2013_2013_《混凝土與水泥制品》雜志社

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2013

水泥穩定再生骨料混合料抗壓回彈模量試驗研究

魏建軍

２０13年第8期

摘要

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摘要：根據大量水泥穩定再生骨料抗壓回彈模量試驗，考察了養護齡期、水泥用量、再生骨料來源及取代率對抗壓回彈試驗結果的影響。試驗數據分析表明，再生骨料的摻加對水泥穩定混合料的抗壓回彈模量有明顯的增強效果，且在同等再生骨料取代率水平下，隨著水泥用量和齡期的增長，抗壓回彈模量不斷增大，且再生骨料來源的混凝土強度越高，試驗測得的抗壓回彈值越大。 Abstract: Based on plenty of the compressive resilient modulus test results of cement stabilized recycled aggregate, some effect of curing periods of specimens, cement content, sources of recycled aggregate and replacement ratio on the compressive resilient modulus are studied. The study results indicate that the addition of recycled coarse aggregate can obviously enhance the compressive resilient modulus of cement stabilized macadam. Under the same condition of the replacement ratio of recycled aggregate, there is an increase tendency of compressive resilient modulus with increasing of cement content and curing period. And the higher the strength of concrete with recycled aggregate is, the larger the compressive resilient modulus got by the test is.

銅礦渣摻合料對混凝土力學性能影響試驗研究

宋軍偉，陳俊

２０13年第8期

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摘要：通過改變銅礦渣的取代水泥量，研究了銅礦渣對混凝土力學性能的影響。結果表明：隨著銅礦渣取代率的增加，混凝土的強度略有降低且脆性增加；銅礦渣混凝土的單軸受壓應力-應變曲線與普通混凝土相近；采用數值計算模型和損傷模型構造銅渣混凝土的本構關系，回歸曲線與實測單軸受壓應力-應變曲線的吻合較好，基本能夠真實地再現應力-應變曲線，可用于混凝土結構的計算分析。 Abstract: The influence of copper slag on the mechanical properties of concrete is studied by changing the cement content replaced by copper slag. The results show that with increasing the content of copper slag, the strength of concrete decreases a little while the brittleness of concrete increases; the uniaxial compressive stress-strain curve of concrete with copper slag is similar to that of ordinary concrete; the constitutive relation of concrete with copper slag is established using the numerical model and the damage model. The fitted regression curves got by numerical model approach to the measured uniaxial compressive stress-strain curves, and they can be used to analyze the constitutive relations of concrete structure.

生態混凝土在淹水區生態護坡工程中的應用研究

徐榮進1，劉榮桂1，滕斌2，宋四海3

２０13年第8期

摘要

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摘要：介紹了生態混凝土在淹水區生態護坡工程應用背景和生態混凝土制備工藝、基本性能、施工工藝以及施工過程中控制要點，并通過泰州市秋雪湖淹水區邊坡護坡及綠化工程實例，具體闡述了生態混凝土的工程應用及功能。 Abstract: The application background of eco-concrete in the flooded ecological slope protection engineering as well as its preparation technology、basic performance、construction technology and the key control points during the process of construction are introduced. And according to the example of the slope protection and greening engineering in the Qiuxue Lake in Taizhou, the engineering application functions of eco-concrete are discussed.

混凝土斜坡澆筑面的氣泡產生與消除

唐崇正

２０13年第8期

摘要

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摘要：從混凝土配合比、振搗工藝和模板材料等幾方面解釋了斜坡混凝土澆筑成型面氣泡數量多且不易消除的原因，結合透水模板布在某水電站斜面混凝土施工中的應用實例，分析了透水模板和普通鋼模板的氣泡排出機理，并依據斯托克斯定律探討了氣泡排出與傾斜模板及其混凝土參數間的相互關系，提出了消除斜坡成型混凝土表面氣泡的有效施工工藝措施。 Abstract: The reasons of numerous blowholes occurred and difficult to be free from concrete inclined surface are interpreted according to several impact aspects such as concrete mixture proportion, vibration technique and formwork type. Combined with the examples of concrete cast construction of a hydropower station applied controlled permeability formwork in inclined mould, the blowholes discharged mechanisms of controlled permeability formwork and ordinary steel formwork are analyzed. And base on Stokes Law and fresh concrete parameters, the relationship of blowholes eliminate duration and the inclined formwork is discussed. In addition, the effective construction technical measures for eliminating blowholes formed on concrete inclined surface are put forword.

行業標準《先張法預應力混凝土管樁用端板》修訂編制簡介

朱群芳，匡紅杰，王春蓉

２０13年第8期

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摘要：介紹了即將發布的行業標準JC/T 947《先張法預應力混凝土管樁用端板》的編制背景、目的及意義，并對該標準的主要修改條款作了解釋和說明。 Abstract: The compilation background, purpose and significance of industry standard JC/T 947 "End plate for pretensioning prestressed concrete piles" which will be published soon are simply introduced. And the main modified items of the standard are introduced and explained.

鋼纖維混凝土剪力墻連梁抗震性能試驗研究

王曉峰，楊忠，沈寶云，張文旭

２０13年第8期

摘要

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摘要：通過3根鋼纖維混凝土剪力墻連梁在低周反復荷載作用下的試驗，研究了鋼纖維體積率等對連梁破壞形態、滯回曲線、變形及耗能性能的影響，在不同鋼纖維體積率的連梁試件中，試件的破壞形態不相同，構件的承載力和位移延性大小不同。結果表明，在鋼筋混凝土連梁中加入足夠的鋼纖維，能夠有效地改善連梁的變形與耗能能力。 Abstract: Through the experimental study on the three coupling beams of steel fiber concrete shearing walls under the cyclic reverse load, the influences of the volume ratio of steel fiber on the destruction modes, hysteresis curves, deformation and energy costing of the coupling beams are described. During the different volume ratio of steel fiber of the coupling beams, the destruction modes are different, and the capacity and displacement ductility of the specimens are also different. The results show that enough volume ratio of steel fiber in the coupling beams can obviously improve the deformation and energy costing of the coupling beams.

復合保溫模板夾芯混凝土的界面粘結性能試驗研究

宋小軟，牛偉, 姜余豐，高德輝，單文超

２０13年第8期

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摘要：介紹了由玻璃纖維增強水泥單模板與保溫材料疊合而成的復合保溫模板，作為永久性建筑模板，澆筑混凝土后形成夾芯式復合剪力墻。此類剪力墻不僅具有自保溫功能，還可以避免保溫層直接接觸明火從而降低火災風險。通過采用不同保溫材料、不同種類混凝土及不同材料界面連接方式的相互組合，對不同工況下夾芯式復合試件各界面的抗剪粘結性能及破壞模式進行了研究；對不同界面連接方式、不同保溫材料和不同混凝土類型對試件整體抗剪性能的影響進行了對比分析，并提出了使用建議。 Abstract: A kind of composite?insulation formwork superposed by glass fiber reinforced cement single formwork and thermal insulation materials is introduced, as the permanent building formwork, which is poured with concrete to form a sandwich-type composite shearing wall. This kind of shearing walls not only have the function of self-insulation, but also make the insulation layer avoid direct contact with the open flame so as to reduce the risk of fire. According to the combinations of different insulation materials, different types of concrete and different materials interface connection ways, the shearing bond performance and failure modes of the interfaces between composite layers in different conditions are studied, the impact on the shearing behavior of the specimens, which is resulted by the different insulation materials, different types of concrete and different interface connections, is contrasted and discussed, and then some recommendations are presented.

四邊簡支預制混凝土無機保溫夾心墻體靜力性能試驗研究

朱永明1，楊佳林2，薛偉辰2

２０13年第8期

摘要

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摘要：以上海市某工程為例，開展了四邊簡支足尺預制混凝土無機保溫夾心墻體的平面外堆載試驗，對墻體的承載能力、荷載?滑移關系、墻體變形以及墻體連接件與墻體滑移等進行了研究。研究表明：墻體的開裂荷載為208kN，是荷載設計值的7.4倍；設計荷載作用下墻體的跨中撓度為1.16mm。墻體的抗彎剛度大，抗裂度與承載力高，并具有較大的安全儲備。 Abstract: In order to investigate the flexural behavior of pre-cast concrete inorganic insulation sandwich composite wall panel, a full-scale specimen simply supported on four sides was got from a practical project in Shanghai and a out-of-plane heaped load test of the specimen was carried out. Meanwhile, the bearing capacity, deformation and slip between FRP connector and concrete panel were studied in detail. The results show that the cracking load of the wall panel is 208kN, which is about 7.4 times of the design load. Mid-span deflection of the wall panel is 1.16mm under the action of the design load. It can be concluded that the wall panel has large flexural rigidity and load capacity，and its property can completely meet the normal serviceability requirements.

新型預制混凝土無機保溫夾心墻體開發及其熱工性能研究

薛偉辰1，徐亞玲2，朱永明2，楊佳林1

２０13年第8期

摘要

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摘??要：介紹了一種新型預制混凝土無機保溫夾心墻體。該墻體由內、外葉鋼筋混凝土板、中間無機保溫層以及纖維增強塑料（FRP)連接件組成，具有節能效果顯著、抗火性能和耐久性能好、生產與施工效率高等特點，可實現結構與保溫同壽命。開展了該新型預制混凝土無機保溫夾心墻體的熱工性能試驗研究，研究表明，墻體的傳熱系數為0.738W/(m2·k)，滿足JGJ134—2001《夏熱冬冷地區居住建筑節能設計標準》的要求。Abstract：Anewtypeofprecastconcreteinorganicinsulationsandwichpanelconsistedofinternalandexternalreinforcementconcretelayers,insulatinglayersandFRPconnectorsisintroduced.Thepanelhastheadvantagesofenergysaving,fireresistanceanddurability,andcanrealizethesamelife-spanbetweentheinsulationandmainstructure.Thethermalperformancetestofthekindofcompositepaneliscarriedout.Theresultsshowthatheattransfercoefficientofthewallis0.738W/(m2·k),whichcanmeettherequirementsofJGJ134—2001《DesignStandardforEnergyEfficiencyofResidentialBuildingsinHotSummerandColdWinterZone》.

聚丙烯纖維對水泥加固風積沙抗壓強度的影響研究

徐蕾

２０13年第8期

摘要

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摘要：將聚丙烯纖維作為添加劑摻入水泥加固風積沙，進行了水泥砂漿的抗壓強度（CSCM）試驗，試件由不同水泥含量的混合物和不同摻量聚丙烯纖維配制而成。在7d和28d養護期后進行抗壓強度試驗。試驗結果顯示：在水泥加固風積沙中摻入聚丙烯纖維后，聚丙烯纖維可均勻地分布于基體中，可降低裂縫尖端周圍的應力集中并阻止裂縫擴張，提高了水泥加固風積沙的機械性能，且隨著摻入的聚丙烯纖維的增加，水泥砂漿的抗壓能力也隨之增加，但當摻加率超過0.2%以后，試件的抗壓能力基本穩定，沒有更顯著的增加。 Abstract: Using of polypropylene fiber as an additive to add in the windblown sand-cement mixture, the compressive strength of the kind of Hydraulic Cement Mortars (CSCM) was tested. Test specimens were prepared with a mixture of varying content of cement and polypropylene fibers. The compressive strength of the specimens was tested after 7d and 28d curing periods. The results show that when polypropylene fibers are mixed in windblown sand-cement mortar, they will be evenly distributed in a matrix, relax the stress concentrations of crack around the tips, prevent crack expansion, and enhance the mechanical properties of windblown sand-cement mortar. Meanwhile with increasing of addition of polypropylene fiber, the compressive strength of windblown sand-cement mortar increases, however when the addition of polypropylene fiber is beyond 0.2%, it has no positive effect on compressive strength of the specimens.

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