第三期_2010_《混凝土與水泥制品》雜志社

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第三期

蒸養參數對高強混凝土抗硫酸鹽侵蝕性能的影響

田耀剛1,2 ，彭波3 ，丁慶軍4 ，胡曙光4

２０10年第3期

摘要

引用本文

摘要：以硫酸鹽侵蝕環境中混凝土抗壓強度損失為評價指標，結合壓汞測孔技術，研究了靜養時間、升溫速度、恒溫時間和恒溫溫度等蒸養參數對高強混凝土抗硫酸鹽侵蝕性能的影響。研究結果表明，與標準養護相比，蒸養可導致混凝土抗硫酸鹽侵蝕性能明顯劣化；靜養時間的延長對高強混凝土抗硫酸鹽侵蝕性能有明顯的改善作用，而過快的升溫速度、較長的恒溫時間及較高的恒溫溫度均對混凝土的抗硫酸鹽侵蝕性能有不利影響。 Abstract: According to the evaluation indexes of concrete compressive strength loss in sulfate erosion environment and MIP(Mercury Intrusion Pressure) testing technology, the influence of rest period，heating rate，thermostatic period and temperature on the sulfate resistance of steam-cured high strength concrete is studied. The results indicate that the sulfate resistance performance of steam-cured high strength concrete is worse compared with that cured in standard conditions; the sulfate resistance of steam-cured high strength concrete is obviously improved with a longer rest period，but it is undermined with a rapid heating rate，a longer thermostatic period or a higher thermostatic temperature.

低CO2濃度下混凝土的加速碳化試驗研究

明靜，張亞梅

２０10年第3期

摘要

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摘?要：選用CO2體積濃度為3%的低濃度碳化試驗研究了水膠比及粉煤灰與礦粉單雙摻對混凝土碳化性能的影響。通過對比試驗，分析了低CO2濃度下碳化深度與抗壓強度之間的相關性，并采用XRD研究了混凝土的碳化產物，顯示了物相分析結果與碳化試驗結果的一致性。結果表明，低濃度碳化試驗結果能很好反映理論規律，并且碳化周期長時與抗壓強度之間具有較好的對應關系。進行低濃度加速碳化試驗時，建議采用混凝土的碳化齡期為90d。XRD分析表明，混凝土的碳化速率與其內部可碳化物質CH的含量密切相關。Abstract:Theeffectofwatertobinderratio，flyashandslagonthecarbonationofconcreteisinvestigatedwithlow-concentration(3%CO2involume)carbonationtestmethods.Therelationbetweenthecarbonationdepthandcompressivestrengthisanalyzedbycontrasttests.TherelativeintensityofcarbonationproductsCaCO3isdeterminedbyX-raydiffraction(XRD)analysis.ItisrevealedthatcarbonationresultsunderlowCO2concentrationcoincideswellwiththeoreticallaws.Thereisagoodrelationshipbetweencarbonizationdepthandcompressivestrengthofconcretewhenthecarbonationtimeislongenough.ThecarbonationdurationunderlowCO2concentrationisproposedat90days.ItcanalsobeconcludedthatcarbonationrateofconcreteiscloselyrelatedtocarbonizablesubstanceCH.

堿激發錳渣礦渣膠凝材料的力學性能及水化過程研究

宋旭艷1，楊末麗2，韓靜云1，郜志海1

２０10年第3期

摘要

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摘??要：利用基于水玻璃形成的復合堿組分SN和少量硅酸鹽水泥共同激發錳渣－礦渣體系，制備出堿激發膠凝材料，并對該膠凝材料的力學性能及水化過程進行了探討。結果表明：水化3～7d內是該堿激發膠凝材料中錳渣與礦渣的適應性由劣向好轉變的關鍵。水化初期（3d前），隨著礦渣替代錳渣量增加，堿激發膠凝材料中生成水化產物的程度變慢，抗壓強度降低；水化7d后，堿激發錳渣－礦渣膠凝材料中隨著礦渣替代量的增加，石英（SiO2）被剝蝕解體量增多，體系的溶解－聚合程度逐漸提高，水化產物逐漸增多，化學結合水量逐漸增大，抗壓強度逐漸提高。Abstract：Withmanganeseslagandslagactivatedbycompoundalkalibasedonwaterglassandalittlecement,alkali-activatedcementitiousmaterialscanbemade.Andthemechanicalpropertyandhydrationprocessofalkali-activatedmanganeseslagandslagcementitiousmaterialsarestudied.Theresultsshowthat:athydrationageof3d～7d,theadaptabilityofmanganeseslagandslaginalkali-activatedcementitiousmaterialscanchangefromthepoortothebetter.Withthepercentageofslagincreasing,whichisinsteadofmanganeseslaginalkali-activatedcementitiousmaterials,atearlyageofhydration(before3d)，moreslowlythedegreeofhydrationproductsgeneratedmaybeandthelowercompressivestrengthcanbe.After7d,disintegrationanderosionofquartzactgreatly,andthedegreeofsolutionandcombinationinthesystemcangraduallyincrease,andhydrationproductscanbeontheincrease,andtheamountofchemicallycombinedwatercanincreasegradually,andcompressivestrengthofalkali-activatedmanganeseslagandslagcementitiousmaterialscangraduallyrise.

表面能對砂漿斷裂能、強度及收縮性能的影響

任昭君1，孫志偉2，蘇卿3

２０10年第3期

摘要

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摘要：以水泥砂漿為研究對象，對不同水分含量及不同表面張力溶液下砂漿的斷裂能、強度及收縮膨脹性能進行了研究。試驗結果表明：砂漿的斷裂能、強度隨著水分含量的增加和浸泡液體表面張力的增大而減小，在全干燥狀態下砂漿的表面能最大，相應的斷裂能和強度也最大。海水浸泡后砂漿斷裂能及強度顯著降低。隨著浸泡液體表面張力的增大，砂漿的膨脹應變線性增大。 Abstract: Fracture energy, strength, shrinkage and expansion properties of cement mortar are studied under different moisture content and surface tension solutions. Results indicate that the fracture energy and strength of mortar are lower according to moisture content and surface tension of immersion liquids increasing. Under total drying condition, the surface energy of mortar is highest, and the fracture energy and strength are maximal too. After seawater immersion, the fracture energy and strength of mortar decreased significantly. The swelling strain of mortar increases linearly with the increase of surface tension of immersion liquids.

C60高拋鋼管自密實混凝土的研究及應用

楊善順

２０10年第3期

摘要

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摘??要：通過原材料的選擇和配合比優化，進行了施工模擬試驗與分析，成功配制了C60鋼管自密實混凝土，并在廈門怡山商業中心項目中得到了良好應用，滿足了工程中對混凝土的技術要求。

甬臺溫客運專線黃毛山隧道帷幕注漿施工技術

黃旭升

２０10年第3期

摘要

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摘??要：通過超前地質預報對黃毛山隧道Ⅳ級圍巖地段DK152+000～DK152+050區段的工程地質和水文地質進行評估和預測，按照“以堵為主，限量排放”的原則，采用帷幕注漿進行堵水加固圍巖以保證施工安全。通過現場試驗確定了帷幕注漿技術參數，并通過在工作面鉆注漿孔,再向孔內壓注水泥（或水泥-水玻璃等）漿液，漿液將一定范圍內圍巖裂隙中的水擠出，保證圍巖裂隙被具有一定強度的混合漿體充填密實,并與巖體固結成一體，形成了止水帷幕，為黃毛山隧道的安全生產、順利貫通打下了堅實基礎。Abstract:WithgeologicalpredictionforthegradeⅣrocksectionsofHuangMaoShantunnelofengineeringgeologyandhydro-geologicalassessmentandpredictioninDK152+000~DK152+050paragraphs,inaccordancewiththe"block-based,limiteddischarge"principle,thecurtaingroutingtechnologyisusedforwatershut-offreinforcedrockinordertoensureconstructionsafety.Thetechnicalparametersofthecurtaingroutingaredeterminedthroughon-sitetesting.Andbygroutingholesdrilledthroughthefaceandpressureinjectionofcement(orcement～sodiumsilicate,etc.)slurryintheholes,thewaterinrockgapisextrudedinacertainrangebyslurrytoensurerockgapfilledwithcertainstrengthmixedslurry,andtoconsolidatewithrockmasstoformwaterproofcurtain,whichlayedasolidfoundationforsafeproductionandsuccessfultransfixionofHuangMaoShantunnel.

改性聚氨酯用于高速公路瀝青路面裂縫修復的應用研究

鄧劍濤

２０10年第3期

摘要

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摘要：通過對高速公路瀝青路面產生開裂的原因分析，研究了一種對瀝青和水泥混凝土都具有粘結強度，并且具有高延展、防水性能的改性聚氨酯材料。介紹了一種操作方便、工期短、對交通影響小的施工方法，達到了有效、方便、快速修復高速公路瀝青路面裂縫的目的。 Abstract: With the analysis on the crack reason of expressway asphalt pavement, a kind of modified polyurethane material is studied, which has not only bond strength to asphalt and cement concrete, but also high prolonged and waterproof performance. The construction method, which is easy operating, short construction period and less effective to transportation, is introduced. And the purpose of effectively rapid repairing the crack of expressway asphalt pavement is reached.

埋地剛性管道上的地面荷載計算

闕小平，李平木

２０10年第3期

摘要

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摘要：針對埋地剛性管道上作用的地面荷載，明確附加荷載與堆積荷載的區別，并對幾種計算方法進行分析和算例計算，提出了地面荷載計算時應明確的參數，得出了不同荷載條件下適用的計算方法。 Abstract：For the role of buried rigid pipes on the ground load, the difference between additional load and accumulated load is studied，and through several calculation methods analysing and examples calculating, the clear parameters for ground load calculations are proposed，and the applicable calculation methods under different load conditions are gained.

大直徑混凝土管片氣泡的防治研究

姜俊1，王曉棟1，孔德玉2，潘鳳英1，徐勇1

２０10年第3期

摘要

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摘要：混凝土管片是盾構隧道的主要結構構件，也是隧道防水、防火和耐久等綜合性能的保證，因此，對管片整體性能有著極高要求。但大直徑混凝土管片在生產中易出現較多氣泡，從而易形成滲漏通道，影響管片的耐久性。本文從混凝土原材料、配合比設計、模具、脫模劑、振搗工藝等方面入手，試驗摸索出減少管片氣泡的一套方法，在生產實踐中收到了較好的效果。 Abstract: Concrete segments are the main structures of shield tunnel，they are also the comprehensive performance guarantees of waterproof, fireproof and durability. Therefore, the overall performance of the segment has a high requirment. But the large-diameter concrete segment in the production sometimes happens more bubble，thus it is easy to form leakage channels，which affects the durability. In this paper, concrete materials, mix design, mould, mold release agents, vibration technology and other aspects attempt to reduce the segment bubble, as a result, good results are gotten in the practice production.

PHC管樁預應力傳遞性能試驗研究

吳鋒1,2，邱松1，卓楊1，丁捍東1

２０10年第3期

摘要

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摘要：根據先張法預應力混凝土管樁（PHC）鐓頭釋放、切割、大錘鑿樁和風鎬鑿樁等不同截樁方式試驗研究，分析了截樁方式對PHC管樁預應力傳遞長度的影響，并通過現場試驗和理論分析，確定了PHC管樁截樁后的預應力傳遞長度，為設計提供了可靠的試驗依據。 Abstract: To carry out a experimental research on pretensioned prestressed concrete pile by different pile cut-off ways such as end release, cutting, sledge hammer chisel and pneumatic pick etc., the influence of different cut-off ways on its prestressed transfer length of PHC piles is studied. Meanwhile, the prestressed transfer length after cut-off has been determined through field tests and theoretical analysis, which provides a reliable basis for design.

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