第八期_2012_《混凝土與水泥制品》雜志社

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第八期

復摻礦渣微粉與粉煤灰配制尾礦砂混凝土及其應用

鄧初首1 ，何兆芳2

２０12年第8期

摘要

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摘要：分別以30%、40%、50%和60%的鐵礦尾礦細砂取代天然砂，并復摻礦渣微粉和粉煤灰，配制了C20、C30和C40預拌混凝土，試驗研究了混凝土和易性、強度和抗氯離子滲透性等性能。結果表明，以30%、40%和50%鐵礦尾礦細砂取代天然砂的各強度等級混凝土和易性均能滿足要求；在60%取代率時，混凝土和易性較差，但強度仍能滿足要求；50%取代率時，混凝土抗氯離子滲透能力與基準混凝土相當。 Abstract: Using iron ore tailings sand (OTS) in the ratios of 30%, 40%, 50% and 60% to substitute natural sands, and adding tiny slag powder and fly ash, the ready-mixed concrete with strengths of C20, C30 and C40 are prepared. The properties such as workability, strength and chloride ion permeability resistance of concrete are studied. The results indicate that with the OTS substitution ratio of 30%, 40% and 50%, these OTS-based concrete can meet the workability requirement. With the substitution ratio at 60%, its workability is relatively poor while its strength still meets the requirement. With the substitution ratio at 50%, the OTS-based concrete has the similar chloride ion permeability resistance to the normal concrete.

揚州新通揚運河大橋現澆鋼筋混凝土系桿拱施工技術

王續嶺，陳勇

２０12年第8期

摘要

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摘要：介紹了現澆鋼筋混凝土系桿拱施工工藝，就施工過程中容易出現的問題提出了需要注意的問題及解決方法。 Abstract: The construction process of ?cast-in-place reinforced concrete?tied arch is introduced, and the attention problems and solved methods is carried out during the construction process.

氯氧鎂水泥模殼在天津寶境棲園地下車庫中的應用

李長成1，趙順增1，李翼龍2，唐輝2，田智超2

２０12年第8期

摘要

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摘　要：介紹了氯氧鎂水泥模殼免拆施工技術在天津寶境棲園地下車庫工程中的應用情況，重點論述了模殼在車庫現澆密肋樓板施工中的施工工藝、質量控制措施，并總結了施工體會。 Abstract: The application of non-dismantling construction technique of magnesium oxychloride cement formwork in Tianjin Baojing garden underground garage project is introduced. The construction technique and quality control measures of the formwork in the construction of cast-in-place concentrated beams plates in the garage are primarily discussed, and the construction experience is also summarized.

PCCPL臥式纏絲機螺距控制裝置的改造

劉尊彥，王大陸，劉曉

２０12年第8期

摘要

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摘要：介紹了PCCPL臥式纏絲機螺距控制裝置改造前的工作原理、不足之處以及改造優化后的工作原理和優勢。通過改造，降低了復雜設備系數，進而使設備的整體造價和維修費用明顯減少。 Abstract: The working principle and disadvantages of a pitch control unit of horizontal wrapping machines of PCCPL before unit revamping, and the working principle and advantages after the pitch control unit revamping are introduced. Through the unit revamping, the complicated unit coefficient is reduced, and the whole cost for the machine and the maintenance cost are both greatly decreased.

高烈度地震區農村房屋滑移隔震技術應用探討與分析

蔡康鋒，陳翠翠，吳延輝，李玉榮

２０12年第8期

摘要

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摘要：通過汶川和玉樹兩次地震的震害統計，分析了造成巨大人員傷亡和財產損失的原因，對我國廣大農村房屋的抗震設防提出了采用基礎滑移隔震技術的建議?；A摩擦滑移隔震技術較為成熟、造價低廉、簡單易行，較適用于量大面廣的村鎮房屋建設。最后，對基礎滑移隔震技術進行了探討與應用前景的展望。 Abstract: Based on the seismic damage statistics in Wenchuan and Yushu earthquake, the reasons of caused so enormous personnel casualties and property losses are analyzed, and some suggestions of seismic fortification in the rural houses are proposed. Sliding base-isolation technique is mature, cheap and easy to do, more suitable for enormous quantity of housing construction villages. Finally, the friction sliding base-isolation technique is discussed and the development in the future is prospected.

框剪結構樓板對角裂縫成因及施工預防

楊德欽1 ，嚴偉平2，鄭建立2

２０12年第8期

摘要

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摘要：某框架剪力墻結構工程初期施工中，出現了樓板對角裂縫和跨中裂縫。經從結構、構造和施工多方面分析，主要是因板的抗裂能力不足引起的。后續施工中，采取在樓板上部加配雙向抗裂構造鋼筋網片、調整混凝土組分材料和配合比、改善混凝土性能的綜合措施，成功解決了問題。 Abstract: Some floor diagonal cracks and mid-span cracks appeared in initial construction period of a frame-shear wall structure. By comprehensively analyzing from structure to construction, the crack is caused by the deficiency of crack resistance capacity of the floor. Then, the following measures are taken: such as configuration of bidirectional crack resistance reinforced, adjustment of components materials and mix proportion of the concrete, improvement of the concrete characteristics. The crack problem is resolved successfully.

自密實混凝土保溫復合剪力墻受力性能試驗研究

李艷艷1, 2，戎賢1, 2，張健新1, 2

２０12年第8期

摘要

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摘要：通過4片自密實混凝土保溫復合剪力墻受力性能的試驗研究，其中第一組為平面外受彎試件，第二組為受剪試件，研究垂直插筋和水平斜插筋對自密實混凝土保溫復合剪力墻受力性能的影響，對比分析了自密實混凝土保溫復合剪力墻的破壞特征、承載力、剛度及插筋的受力性能等。試驗結果表明，垂直插筋和水平斜插形式下的自密實混凝土保溫復合剪力墻均具有良好的受力性能，能滿足承載力和剛度要求。與水平斜插筋相比，垂直插筋能更好地協調和約束兩側自密實混凝土的變形，使試件具有更高的承載能力和剛度。 Abstract: In order to research the effect of vertical inserted-steel and horizontal inserted-steel on mechanical behavior of self-compacting concrete insulation composite shearing wall, the shearing walls are tested based on the experiment and analysis of 2 groups of 4 specimens, in which the first group is bending specimens and the second group is shearing specimens. And the damage characteristic, bearing capacity, rigidity and stress of inserted-steel of self-compacting concrete insulation composite shearing wall are compared and analyzed. The experimental results show that the self-compacting concrete insulation composite shearing wall with two inserted steel forms all have good mechanical behavior to meet the requirements for bearing capacity and rigidity. Compared with the specimens with horizontal inserted-steel, vertical inserted-steel can better coordinate the deformation of two sides of self-compacting concrete, which makes specimens have higher bearing capacity and rigidity.

裝配式住宅預制夾芯保溫復合外墻內部冷凝問題研究

管文，趙立群

２０12年第8期

摘要

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摘要：分別以泡沫混凝土保溫板和改性酚醛保溫板作為預制夾芯保溫復合外墻的夾芯保溫層材料，對夾芯保溫復合外墻的內部冷凝問題進行了理論計算，結果表明，在夏熱冬冷地區墻體構造為60mm鋼筋混凝土+70mm泡沫混凝土+60mm鋼筋混凝土的夾芯保溫復合外墻內部存在冷凝問題，但泡沫混凝土保溫層因內部冷凝受潮而增加的濕度增量在允許范圍之內，所產生的冷凝水數量不會對結構造成損害；而墻體構造為60mm鋼筋混凝土+40mm改性酚醛保溫板+60mm鋼筋混凝土的夾芯保溫復合外墻內部則不存在冷凝問題。 Abstract: The internal condensation conditions in sandwich insulation composite wall with foamed concrete or modified phenolic thermal insulation board are studied. The results show that in hot summer and cold winter area, there isn’t an internal condensation problem in sandwich insulation composite wall with the structure of reinforced concrete 60mm + modified phenolic insulation board 40mm + reinforced concrete 60mm. But there is an internal condensation problem in sandwich insulation composite wall with the structure of reinforced concrete 60mm + foamed concrete 70mm + reinforced concrete 60mm. The quantity of internal condensation water in foamed concrete is in allowable range, which won’t cause damage to the structure.

纖維對水泥混凝土早期塑性開裂性能及抗沖擊性能的影響

施鳳蓮1，顧平2

２０12年第8期

摘要

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摘??要：依據現行標準，對不同纖維摻量的改性纖維水泥混凝土試件進行了早期收縮開裂試驗。結果表明，纖維的加入可緩解和抑制水泥混凝土試件早期塑性收縮裂縫的產生和發展，減少并細化裂縫，且隨纖維摻量的增加，這種效果更加明顯。Abstract:Accordingtothecurrentstandards,theearlyageshrinkageandcrackingtestsforthemodifiedfiberreinforcedcementconcretesampleswithdifferentfiberdosagesarecarriedout.Theresultsindicatethataddingthefibercanreliefandinhibittheearlyageplasticshrinkagecracksofcementconcretesamples,decreaseandthinthecracks,andwiththeincreaseoffiberdosage,thiseffectismoreobvious.

高抗裂低收縮纖維混凝土性能研究

閆振鵬1,2，安明喆1，李化建2，韓松1

２０12年第8期

摘要

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摘要：研究了高彈模聚乙烯醇纖維和低彈模聚丙烯纖維及其共同作用對混凝土力學性能和早期抗裂性能的影響，同時研究了混雜纖維、減縮劑及兩者復摻對混凝土早期塑性收縮和干燥收縮的影響，討論了復摻纖維和減縮劑對混凝土抗裂和收縮性能的作用機理。結果表明，纖維可明顯提高混凝土的力學性能，改善抗裂能力，其中混雜纖維的效果要優于單一種類的纖維；減縮劑可顯著降低混凝土塑性和干燥收縮，但與纖維復摻時作用效果稍有降低，需要采取適當措施保證纖維混凝土中減縮劑作用的發揮。 Abstract: The influences of polyvinyl alcohol fiber, polypropylene fiber and hybrid fibers on the mechanical property and early age crack resistance of concrete are investigated. Meanwhile, the combined effects of fibers and shrinkage-reducing agent on the plastic and dry shrinkage of concrete are studied. The mechanism of combined effects of fibers and shrinkage-reducing agent on crack resistance and shrinkage reduction of concrete is discussed. The results indicate that the mechanical property and crack resistance are obviously improved by fibers, and hybrid fibers have better effect than any other single kind fiber. The plastic and dry shrinkage of concrete are evidently reduced by shrinkage-reducing agent. When combined with fiber, the effect of shrinkage-reducing agent slightly decreases. The adequate measures are taken to ensure the normal effect of shrinkage-reducing agent in fiber reinforced concrete.

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