第五期_2016_《混凝土與水泥制品》雜志社

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第五期

稻草纖維混凝土物理力學性能試驗研究

譚曦，蘇有文

２０16年第5期

摘要

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摘要：對同一混凝土配合比，不同形狀和不同摻入量的稻草纖維混凝土進行了物理力學性能試驗。結果表明，同一混凝土配合比下，隨著稻草纖維摻量的增加，不同形狀稻草纖維混凝土的物理力學性能會有所影響，抗壓、劈裂抗拉及抗折強度會有所降低，但稻草纖維的摻入不僅能改善混凝土的韌性，也可提高混凝土的抗沖擊性能。 Abstract：As the same concrete mix proportion, experiment of physical and mechanical properties with different shapes of straw fiber reinforced concrete is carried out. The results show that, under the same concrete proportion, with the increase of straw fiber dosage, physical properties of straw fiber reinforced concrete with different shapes will be affected, compressive strength, splitting tensile and flexural strength will be reduced, however, straw fiber can not only improve the toughness of concrete, but also can enhance the shock resistance of concrete.

沙特麥麥高鐵特大箱梁橋墩身施工技術

董利民

Bridge construction; Bridge pier; Formwork construction

摘要

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摘要：墩身是橋梁的重要豎向構件，也是橋梁施工的重點環節，其施工質量直接影響到橋梁受力。結合我國海外首條設計時速360km高鐵——沙特麥麥高鐵特大橋梁工程施工實例，針對該橋梁的墩身施工環節進行了探討，總結出橋梁墩身施工各個環節的相關控制技術，可為同類工程提供參考和借鑒。 Abstract: Pier is the important vertical component of bridge, which is also the key links in bridge construction, the construction quality directly affects the bridge force. Combined with Chinese oversea first design speed of 360km high-speed rail-Haramain high speed (HHR) rail project rail bridge beam engineering construction as example, pier construction of bridge is discussed, related control technology of bridge pier construction in each link is summarized, which can provide the reference for the similar engineering.

桶式基礎結構氣密性高性能混凝土施工技術

練學標

２０16年第5期

摘要

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摘要：桶式基礎結構的浮運安裝采用氣浮及負壓安裝工藝，氣密性至關重要，同時設計對混凝土提出了耐久性的高標準要求，氣密性高性能混凝土在水運工程中沒有成熟的施工經驗。本文以實際工程為例，介紹了氣密性混凝土的配制、氣密性的測試方法、混凝土的施工控制等，可供類似工程參考。 Abstract: The float installation of bucket-based structure is applied by air-flotation and installation process, the structure concrete air tightness is essential, at the same time, the design of concrete durability with high standard is proposed, the tightness of high performance concrete in marine engineering has little mature construction experience. For practical engineering as an example, mix design of gas-tightness concrete, test methods of air tightness, and construction control of concreteare intraduced, which can be used for reference in the similar projects.

水泥基多孔吸聲材料研究進展

高漢青，于大第，楊曉光，宋濤文，陳夙，王煒

２０16年第5期

摘要

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摘要：從水泥基多孔吸聲材料的性能特點、吸聲機理、材料組成、構造、應用領域以及制備方法等多個角度，系統地總結了國內外水泥基多孔吸聲材料的研究和發展情況，并提出了需要解決的問題和將來的發展方向。 Abstract: Research progress and developments of cementitious porous sound-absorbing materials at domestic and abroad are summarized through several aspects, including performance features, absorption mechanism, material composition, structural form, application area and preparation method. The problem need to be solved and the direction for future research are also pointed out.

真空絕熱板外墻保溫系統性能研究

馮長偉，蘇晉鵬，金志華

２０16年第5期

摘要

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摘要：進行了真空絕熱板外墻保溫系統性能試驗研究，發明了一種新型的外墻保溫拉伸黏結強度專用切割裝置。結果表明，真空絕熱板具有較低的導熱系數，物理力學性能良好。真空絕熱板薄抹灰外墻保溫系統具有較好的安全性能和耐久性能，抗風壓性能達到6.3kPa，耐候性試驗后墻體外觀較好，無空鼓、剝落和裂縫，耐候試驗后抹面層和保溫層拉伸黏結強度達到0.08MPa，系統抗沖擊性能達到3J。系統具有較低的吸水量和較高的水蒸氣濕流密度。真空絕熱板外墻保溫系統已經在某些外墻和屋面工程中應用，效果較好。 Abstract: The performance experiment of exterior wall insulation system for vacuum insulation board was carried out, and a new type of external wall thermal insulation tensile bond strength special cutting device was invented.The results show that, vacuum insulation board with lower thermal conductivity has good physical and mechanical properties. Vacuum insulation board thin plastering exterior wall thermal insulation system has better security performance and durability, anti-wind pressure performance reaches to 6.3kPa, exterior wall of weathering test after experiment is good, which is no hollowing, spalling and cracking, and tensile bond strength of finishing layer and the insulation layer reaches 0.08MPa after weathering test, system shock resistance reaches 3J. The system has a low water absorption and high water vapor density, and the external thermal insulation system of vacuum insulation panels has been used in some external wall and roofing projects, the effect is better.

空氣滲流和冷凝對?；⒅楸厣皾{濕積累影響的數值分析

張冰，程忠慶，馬明丹

２０16年第5期

摘要

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摘要：?；⒅楸厣皾{內的濕積累是水蒸氣擴散，空氣滲流，以及冷凝三種因素共同引起的，本文構建了以水蒸氣分壓力為驅動勢的濕積累計算模型，計算并分析了水蒸氣擴散，空氣滲流，以及冷凝三種因素對濕積累的影響?？諝饬魅霑r砂漿內水蒸氣分壓力和濕積累速率最大值向內遷移；空氣流出時則相反。水蒸氣冷凝的速率與冷凝區域的邊界溫度成正比。 Abstract: The humidity accumulation in thermal insulation mortar of glazed hollow beads is leaded by three factors include vapour diffusion, air transfusion and condensation. Humidity accumulation counting model is structured by using steam partial-pressure as driving force, the influence of vapour diffusion, air transfusion and condensation on humidity accumulation is counted and analyzed. When air inflows, the maximum value of steam partial-pressure and rate of humidity accumulation moved forward; when air outflows, the situation was converse. The rate of condensation for steam and boundary temperatures of condensation zone are direct proportion.

不同摻量水泥生土砌塊濕變環境下體積穩定性研究

楊久俊1,2，鄭亞然2，羅忠濤2

２０16年第5期

摘要

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摘要：通過濕變環境下水泥生土砌塊的吸濕性和膨脹變形，研究了水泥生土砌塊的吸濕特性和膨脹變形的作用機理及其力學性能與環境濕度的關系。研究結果表明，水泥生土砌塊的吸濕量與膨脹量遠小于素生土砌塊的吸濕量與膨脹量，且在同一濕度的不可逆收縮變小。隨著環境相對濕度的升高，水泥生土砌塊的抗壓強度逐漸降低。水泥摻入可以顯著改善濕度對砌塊抗壓強度的影響。 Abstract: Relationship between environmental humidity and mechanism and mechanical properties of absorption characteristic of cement raw soil block and expansion deformation of cement raw soil block were studied through absorption of cement raw soil block and expansion deformation under the condition of humidity variation. The results show that, the moisture absorption and expansion of cement block is much less than that of raw block, and irreversible shrinkage become smaller at the same humidity. With the increase of environmental relative humidity, compressive strength of cement raw soil block is gradually reduced. The influence of humidity on compressive strength of block can significantly improved by mixing cement.

超高性能混凝土纖維-基體黏結性能測試與機理分析

程俊1，劉加平1，張麗輝2

２０16年第5期

摘要

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摘要：為研究超高性能混凝土纖維-基體黏結性能，通過單根纖維拉拔試驗得到纖維拔出應力-位移曲線，并研究界面參數對纖維黏結性能的影響；通過掃描電鏡觀察、比較拔出纖維表面和端部形貌，發現鋼纖維被拔出后，端部和表面黏結大量“球狀”碎屑，且表面有“切削”痕跡，當鋼纖維體積摻量為2%、埋入深度為3mm時，拔出纖維表面附著的碎屑密度最大，纖維-基體黏結強度最佳；結合混凝土拉伸本構模型，計算理論拉伸強度σc1，并通過配制相應的混凝土，利用單軸拉伸試驗測得試驗拉伸強度σc2，比較發現，其誤差范圍為5%±2%。 Abstract: In order to study bonding properties of fiber-matrix adhesion of ultra-high performance concrete, a stress-displacement curve is obtained by a single fiber pullout experiment, and the influence of interface parameters on fiber bonding properties is investigated; the surface and end of steal fiber attach to large numbers of "spherical" clastic by scanning electron microscopy and the surface has "cutting signs" at the scene, when the volume content of fiber is 2%, buried depth reaches 3mm, density of "spherical" clastic attached to the surface of pulled fiber is the largest, bonding properties of fiber-matrix is the best; combining stretch constitutive model of concrete, calculating the theoretical tensile strength σc1 and formulating the corresponding concrete, measuring the tensile strength σc2 by uniaxial tensile test, which the error range is 5%±2%.

玄武巖纖維和環氧樹脂乳液對水泥砂漿的耦合作用

鄭召1，李玉香1，何順愛2，馬雪1

２０16年第5期

摘要

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摘要：在水泥砂漿中分別單摻或復摻玄武巖纖維和環氧樹脂乳液，測試了水泥砂漿的流動性和力學性能，并用壓汞法測試水泥砂漿的孔結構，研究了玄武巖纖維和環氧樹脂乳液對水泥砂漿性能的耦合作用。結果表明，水泥砂漿在纖維摻量為1.5%，聚灰比為7.5%時流動性最好；玄武巖纖維和環氧樹脂乳液的加入能有效降低水泥砂漿的孔隙率，纖維摻量為1.5%，且聚灰比為7.5%時，具有最小孔隙率6.31%；玄武巖纖維摻量控制在1.5%，水泥砂漿在聚灰比為12.5%時具有最小壓折比4.14。 Abstract: Basalt fiber and epoxy resin emulsion were single mixed or double mixed in cement mortar, the liquidity and mechanical properties of cement mortar were tested, the pore structure of cement mortar was tested by mercury intrusion method, the coupling effect of the basalt fiber and epoxy resin emulsion on properties of cement mortar were investigated. The results show that, liquidity of cement mortar is the best when fiber content is 1.5% and ratio of polymer to cement is 7.5%; the addition of basalt fiber and epoxy resin emulsion can effectively reduce the porosity of cement mortar. When fiber content is 1.5%, and ratio of polymer to cement is 7.5%, the porosity has the minimum value of 6.31%; when the basalt fiber content was controlled in 1.5% and ratio of polymer to cement is 12.5%, the ratio of compressive strength to flexural strength has the minimum value of 4.14.

聚丙烯纖維稻殼砂漿早期收縮裂縫試驗研究

趙端鋒，劉肖凡，李繼祥，李坦

２０16年第5期

摘要

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摘要：為提高新型墻體材料稻殼砂漿的抗裂性能，在稻殼砂漿中摻入聚丙烯纖維，用平板法進行早期收縮裂縫試驗，研究不同長度（6mm、9mm、12mm）、不同體積摻量（0.05%、0.10%、0.15%）的聚丙烯纖維對稻殼砂漿早期收縮性能的影響。試驗研究表明，6mm長度、0.05%體積摻量的聚丙烯纖維稻殼砂漿阻裂效果最佳,裂縫降低系數為95.83%。 Abstract: In order to restrain the property of early shrinking crack of rice husk mortar as a new wall material, the experimental research on early shrinking crack is carried out by agar plate method through rice husk mortar adding polypropylene fiber. The influence of rice husk mortar with different volume dosage (0.05%、0.10%、0.15%) and different fiber length (6mm、9mm、12mm) on early shrinking crack is studied. The results show that crack resistance effects of rice husk mortar with 6mm length, 0.05% volume dosage of polypropylene fiber is the best and the decreasing coefficient of crack is 95.83%.

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