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    蘇州混凝土水泥制品研究院有限公司

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    第十期

    硫鋁酸鹽水泥混凝土的抗硫酸鹽侵蝕性能
    硫鋁酸鹽水泥混凝土的抗硫酸鹽侵蝕性能
    • 李方元,唐新軍,胡 全,阿里木江·蘇拉依曼
    2012年第10期
    摘要
    引用本文
    摘 要:通過制配水泥膠砂試件進行硫酸鹽侵蝕試驗,研究了水灰比、養護齡期、侵蝕溶液濃度、侵蝕齡期等對硫鋁酸鹽水泥混凝土抗硫酸鹽侵蝕能力的影響;并采用宏觀觀測和掃描電鏡(SEM)、能譜(EDS)微觀觀測方法,分析和揭示其抗硫酸鹽侵蝕機理,并與高抗硫硅酸鹽水泥和普通硅酸鹽水泥的抗硫酸鹽侵蝕性能進行了對比。結果表明,硫鋁酸鹽水泥膠砂試件可以抵抗高濃度硫酸鹽的侵蝕,且隨著水灰比的降低、養護齡期的延長,其抗硫酸鹽侵蝕能力會進一步得到提高;硫鋁酸鹽水泥混凝土較高的抗硫酸鹽侵蝕能力,主要取決于混凝土的高密實度和化學侵蝕內因的減少。侵蝕發生在開口孔隙內,侵蝕產物是團簇狀鈣礬石(AFt),硫鋁酸鹽水泥具有顯著高于高抗硫水泥抗硫酸鹽侵蝕的能力 Abstract: Considered the water-cement ratio, curing period, concentration of erosion solution and erosion age factors, the capability of resisting sulfate corrosion of sulphoaluminate cement concrete (SAC) is tested. To analyze and reveal the anti-erosion mechanism of SAC, the scanning electron microscope (SEM) and energy dispersion spectrum (EDS) method are used to observe the microscopic features of specimens. And to evaluate the anti-erosion capability, the experiment of resisting sulfate corrosion is also tested between high sulfate resistant Portland cement (HSR) and ordinary Portland cement (P·O). The results indicate that sulphoaluminate cement mortar specimens can resist the erosion of high concentration sulfate, and with the reduction of water-cement ratio and the curing period extension, its ability of sulfate erosion resistance will be further improved; the high sulfate resistance ability of sulphoaluminate cement concrete mainly depends on its high density and the chemical erosion reduced. It’s the ettringite (AFt) that occurs in the opening voids, and the capability of resisting sulfate corrosion of SAC is significantly higher than that of HSR
    高強再生輕骨料和玻璃微珠配制輕質高強混凝土的研究
    高強再生輕骨料和玻璃微珠配制輕質高強混凝土的研究
    • 陳雪梅,嚴 云,張 旭,胡志華
    2012年第10期
    摘要
    引用本文
    摘??要:采用高強再生輕骨料和玻璃微珠,利用體積法配制出了性能滿足預定控制要求的輕質高強混凝土。通過對比試驗研究了玻璃微珠、水泥品種、骨料摻量對輕質高強混凝土力學性能和工作性能的影響。結果表明,調節玻璃微珠的粒度和摻量可有效控制混凝土的表觀密度,使用高強再生輕骨料可提高混凝土的強度和工作性。試驗配制出了表觀密度1520kg/m3、28d抗壓強度58.9MPa、比強度1.0667、工作性能較好的輕質高強混凝土。Abstract:Basedonthevolumemixproportionprocedure,thehigh-strengthlightweightconcretemeetingthecontrolrequirementsofscheduledperformancesispreparedbyusinghigh-strengthrecycledlightweightaggregatesandglassmicrospheres.Theeffectsofglassmicrospheres,cementvarietiesandcontentofrecycledlightweightaggregatesonthemechanicalpropertiesandworkabilityofhigh-strengthlightweightconcretearestudiedbycomparisontests.Theresultsshowthatvaryingeithertheparticlesizeorcontentofglassmicrospherescaneffectivelycontrolthesurfacedensityofconcrete,andusinghigh-strengthrecycledlightweightaggregatescanimprovethecompressivestrengthandworkabilityofconcrete.Atlast,thehigh-strengthlightweightconcretewithgoodworkability,compressivestrengthachieving58.9MPa,surfacedensityof1520kg/m3,andratioofstrengthtodensityof1.0667canbeobtained.
     TORRENT法測試混凝土空氣滲透性能研究
    TORRENT法測試混凝土空氣滲透性能研究
    • 石 亮,吳 燁,劉建忠
    2012年第10期
    摘要
    引用本文
    摘 要:TORRENT法是一種測試混凝土空氣滲透性能的新方法。通過試驗對TORRENT測試方法的校正進行了研究,并分析了混凝土密封狀態、濕度、孔隙連通程度對TORRENT空氣滲透性能測試結果的影響。結果表明,內腔殘余氣壓的扣除是TORRENT測試方法校正的關鍵,相比于試件密封狀態,濕度與孔隙連通程度對TORRENT法空氣滲透性能的測試結果影響更為顯著,TORRENT法在中低密實程度混凝土空氣滲透性能測試過程中誤差較小。 Abstract: TORRENT method is a new kind method for testing the concrete air permeability. Through the experiment, the modification for TORRENT testing method is studied, and the effects of sealed status, humidity and pore connectivity on air permeability testing results of concrete by TORRENT method are analyzed. The results indicate that the key point for modifying the TORRENT testing method is to deduct the intracavity residual pressure. Compared with the sealed status of specimen, the humidity and pore connectivity are more effective on the air permeability testing results by TORRENT method. And the error by TORRENT method is smaller when testing the air permeability of middle and low compacting degree concrete.
    利用細粉煤灰改善膠凝材料性能的研究
    利用細粉煤灰改善膠凝材料性能的研究
    • 楊建偉,王 強,閻培渝,施洪剛
    2012年第10期
    摘要
    引用本文
    摘 要:研究了細粉煤灰對低品質水泥性能的改善效果。結果顯示,利用細粉煤灰與低品質水泥組成的復合膠凝材料能夠較容易地配制出滿足設計要求的混凝土。由復合膠凝材料配制的混凝土在滿足抗壓強度的同時,還具有較高的劈裂抗拉強度及密實度,后期性能改善的幅度更加明顯 Abstract: The improving influence of fine fly ash on the properties of low-quality cement is investigated. The results show that concrete which meets the design requirement can be easily produced by complex binder material of low-quality cement and fine fly ash. The concrete produced by complex binder material can meet the design compressive strength, and it also has higher splitting tensile strength and higher density. Meanwhile, the late-age performance of concrete produced by complex binder material is significantly improved.
    鋰渣在LC50輕集料混凝土中的應用研究
    鋰渣在LC50輕集料混凝土中的應用研究
    • 徐芬蓮,李預奇,葉海艷
    2012年第10期
    摘要
    引用本文
    摘 要:研究了鋰渣對水泥凈漿及膠砂性能的影響,依據該基礎試驗結果,分析了鋰渣對LC50輕集料混凝土拌合物及混凝土硬化后力學性能的影響。試驗結果表明,鋰渣可以顯著改善混凝土的保水性,是一種良好的保水增稠材料,鋰渣—粉煤灰雙摻(30%)時,鋰渣的摻量為15%較為適宜,混凝土的坍落度/擴展度為270mm/690mm,28d抗壓強度為59.5MPa,滿足LC50輕集料混凝土的設計要求 Abstract: The impacts of lithium slag on the performances of cement paste and mortar are studied, and based on the test results, the effects of lithium slag on LC50 lightweight aggregate concrete mixture and the mechanical properties of hardened concrete are analyzed. The test results show that the lithium slag can significantly improve the water-holding capacity of concrete, which is a good water-thickening material. When the content of lithium slag-fly ash is 30%, the appropriate content of lithium slag is 15%, under this condition the slump/expansion of concrete is 270mm/690mm, 28d compressive strength is 59.5MPa, which can meet the design requirements of LC50 lightweight aggregate concrete.
    纖維素對砂漿性能影響微觀模型的研究
    纖維素對砂漿性能影響微觀模型的研究
    • 曹洪吉,程 麗
    2012年第10期
    摘要
    引用本文
    摘 要:研究了纖維素在不同養護濕度、不同養護方法及不同齡期下對砂漿抗折強度和抗滲性的影響,探討了纖維素砂漿復合材料的微觀模型。結果表明,摻加纖維素的砂漿后期抗折強度隨齡期的增長而增大;養護濕度增大,纖維素砂漿的抗折強度降低;纖維素砂漿應采取濕-干養護方式,纖維素能與水泥水化產物相互融合,促進其強度提高;摻加纖維素的混凝土后期抗滲性能有明顯提高。 Abstract: The effects of cellulose with different curing humidity, curing conditions and curing period on the flexural strength of mortar and anti-permeability of concrete are studied. And the microstructure model of cellulose mortar is discussed. The results show that the later flexural strength of the mortar with cellulose is enhanced with the increasing curing period, and the flexural strength of the cellulose mortar decreases with the increasing curing humidity. The cellulose and mortar can syncretize with each other to make the flexural strength increase, while taking the humid-dry curing condition for cellulose mortar. The later anti- permeability of concrete can obviously increase while adding the cellulose.
    采用萘系高效減水劑試制免蒸壓高強混凝土管樁
    采用萘系高效減水劑試制免蒸壓高強混凝土管樁
    • 田 寅1,匡紅杰1,石明正2,康曉君3
    2012年第10期
    摘要
    引用本文
    摘 要: 在優化管樁混凝土配合比的基礎上,采用萘系高效減水劑和高活性礦物摻合料生產了免蒸壓高強混凝土管樁,并將產品用于實際施工中。結果證明,該管樁的生產工藝簡單、成本較低、性能良好,對節能減排和環境保護具有重要的意義 Abstract:Base on optimizing mix proportion of the pile concrete, high strength concrete piles are produced by adding high efficiency water reducing agent(naphthalene series), high active mineral admixtures and using non-autoclaved process, and the productions are applied in the practical construction. The results show that the non-autoclaved process of the piles is simple, low cost, and the piles have good performances, which has great significance for the energy conservation and emission reduction and environmental protection.
    PHC管樁生產中的技改與創新探
    PHC管樁生產中的技改與創新探
    • 馬永錄
    2012年第10期
    摘要
    引用本文
    摘 要:以預應力高強混凝土管樁的生產工藝、工裝設備為出發點,探討了在當前資源節約型社會環境下,管樁生產企業該如何適應新時期要求全面開展節能降耗和技改創新工作。 Abstract: Base on the aspects of production technology and tooling equipments of prestressed high strength concrete piles, the pile production enterprises how to adapt the new time requests to carry out comprehensive energy consumption and technical innovation is discussed under the current society environment of resource saving.
    混雜纖維混凝土地鐵管片數值模擬研究
    混雜纖維混凝土地鐵管片數值模擬研究
    • 張 沖1,寧 博2
    2012年第10期
    摘要
    引用本文
    摘 要:在混凝土中摻入體積率分別為0.09%、0.05%的鋼纖維和聚丙烯纖維得到混雜纖維混凝土,試驗確定了混雜纖維混凝土與普通混凝土的基本參數,利用混凝土地鐵管片的數值模擬方法和試驗所得參數研究了混凝土地鐵管片的力學性能,分析比較了有限元模擬得到的結果。結果表明:在同等條件下,混雜纖維混凝土地鐵管片的承載能力高于普通混凝土地鐵管片,同時也驗證了用該數值模擬法研究混凝土地鐵管片性能的可行性。 Abstract:By mixing the steel fiber by volume ratio of 0.09% and polypropylene fiber by volume ratio of 0.05%, hybrid fiber subway concrete is prepared. The material parameters of the subway concrete and plain concrete are obtained by experiment. Then, combining with the experimental parameters, mechanical properties of the two concrete segments are researched using numerical simulation method. The research results indicate that the bearing performance of hybrid fiber concrete subway segments is higher than that of plain concrete segments, which is agree with the experimental results, and the numerical simulation method for analyzing the performance of concrete subway segments is feasible.
    新版混凝土配合比設計規程應用中的若干要點
    新版混凝土配合比設計規程應用中的若干要點
    • 馮 建
    2012年第10期
    摘要
    引用本文
    摘 要:對新版JGJ 55—2011《普通混凝土配合比設計規程》中的一些重要的修訂內容進行了闡述,并提出了在配合比設計過程中應考慮和控制的要點。對于單位體積混凝土中膠凝材料用量最大限量、礦物摻合料的摻入比例以及大體積混凝土的防裂問題提出了自己的觀點 Abstract: Some important revision contents of the new edition JGJ 55-2011《Specification for mix proportion design of ordinary concrete》are discussed, and control points during the mix proportion design are put forward. Meanwhile, some views about the maximum contents of cementitious materials for per volume of concrete, ratio of mineral admixture and cracking problem of mass concrete are presented
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