a href="/product/1750.html" target="_parent" class="title"><i class="iconfont12"></i>火災下?；⒅楸鼗炷亮簻囟葓龅姆治?/a>

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<span class="attrValue"><i class="iconfont2"></i> 張建鋒，劉元珍，王文婧</span>
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<span class="attrValue"> ２０13年第6期 </span>
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<span class="newMs">摘要：?；⒅楸鼗炷潦沁m應我國建筑節能新形勢提出的結構自保溫材料。本文通過試驗研究和理論分析，確定了?；⒅楸鼗炷恋臒峁ば阅軈?。運用ABAQUS有限元分析軟件對?；⒅榛炷亮涸谌媸芑鸷退拿媸芑饤l件下進行非線性分析，得出了其截面溫度場的分布規律。
Abstract: Thermal insulation glazed hollow bead concrete is the insulation material of building, which can adapt the new situation of the building energy conservation in China. Through the experimental study and theoretical analysis, the thermal properties parameters of thermal insulation glazed hollow bead concrete are determined. The finite element analysis software ABAQUS is used to analyze the non-liner characteristics of glazed hollow bead concrete beams in the three-sides and four-sides fire conditions, and the characteristics of the section temperature field are obtained.</span>

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植鋼錨固技術破壞機理及粘結滑移本構關系的試驗研究

習會峰，穆建春，吳永河，龍志勤，王志剛

２０13年第6期

摘要

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摘要：植鋼錨固技術是一種新型的加固技術，本文基于植筋技術的研究，通過混凝土錨固型鋼的靜力拉拔實驗，得到了不同型號角鋼在不同強度等級混凝土下的植鋼錨固的荷載-滑移全過程曲線。試驗的破壞形式有兩類：型鋼拉斷破壞和型鋼與膠的界面滑移破壞，在不同破壞形式下荷載滑移曲線為三段式。并分析了型鋼混凝土界面的粘結破壞機理。提出線荷載-滑移本構關系作為植鋼錨固技術的粘結滑移本構關系，該關系式可用于指導有限元計算。 Abstract: Embedded steel in concrete is a new reinforcement technology. Based on the adhesive bar research, though the static stress pull-out tests of adhesive steel in concrete, the whole load-slip curves of different style angle steel with different strength grade concrete are obtained. There are two types of failure modes: the section steel snapping failure and interface sliding failure between the section steel and the structural adhesive. The load-slip curve can be divided into three stages under different failure modes. The failure mechanism of interface between steel and concrete is analyzed. The line load-slip constitutive relationship is proposed as the bond-slip constitutive relationship of embedded steel in concrete, which can be used to conduct the finite element calculation.

CFRP板嵌入式加固鋼筋混凝土少筋梁的抗彎性能研究

劉永勝

２０13年第6期

摘要

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摘要：采用CFRP板對鋼筋混凝土少筋梁進行了嵌入式加固，開展了不同加固方式試驗梁的抗彎性能實驗，分析加固長度、加固層數對加固效果的影響。實驗得到了試驗梁的荷載-撓度曲線、跨中鋼筋荷載-應變曲線以及CFRP板的荷載變形關系，并對試件的破壞形態進行了分析。實驗結果表明，嵌入式加固可以很好地提高試件的抗彎承載能力、改變試件的破壞形態，并隨著加固材料長度和加固量的增加，加固效果更好。 Abstract: The reinforced concrete beam embedded with CFRP plate at the lower surface of the beams are designed, and the experiment of the flexural behavior are carried out with different embedded way, and the effect of the reinforced material length and the reinforcement layer on the reinforced impact is analyzed. The load-deflection curves of the specimen, the load-strain curves of cross bar and the load-deformation relationship of CFRP are measured, and the failure modes of the specimens are analyzed. The results show that the embedded reinforcement can improve the bending bearing capacity, change the failure mode of the specimen, and the reinforcement effect can be improved as the length of the CFRP plate and the reinforcement volume increasing.

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