第十期_2011_《混凝土與水泥制品》雜志社

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第十期

超細粉煤灰對不同級配再生混凝土增強技術的研究

許元

２０11年第10期

摘要

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摘要：通過試驗，分析了超細粉煤灰對不同級配再生混凝土內部裂紋及孔隙的修復填充效應。結果表明，超細粉煤灰能夠在一定程度上改善再生混凝土的和易性及強度，但其對不同級配的再生混凝土強度的影響是不盡相同的，在摻入超細粉煤灰后，再生混凝土平均強度可提高15%左右。 Abstract: Through the tests, the filling and repairing effects of ultra-fine fly ash on internal cracks and pores of recycled concrete under different gradations are researched. The results indicate that ultra-fine fly ash could improve the workability and strength of recycled concrete in a certain degree, however, the effects of ultra-fine fly ash on the recycled concrete with different gradations are different. Recycled concrete strength can increase by an average of about 15% after adding ultra-fine fly ash.

廢棄結構混凝土粉料膠凝特性的研究

鄧洋

２０11年第10期

摘要

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摘要：廢棄混凝土類建筑垃圾經過破碎、篩分、二次破碎和研磨等預處理后，可作為再生膠凝材料替代水泥。采用鹽和堿對其活性進行激發，研究了廢棄混凝土類建筑垃圾的膠凝特性。采用抗壓強度、抗折強度、XRD、TG-DSC-DTC和SEM對試樣的力學性能和微觀結構進行了測試。試驗結果表明，廢棄混凝土類建筑垃圾具有潛在活性，激發劑可以明顯提高其活性。單一激發效果不明顯，鹽激發和堿激發復合激發效果較好，可以促使其進行水化，提高體系的強度。從微觀測試可以看出，摻入復合激發劑的試樣中鈣礬石等水化產物較多，結構致密，說明水化比較充分。 Abstract: Concrete construction waste can be used as regenerated cementitious material instead of cement through crushing, screening, secondary crushing and grinding pretreatment. Using salt and alkali to stimulate the activity of regenerated cementitious material, the gelling characteristics of concrete construction waste are researched. Compressive strength, flexural strength, X-ray diffraction, thermogravimetry-differential scanning calorimetry, scanning electron microscopy are used to investigate the mechanical properties and microstructure of specimens. The experimental results show that concrete construction waste has potential activity and the activator can greatly improve its activity. Composite activator of salt and alkali has good effect compared to single activator. Composite activator can promote hydration and improve the system strength. Samples doped with composite activator have more ettringite and compact structure through micro-test, which indicate that the samples have full hydration.

工業和生活廢棄物的利用與混凝土的使用安全

楊斌

２０11年第10期

摘要

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摘要：隨著天然砂石自然資源的日漸枯竭，工業廢棄物、建筑垃圾和污泥等加工后作為人造粗、細集料用于混凝土，摻入水泥中作混合材，以及作為混凝土的摻合料和礦物外加劑，促進了資源再生利用和節能減排工作。加強廢棄物的成分研究，規定其有害物質限量，防止利用不當，造成對環境的二次污染，影響混凝土的耐久性與使用壽命，應是當前研究的重點。 Abstract: Because of the exhaustion of the natural resources as natural sand, industrial waste, construction waste and sewage sludge after processing can be manual coarse or fine aggregates used in concrete, admixtures adding into cement and used as concrete admixtures or mineral additives, which improve the resource regeneration and energy saving. Nowadays, the research key points are aiming at studying the wastes composition, regulating the limit of harmful substance, preventing the adverse using to cause secondary pollution in environment to affect the durability and working lifetime of concrete.

高層剪力墻結構混凝土整體澆筑技術的研究與應用

呂春1，暴雨婷2

２０11年第10期

摘要

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摘要：現行高層剪力墻結構墻體和樓板混凝土施工中，首先進行墻體混凝土的澆筑，然后進行樓板混凝土的澆筑。這種通行的做法使墻體混凝土與其頂部樓板混凝土之間存在貫通的施工縫，容易出現施工質量問題，同時施工人員停工等待時間過長、無法充分進行流水施工。在齊齊哈爾大學國際交流中心工程剪力墻及樓板混凝土施工中，采用了一種先支設上部樓板模板、后支設下部墻體模板，進而同時澆筑剪力墻和樓板混凝土的施工技術。通過與傳統混凝土澆筑方法在施工質量、人員設備及材料投入情況、工期等方面的比較，證明了采用該技術能夠明顯地提高工程質量、降低人工費用、縮短施工工期。 Abstract: In general, in the concrete construction in the wall and upper floor of high-rise shearing wall structure, the method that pouring concrete for the upper floor after concreting for the wall is used. This common practice produces the construction seams in the concrete between top of wall and upper floor, which is prone to construction quality problems, while the non-work waiting time of workers is too long, which causes them unable to fully carry out the flow construction. In the construction of concrete shearing wall and floor of Qiqihar International Education Center, a new construction technology is used, which is installing floor formwork first and then installing wall formwork, after that pouring concrete of shearing wall and floor at the same time. Compared with the traditional method in construction quality, workers, equipment, material investment, construction period, etc., the new construction technology is proved to be able to shorten construction period, reduce expenses for labor and improve construction quality obviously.

免拆卸水泥復合模板-結構混凝土柱的軸心受壓性能研究

周雙喜，劉杰

２０11年第10期

摘要

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摘??要：通過對二根柱試件（一根免拆卸模板混凝土柱，一根普通混凝土柱）的試驗，研究了免拆卸模板混凝土柱在單調荷載作用下的基本力學性能，包括破壞形態、極限承載力、柱側混凝土應變、受力鋼筋應變等，對免拆卸模板-結構混凝土柱與普通混凝土柱的受力性能進行了對比。實驗結果表明：采用現行規范計算免拆卸模板-結構混凝土柱的極限承載力具有較高的安全性能；免拆卸模板-結構混凝土柱具有與普通混凝土柱相近的軸心受壓性能。Abstract：Basedontheexperimentontwocolumnspecimens(oneisaconcretecolumnwithaformworkwithoutdisassembly,anotherisanordinaryconcretecolumn),thebasicmechanicalpropertiesoftheconcretecolumnwithaformworkwithoutdisassemblyundermonotonicloadingarestudied,includingfailurepatterns,ultimatebearingcapacity,concretestrain,strainofreinforcingsteelandsoon.Thecomparisonofmechanicalbehaviorismadebetweentheconcretestructurecolumnwithaformworkwithoutdisassemblyandanordinaryconcretecolumn.Theexperimentalresultsindicatethattheultimatebearingcapacityoftheconcretestructurecolumnwithaformworkwithoutdisassemblyhassaferperformancewhileusingthecurrentspecificationtocalculateit,anditsaxialcompressioncapacityisapproximatetotheoneofanordinaryconcretecolumn.

通用型可再分散乳膠粉對砂漿性能的影響

史林

２０11年第10期

摘要

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摘要：采用十二烷基硫酸鈉和X-305作為乳化劑，PVA作為保護膠體，過硫酸鉀作為引發劑，制備了通用型可分散乳膠粉。研究了可再分散乳膠粉對砂漿容重、力學性能、粘結強度、保水性能和吸水性能的影響規律。研究結果表明：摻量小于15%時，砂漿的容重隨膠粉摻量的增加而降低，但當摻量達到20%時容重開始增加；砂漿的抗壓強度隨著膠粉摻量的增加而減小，抗折強度隨著膠粉摻量的增加而增加，壓折比隨著膠粉摻量的增加而降低；砂漿的粘結強度隨著膠粉摻量的增加而增加；砂漿的蒸發量、吸水量隨著膠粉摻量的增加而降低。 Abstract: Through using sodium dodecyl sulfate and X-305 as emulsifier, PVA as protective colloid, potassium persulfate as initiator, the general type dispersed emulsion powder is prepared. The effective laws of dispersed emulsion powder on bulk density, mechanical properties, bonding strength, preserving water property and water absorption of mortar are studied. The results show that when the dosage of emulsion powder is less than 15%, the bulk density of mortar decreases with the increasing dosage of emulsion powder, however, when the dosage of emulsion powder reaches 20%, the bulk density begins to increase. When the dosage of emulsion powder increases, the compressive strength of mortar will decrease, the flexural strength will increase, the ratio of compressive strength to flexural strength will decrease, the bonding strength of mortar will increase, the evaporation and the water absorption will decrease.

T形截面SRC異形柱正截面受力性能的分析

曲延全

２０11年第10期

摘要

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摘要：為了研究SRC異形柱正截面的受力性能，利用自己編制的型鋼混凝土異形柱正截面承載力電算程序，通過計算得到了混凝土強度、加載角、配鋼率和軸壓比變化時，T形截面SRC異形柱正截面受力性能的N-M和Mx-My相關曲線。通過對相關曲線及其受力機理的分析，得到了四種設計參數變化時，T形截面SRC異形柱正截面受力性能的變化規律。 Abstract: In order to study the normal section mechanical properties of SRC special-shaped columns, N-M interaction curves and Mx-My interaction curves of the normal section of SRC special-shaped columns with T-shaped section are obtained through calculating by the computer programs established by our own when changing concrete strength, loading angle, steel ratio and axial compression ratio. Through the analysis on the interaction curves and load-bearing mechanism, the change rules of the mechanical properties of normal section of SRC special-shaped columns with T-shaped section are summarized when four design parameters changed.

纖維水泥板和硅鈣板生產線主機設備安裝方案優化探討

王平，秦賀勝

２０11年第10期

摘要

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摘要：介紹了纖維水泥板和硅酸鈣板生產線主機設備安裝的重點，按照纖維水泥板和硅酸鈣板產品特點，力求在安裝階段就按照正確的方式進行，減少因安裝誤差過大造成的返工及廢料損失，規范纖維水泥板和硅酸鈣板行業主機設備安裝程序。 Abstract: The key points of the host equipment installation for fiber cement plates and silicate calcium plates production line are introduced. According to the production characteristics of fiber cement plates and silicate calcium plates, the correct manner should be carried out during the installation phase, which can reduce the rework and waste loss because of the too larger installation errors, and regulate the host equipment installation process for fiber cement plates and silicate calcium plates industry.

礦物摻合料與纖維雙摻對混凝土抗滲性能的影響及工程應用

錢紅萍，李書進

２０11年第10期

摘要

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摘要：采用RCM氯離子擴散系數法和滲水高度法，研究了粉煤灰、礦粉、PVA纖維、纖維素纖維的摻入對混凝土抗滲性能的影響。試驗結果表明，粉煤灰和礦粉的摻入能有效降低混凝土中氯離子擴散系數和滲水高度。在摻加礦物摻合料的基礎上再摻入纖維混凝土的抗滲性能進一步提高，雙摻對混凝土抗滲性能提高的復合效應明顯。 Abstract: The influences of fly ash, slag, PVA fiber and cellulose fiber on the penetration resistance of chloride ions into concrete are studied, through using the chloride ions diffusion coefficient test method （RCM） and depth of water penetration test method. The experimental results show that the addition of fly ash and slag can effectively reduce the chloride ion diffusion coefficient in concrete and water seepage height. Mineral admixture concrete mixed with fibers can further improve the impermeability of concrete, and combined admixtures of mineral admixtures and fiber can obviously improve the impermeability of concrete.

摻減水劑對混凝土電桿質量及生產成本影響的分析

周萬軍

２０11年第10期

摘要

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摘要：在配制混凝土時摻入合適的減水劑是改善混凝土性能、提高混凝土強度行之有效的措施,也是節省能源、節約水泥的重要途徑。本文就混凝土電桿生產中使用減水劑對其質量及成本的影響及減水劑使用中應注意的事項進行了分析探討。 Abstract: Adding suitable water reducers is an effective way to improve the properties and strength of concrete when preparing the concrete, and it can also save the energy and cement. The effects of water reducers on the quality and cost in the process of concrete pole production and the precautions for using water reducers are analyzed and discussed.

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