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    蘇州混凝土水泥制品研究院有限公司

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    第六期

    磷石膏礦渣基水泥混凝土配合比設計方法研究
    磷石膏礦渣基水泥混凝土配合比設計方法研究
    • 陳飛翔1,2,丁 沙1,2,水中和2,張國志1,鄭俊杰2
    2016年第6期
    摘要
    引用本文
    摘 要:磷石膏礦渣基水泥是一種新型環保免燒型膠凝材料,采用45%的磷石膏、49%的礦渣、2%的鋼渣和4%的硅酸水泥熟料經混合、粉磨而成。因目前磷石膏礦渣基水泥混凝土還沒有明確的配合比設計方法,故采用三種常用的混凝土配合比設計方法對磷石膏礦渣基水泥混凝土的配合比進行設計和配制。結果表明,全計算法無論是膠凝材料用量還是砂率均在普通法和簡易法之間,包裹程度較好,無漏石、泌水現象,較適用于C40磷石膏礦渣基水泥混凝土的配制。 Abstract: Phosphogypsum slag cement is a new kind of environmental un-burnt cementitious materials, which is mixed and ground with 45% phosphogypsum, 49% slag, 2% steel slag and 4% silicate cement clinker. There is no clear mix proportion design and preparation of phosphogypsum slag cement concrete, so design method to design and preparation of mix proportion for phosphogypsum slag cement concrete is carried out by three kinds of common concrete mix proportion. The results show that, overall calculation method for cementitious materials dosage and sand ratio is between common method and simple method, which is applied for proportion of C40 phosphogypsum slag cement concrete with good parcel level, non drain stone, and un-bleeding.
    三種不同秸稈纖維-水泥復合材料的性能對比研究
    三種不同秸稈纖維-水泥復合材料的性能對比研究
    • 許 晴1,譚欽文1,辛保泉1,歐陽臣2,羅 潔1
    2016年第6期
    摘要
    引用本文
    摘 要:為了探究不同農作物秸稈對水泥基材料的性能影響,分別利用小麥、玉米、水稻三種常見農作物秸稈與水泥制備秸稈纖維-水泥復合材料,并從預處理方式、纖維摻量、纖維長度等方面考察三種復合材料的物理力學性能。試驗結果表明:三種預處理方式中,熱堿處理后秸稈中的半纖維素含量大量減少,明顯減弱秸稈對水泥緩凝時間的影響;復合材料力學強度隨著秸稈摻量的提高先增加后減小,并在摻量為2%時達到最佳力學強度,纖維長度的增加對力學強度不利;復合材料的干密度和吸水率在不同纖維摻量、長度條件下均呈反比;經預處理后,三種秸稈纖維-水泥復合材料物理力學性能均得到提高,三種秸稈作為水泥添加材料的優選順序為:小麥>玉米>水稻。 Abstract: In order to explore the influence of different crop straw on properties of cement-based materials, straw fiber-cement composite materials are prepared by three kinds of crop straw (wheat, corn, rice) and cement, physical and mechanical properties of three kinds of composite materials are studied by pretreatment method, fiber dosage and fiber length. The results show that, the content of hemicellulose in straw is decreased after thermal alkaline treatment, and the influence of straw on the setting time of cement is obviously decreased, mechanical strength of composite material is increased first and then decreased with the increase of straw dosage, the best mechanical strength is achieved when straw dosage is 2%, the increase of fiber length is detrimental to mechanical strength; the dry density and water absorption of composite material is inversely proportional to different fiber dosage and length. After the pretreatment, the physical and mechanical properties of the three kinds of straw fiber-cement composite materials are improved, and the optimal order of three kinds of straw as the cement adding material is the wheat, corn and rice.
    C70內澆混凝土巨柱的施工與實體檢測
    C70內澆混凝土巨柱的施工與實體檢測
    • 余成行,肖 鑫,謝光輝
    2016年第6期
    摘要
    引用本文
    摘 要:分析了復雜型鋼組合結構內澆C70混凝土的特點和難點,按照優化的配合比進行生產和質量控制,對比分析多種施工工藝后采用導管導入法進行內澆混凝土施工,并在結構實體內預埋應變計等測試元件檢測混凝土的硬化性能以評價結構澆筑質量。檢測數據表明,所選擇的混凝土配合比、施工澆筑工藝和質量控制過程能夠滿足結構質量控制要求。 Abstract: Characteristics and difficulties of complex steel composite structure cast in C70 concrete are analyzed, optimized mixing proportion for production and quality control are carried out. Cast concrete construction used by catheter introduction method is compared and analyzed after a variety of construction techniques, structure casting quality are evaluated by hardening properties of tested concrete which is embedded strain gauge in structural concrete. The monitoring data shows that, structure quality control requirements are satisfied by choosing mix proportion of concrete, construction cast technique, and quality control process.
    頂管施工土體擾動的實測分析研究
    頂管施工土體擾動的實測分析研究
    • 劉航軍1,曹振生1,劉宗志1,車建國1,李 能2,3
    2016年第6期
    摘要
    引用本文
    摘 要:對福州某工程頂管施工期間地表位移、土體位移及孔隙水壓力進行了現場監測,并根據實測結果分析研究了頂管施工的土體擾動特性。結果表明,頂管施工引起的地表位移可分為頂管到達前沉降、施工擾動沉降、管土間隙沉降及土體固結沉降四個階段;土體位移(相對地表)在頂管機頭距離監測斷面5m范圍內達到最大,而孔隙水壓力變化比土體位移變化要及時,可通過監測孔隙水壓力對施工引起的土層移動作出超前預測。 Abstract: The site monitoring of surface displacement, soil displacement and pore water pressure in Fuzhou pipe-jacking construction is carried out, and properties of soil disturbance for pipe-jacking construction are studied and analyzed by measured data.The results show that, surface displacement caused by pipe-jacking construction can be divided into four stages, settlement before the arrival of pipe, settlement of pipe jacking construction disturbance, settlement of clearance between pipe and soil and settlement of soil consolidation. Soil displacement (relative to the surface) reached the maximum when the distance between pipe and monitoring cross section is 5m. Pore water pressure changes more timely than soil displacement, which soil displacement can be predicted by monitoring the pore water pressure.
    承重型橫孔連鎖混凝土砌塊的物理力學性能
    承重型橫孔連鎖混凝土砌塊的物理力學性能
    • 王 政1,2,張敬書1,2,趙 俊2,3,劉 樂1,2,劉海興1,2,張偉鵬1,2
    2016年第6期
    摘要
    引用本文
    摘 要:為了使承重型橫孔連鎖混凝土小型空心砌塊用于村鎮的砌體結構,需要測定該砌塊的物理力學性能。本文根據相關規范的試驗方法對該砌塊進行了基本的物理力學性能試驗。試驗結果表明,密度、空心率、吸水率、相對含水率、干縮值、軟化系數、抗凍性等均滿足現行規范要求。承重型橫孔連鎖混凝土小型空心砌塊的強度等級達MU10級,可以用于砌體結構的承重墻。 Abstract: In order to use load bearing horizontal-hole interlock concrete small hollow block in rural masonry structures, physical and mechanical properties of block are determined. According to relevant specification, basic physical and mechanical performance experiment of block is carried out in this paper. The experimental results show that, the proposed block can satisfy current specification of density, the hollow rate, water absorption, the relative water content, dry shrinkage, softening coefficient and frost resistance, and its strength reaches MU10 which may be used for masonry-structured load bearing walls.
    基于ABAQUS的泡沫混凝土棱柱體數值模擬
    基于ABAQUS的泡沫混凝土棱柱體數值模擬
    • 龍文武1,2,王勁松1,盧 愷1
    2016年第6期
    摘要
    引用本文
    摘 要:通過微機控制電液伺服機(300kN)對150mm×150mm×300mm泡沫混凝土棱柱體進行了軸心單軸壓縮試驗,測得泡沫混凝土彈性模量、應力-應變本構關系等力學性能。在ABAQUS中建立與實驗尺寸相同的泡沫混凝土棱柱體三維模型,并設置泡沫混凝土材料本構關系參數。對模型采用時間-位移的線性加載方法進行了單軸軸心壓縮模擬,以驗證ABAQUS中泡沫混凝土模型的正確性。通過對模型輸出的荷載-時間曲線、荷載-位移曲線、應力-塑性應變曲線分析表明,設置的ABAQUS泡沫混凝土模型能較好地模擬泡沫混凝土軸心單軸壓縮實驗結果。 Abstract: The uniaxial compression test of 150mm×150mm×300mm foam concrete prism was carried out by using computer controlled servo machine (300kN), mechanical properties of elastic modulus of foam concrete and stress-strain constitutive relation were measured. A three dimensional model of foam concrete prism with the same size as experimental size was established in ABAQUS, and constitutive relation parameters of foam concrete were set up. In order to verify the correctness of the ABAQUS model, the model is simulated by uniaxial compression that using time-displacement linear loading method. By analyzing the model output load-time curve, load-displacement curve and stress-strain curve, uniaxial compression test of foam concrete can be simulated by the ABAQUS foam concrete model.
    摻尾礦新型輕質建筑保溫材料的制備
    摻尾礦新型輕質建筑保溫材料的制備
    • 狄燕清,崔孝煒,龐 華,南 寧,周春生
    2016年第6期
    摘要
    引用本文
    摘 要:研究了鉬尾礦的粉磨特性。利用鉬尾礦替代水泥制備膠凝材料,研究了尾礦摻量、尾礦粒度、水膠比對發泡水泥力學性能和干密度的影響。試驗結果表明,鉬尾礦的易磨性遠優于礦渣;摻尾礦發泡水泥的適宜配合比為:水泥摻量90%,尾礦摻量10%,粉磨時間80min,水膠比0.52。此條件下制備的保溫材料28d齡期時,抗壓強度和干密度分別為0.47MPa和242kg/m3。 Abstract: The grinding characteristics of molybdenum tailings are studied. Cementitious materials is prepared by molybdenum tailings replaced cement, the influences of dosage of tailings, tailings particle size and water/cement ratio on mechanical properties of foam cement and dry density are researched. The experiment results indicate that, molybdenum grinding ability of molybdenum tailings is better than slag. The suitable mixture of foam cement mixed tailings is 90% cement and 10% molybdenum tailings, grinding time is 80 minutes, water/cement ratio is 0.52. Under this condition, compressive strength and dry density of foam cement in 28 days age is up to 0.47MPa and 242kg/m3.
    鋼筋籠銹蝕預應力混凝土梁承載力試驗與計算模型
    鋼筋籠銹蝕預應力混凝土梁承載力試驗與計算模型
    • 唐 碩1,喻孟雄2,姜 慧1,丁權福1,王偉偉1,李濤然1
    2016年第6期
    摘要
    引用本文
    摘??要:對5根預應力混凝土梁(4根鋼筋籠銹蝕,1根完好)進行了正截面受彎承載力試驗,總結了極限狀態下的裂縫發展狀況,分析了鋼筋籠銹蝕程度對構件荷載—撓度關系、荷載—應變曲線的影響。建立了考慮箍筋銹蝕和受壓縱筋銹蝕對受壓區混凝土綜合損傷的銹蝕預應力混凝土梁受彎承載力計算模型。試驗表明,氯鹽侵蝕作用后構件的受力裂縫會與銹脹裂縫貫通,結構符合適筋破壞特征,中和軸上移。Abstract:ConductingtestsonbendingcapacityofnormalsectionforfivePCbeams(fourcorrosion,oneintact)werecarriedout,thedevelopmentofcracksinlimitstatewassummarized.Theeffectsofcorrosiondegreeofreinforcingcageonload-deflectionrelationshipandload-straincurveareanalyzed.AcalculationmodelforloadcapacityofPCbeamswasestablished,takingcomprehensivedamageofconcretecompressionzonecausedbythestirruprustandcorrosionofpressurelongitudinalreinforcementcorrosionintoconsideration.Thetestsshowedthat,thedevelopmentstatusofthecrackisinfluencedbycorrosionofsteelbarandcrackswilleventuallybeinthecrack,thestructureaccordswiththecharacteristicsofreinforcementdamageandtheneutralaxismovesup.
    混合鋼纖維對快硬自密實混凝土彎曲協同效能研究
    混合鋼纖維對快硬自密實混凝土彎曲協同效能研究
    • 鄧安仲1,劉 奎2, 戎 翔2,陳 科2
    2016年第6期
    摘要
    引用本文
    摘 要:參照ASTMC 1609和JSCE SF-4評價方法,研究了混合端鉤鋼纖維和直鋼纖維增強快硬自密實混凝土的彎曲性能。與同等摻量的單摻鋼纖維相比,摻入混合鋼纖維,可顯著改善混凝土的力學性能,提高混凝土的彎曲韌性和抗彎強度。推導的混合鋼纖維混凝土的抗彎強度公式,可用于調整端鉤鋼纖維和直鋼纖維的摻量。比較混摻不同摻量的鋼纖維混凝土的協同效能表明,摻0.3%直鋼纖維和0.5%端鉤鋼纖維的協同效能最好。 Abstract: Flexural behavior of hybrid hooked-end steel fiber and straight steel fiber reinforced rapid hardening self compacting concrete is investigated by evaluation method of ASTMC 1609 and JSCE SF-4. Compared with same amount of single doped steel fiber, mechanical properties of concrete can be improved significantly by adding hybrid steel fiber, which can also enhance flexural toughness and flexural strength of concrete. Volume of hooked-end steel fiber and straight steel fiber is adjusted by flexural strength formula of hybrid steel fiber reinforced concrete. Compared with cooperative energy of steel fiber reinforced concrete with different dosage, cooperative energy of adding 0.3% straight steel fiber and 0.5% hooked-end steel fiber is the best.
    全輕纖維混凝土的增強增韌與耗能效果分析
    全輕纖維混凝土的增強增韌與耗能效果分析
    • 楊健輝1,2,呂 芹1,2,葉亞齊1,2,張 涵3
    2016年第6期
    摘要
    引用本文
    摘??要:為了改善全輕混凝土低強度、脆性和韌性差等缺陷,對幾種纖維單摻與混摻時的效果進行了分析。結果表明,各種全輕纖維混凝土的增強系數均大于1,比強度、彈性模量和泊松比也均大于基體混凝土,且破壞形態由脆性轉變為塑性,從而證明了全輕纖維混凝土的輕質、高強、高韌性特性。通過基于應力-應變曲線的耗能分析發現,各種纖維均能提高峰值特征量,以及均能使下降段更平緩、更長,從而證明其具有更高的耗能水平;但纖維種類與摻入方式不同,對峰前、峰后和總體韌性的影響程度均不同,以峰后韌性影響為最大,這為相關試驗研究與工程設計提供了分析依據。Abstract:Inordertoimprovesuchdefectsofall-lightweightconcrete(ALWC)aslowerstrengthandbrittlenessandworsetoughness,theeffectsonsinglemixedandmixedwithfibersareanalyzed.Theresultsshowthat,thereinforcementcoefficientsofALWCaregreaterthan1,specificstrength,elasticmodulusandPoisson'sratioareallbiggerthanmatrixconcrete,thefailuremodesarechangedfromplasticitytobrittleness,whichprovestheall-lightweightfiberreinforcedconcrete(ALWFRC)haslowerweight,higherstrengthandhightoughness.theenergyconsumptionisanalyzedbystress-straincurve,whichallkindsoffibercanimprovepeakcharacteristics,andmakethedeclinecurvemoregentlyandlonger,soALWFRChasahigherenergyconsumptionlevel.Theinfluencedegreeofpre-peak,post-peakandtotaltoughnessaredifferentbyfibertypesandaddingmethod,theeffectsontoughnessofpost-peakisbiggest,whichcanbeusedabasisforrelevantexperimentandengineeringdesign.
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