第二期_2016_《混凝土與水泥制品》雜志社

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第二期

基于壓電智能骨料的混凝土強度監測方法研究

孫威，陳佳，閻石，孫麗，黃友強

２０16年第2期

摘要

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摘要：提出一種基于壓電智能骨料的混凝土強度監測方法。將壓電智能骨料傳感器成對埋置于混凝土梁內部，對28d內各目標齡期進行信號監測試驗與立方體強度抗壓試驗。試驗結果表明，智能骨料監測信號能量值隨齡期的衰減與混凝土強度隨齡期的增加基本同步，說明智能骨料監測信號能量的變化趨勢能很好地揭示強度發展趨勢，可用于混凝土結構強度監測。對試驗數據作進一步處理得到監測信號能量比與混凝土強度百分比，二者呈良好的線性關系。 Abstract: A new method to monitoring strength of concrete based on piezoelectric smart aggregate was proposed in the paper. The piezoelectric smart aggregates were embedded in the concrete beams in pairs. Signal energy monitoring test and compressive strength test were conducted in each target age within 28d. The test results show that the attenuation of monitoring signals collected by smart aggregates synchronize the increasing of concrete strength. It proves that the variation tendency of monitoring signals can reveal the development tendency of concrete strength. The method proposed in the paper could be used to monitor the increase of concrete strength. And the energy ratio of monitoring signals and strength percentage of concrete were got by processing signals further. Excellent linearity between the energy ratio and strength percentage is achieved.

聚酰胺熱熔膠水泥砂漿的基本性能研究

袁雄洲1,3，孫偉2，邢鋒1,3，徐畏婷1

２０16年第2期

摘要

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摘??要：形狀記憶合金（SMA）驅動下熱熔膠水泥基材料具有優良的自修復能力。本文對聚酰胺熱熔膠水泥砂漿（PA砂漿）的工作性能、力學性能和耐久性能以及處于多次熱循環條件下PA砂漿的力學性能及耐久性能進行了研究。結果表明，體積摻量1%、3%和5%熱熔膠的摻入沒有降低砂漿的工作性能，反而有略微的提升；隨聚酰胺（PA）摻量的增加，砂漿的抗壓強度和抗滲性能略有下降，而抗折強度隨摻量的增加先增后減；熱循環環境中PA水泥砂漿的力學性能與耐久性能都得到了很大的提升，說明PA水泥砂漿在常溫馬氏體狀態、具有預應變的SMA的驅動下具備反復修復水泥基裂縫的潛力。Abstract:Recentresearchesresultsshowthat,whendrivenbyshapememoryally(SMA),hot-meltadhesivehavegoodself-healingproperties.Inthisarticle,theeffectsofaddingPAhot-meltadhesiveonthepropertiesofcementmortar,suchasworkingperformance,macroscopicmechanicalpropertiesanddurabilitywereinvestigated.Andthermalpropertiesofhot-meltadhesivecontainedcementmortarwerealsostudied.Experimentalresultsshowthathot-meltadhesivecanimprovetheworkabilityofmotar,andthepromotioneffectwillbeenhancedbytheincreaseofhot-meltadhesivedosage.However,theadditionofhot-meltadhesivewillleadtothedegradationofcompressivestrengthanddurability.Moreover,theappropriatecontentofthehot-meltadhesive(Vf<5%)canconsiderablyimprovetheflexuralstrengthofspecimens.Incontrasttoordinarycement-basedmaterials,macroscopicmechanicalproperties,especiallytoughness,anddurabilityofspecimenscontaininghot-meltadhesivearegreatlyenhancedafterbeingexposedtothermalcyclicenvironments.SoaconclusioncanbedrawnthatPAhot-meltadhesivemayrepaircrackincementitiousmaterialsrepeatedlycoupledwithSMA.

機制砂混凝土可泵性影響因素研究

柯國炬1，王佳茜2，田波1，李四中2

２０16年第2期

摘要

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摘??要：通過泵送阻力測定儀，測試了石粉含量、MB值、摻合料和外加劑對不同強度機制砂混凝土可泵性的影響。結果表明，低強度機制砂混凝土中，隨著石粉含量和MB值的增加，泵送阻力逐步減小，石粉含量20%時，泵送阻力最??；粉煤灰和引氣劑能有效降低泵送阻力。高強機制砂混凝土中，隨著石粉含量和MB值的增加，泵送難度增大；MB值0.25時，5%～7%的石粉含量不影響高強機制砂混凝土的泵送；相比粉煤灰和礦渣粉，硅灰更能夠有效降低高強機制砂混凝土的泵送阻力。超吸水樹脂是一種有效降低機制砂混凝土泵送阻力的外摻料。Abstract:Theeffectsofstonedustcontent,MBvalue,additivesandadmixturesonpumpabilityofdifferentmanufacturedsandcementconcreteareinvestigated.Resultsshowthat,inlowstrengthconcrete,withtheincreaseofstonepowdercontentandMBvalue,pumpingresistancereducedgradually.Whenthestonepowdercontentis20%,thepumpingresistanceistheleast.Theflyashandentrainingagentcaneffectivelyreducethepumpingresistance.Inhigh-strengthconcrete,withtheincreaseofstonepowdercontentandMBvalue,pumpingdifficultyincreasesgradually,whenpowdercontentof5%～7%andMBvaluelessthan0.7,thepumpingofconcreteisnotaffected.Comparedtoflyashandslagpowder,silicafumecaneffectivelyreducepumpingresistance.Super-absorbentresinisaneffectiveadditivetoreducetheresistanceofconcretepumping.

不同腐蝕條件下活性粉末混凝土的抗彎性能

賀奎1，王萬金1，賈方方1，路振寶1，劉俊元1，孔德成2

２０16年第2期

摘要

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摘要：采用四點彎曲試驗研究了不同腐蝕條件下鋼纖維活性粉末混凝土的抗彎性能。結果顯示，氯鹽-凍融循環耦合作用對試件的抗彎強度腐蝕作用大于凍融循環單因素的腐蝕，氯鹽-凍融耦合循環1500次后，試件的抗彎強度僅為標準養護的45.02%。由于活性粉末混凝土基體致密，腐蝕作用下，試件表面鋼纖維銹蝕，但內部鋼纖維仍能起到很好的限裂作用，基體開裂后仍能保持較好的持荷能力，抗彎試件的相對剩余強度都能達到80%以上。 Abstract: Bending properties of steel fiber reactive powder concrete under different corrosion conditions were studied by four-point bending test. Experimental results show that the corrosion of chloride salt coupling freeze-thaw cycles is greater than the freeze-thaw cycles. After 1500 times chloride salt coupling freeze- thaw cycles, bending strength of the specimens was only about 45.02% of the standard curing. Because of the compactness of reactive powder concrete, external steel fiber corrosion but the internal steel fiber can still restrict the development of cracks. Therefore, the relative residual strength of the bending specimen can keep over 80%, which shows that it has good load capacity after the matrix cracking.

廢棄陰極射線管玻璃對混凝土屏蔽性能的影響

陳炤瑀，石建軍，宋雪，劉華良，張志恒

２０16年第2期

摘要

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摘要：用占細骨料總量0、20%、40%、60%的廢棄陰極射線管（CRT）玻璃分別和100%、80%、60%、40%的普通河砂、磁鐵礦砂配制出兩種不同細骨料混凝土試件，進行了坍落度、抗壓強度、γ射線屏蔽性能的測試。結果表明，隨著細骨料中CRT廢玻璃比例的提高，新拌混凝土坍落度隨之變大，28d立方體試塊抗壓強度有所降低，混凝土對γ射線的屏蔽效果逐漸增強；當CRT在普通河砂混凝土中摻量達到60%時，配制出的混凝土屏蔽能力接近100%磁鐵礦砂混凝土，說明CRT玻璃可以作為一種新型防輻射材料，為防輻射混凝土的研究提供一定參考。 Abstract: Using waste cathode ray tube (CRT) glass which is accounting for 0, 20%, 40%, 60% of total fine aggregates, respectively, with 100%, 80%, 60%, 40% of the ordinary river sand, magnetic iron ore, two different fine aggregate concrete specimens are prepared. For above concrete, the specimens slump, compressive strength, γ-ray shielding performance tests are carried out. The results show that with fine aggregate in a higher proportion of CRT, fresh concrete slump becomes larger, 28d compressive strength becomes smaller, shielding performance of concrete increases. When the CRT content reaches 60% of ordinary river sand concrete, the concrete shielding capacity is closed to 100% magnetic iron ore concrete, which indicate that CRT can be described as a new radiation shielding material for the study of radiation concrete.

高強鋼渣混凝土的電學及力學性能研究

王虹1，郭麗萍1,2,3，孫偉1,2,3，馬瑞1，楊亞男1

２０16年第2期

摘要

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摘要：通過對磨細鋼渣粉的物理性質和化學成分分析，發現磨細鋼渣粉中含有較高的金屬氧化物，且活性指數高達107%。本文選用磨細鋼渣粉作為導電相材料，以磨細鋼渣粉取代水泥作為膠凝材料來制備鋼渣混凝土。試驗結果表明，隨著鋼渣粉取代量的增加，鋼渣混凝土的電阻率明顯下降，具有良好的導電性能；當鋼渣粉取代水泥質量的10%~40%時，鋼渣混凝土的抗壓、抗折強度呈非線性增大，抗壓強度最高可達92.1MPa。說明鋼渣混凝土具有高強度和低電阻率的特征。 Abstract: According to the analysis of physical properties and chemical components of the steel slag fine powder, the powder contains a high content of metal oxide and the activity index reaches as high as 107%. The steel slag fine powder is chosen as conductive paste materials here to replace cement as cementing material for preparing steel slag concrete. Result of the experiment indicates that with the increase of replacing quantity of steel slag powder, the electrical resistivity of the steel slag concrete declines significantly and good electrical conductivity is gained. When 10%~40% of the cement is replaced by steel slag powder, the compressive strength and flexural strength of steel slag concrete increase in a nonlinear way and the compressive strength can reach 92.1MPa at the highest. The results show that steel slag concrete is featured with high strength and low resistivity.

不同工藝粉煤灰與外加劑適應性及機理分析

沙建芳，徐海源，陸加越，郭飛

２０16年第2期

摘要

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摘??要：采用凈漿流動度方法，較為系統地研究了普通低鈣灰、高鈣灰、粉磨灰、脫硫灰、脫硝灰與萘系、聚羧酸減水劑的適應性，并通過SEM微觀形貌、表觀吸附及Zeta電位測試，初步分析了不同粉煤灰與外加劑適應性差異的原因。結果顯示，粉煤灰對不同外加劑具有明顯的選擇性和適應性，外加劑摻量與粉煤灰需水量比正相關但無正比例關系；與普通低鈣灰相比，脫硝灰具有同等的減水、保塑作用甚至更優，與外加劑適應性良好，粉磨灰、脫硫灰對初始摻量和經時流動性均有顯著負效應，與外加劑適應性差；高鈣灰與外加劑適應性不佳主要表現為增大經時損失；微觀結構特性及未燃碳含量影響粉煤灰對外加劑的吸附和Zeta電位，從而影響不同粉煤灰與外加劑的適應性，高鈣灰、脫硝灰具有與普通粉煤灰相似的微觀形貌，對外加劑飽和吸附量小，因而適應性良好；粉磨灰、脫硫灰的粗糙表面以及較高含碳量造成大量外加劑的無效損耗，從而嚴重弱化外加劑與其適應性。Abstract:Theadaptabilityoflow-calciumflyash,high-calciumflyash,groundflyash,desulfurizedflyash,denitrifiedflyashwithnaphthaleneandpolycarboxylicsuperplasticizerwassystematicresearchedbycomparingcementpastefluiditymethod.ThedifferencesofadaptabilitybetweenflyashandadmixturesareanalyzedthroughSEM,adsorptionandZetapotentialexperiments.Theresultsshowthattheflyashhashighselectivityandadaptabilitytodifferentadmixturesobviously.Theamountofadditiveispositivelycorrelatedtowaterdemandratio,butnotexistedaproportionalrelationship.Comparedwithlow-calciumflyash,denitrifiedflyashcanadaptadditiveswellbyfinewater-reducing,slump-remainingcharacteristicorevenbetterintheseaspects.Groundflyashanddesulfurizedflyashhavebadadaptabilitytoadditivesbecausetheyhaveanegativeeffectoninitialfluidityandfluidityretaining.High-calciumflyashalsocan’tadaptadditiveswellbecauseitmakestheslumplossaggravated.ThemicrostructureandunburnedcarboncontentdeterminedtheadaptabilityofdifferentflyashandadmixturesthroughtheeffectonadsorptionandZetapotentialproperties.High-calciumflyashanddenitrifiedflyashcanadaptadditiveswellbecausetheyhavethesimilarmicromorphologyandadsorptionperformancetoordinaryflyash,whilegroundflyashanddesulfurizedflyashhavebadadaptabilitytoadditivesforitsroughsurfaceandhighcarboncontentincreasedadditivesseriousloss.

聚羧酸減水劑在PHC管樁混凝土中的應用研究

余韜，王毅，李楠，王幸福，石宇

２０16年第2期

摘要

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摘要：從聚羧酸減水劑合成設計的角度，研究了AMPS和HEA不同摩爾比對聚羧酸減水劑性能的影響。同時對比了聚羧酸減水劑和萘系減水劑在混凝土強度、收縮率、抗硫酸鹽侵蝕方面的性能差異。結果表明：AMPS隨著摩爾比的增加，可以有效提升減水劑的分散性，并能降低漿體黏度，表現為余漿含固量的降低，此外，還能縮短混凝土的凝結時間；HEA可以提升減水劑的保持能力，但會增加混凝土的含氣量。聚羧酸減水劑與萘系減水劑的對比試驗表明，聚羧酸減水劑相比于萘系減水劑有更高的減水率以及更好的耐久性能。 Abstract: From the perspective of PCE synthesis design, the effect of different mole ratio of AMPS and HEA on the performance of PCE as well as the difference performance of concrete compressive strength, shrinkage rate and sulfate resistance between PCE and FDS are studied. The results show that with the increasing of the molar ratio of AMPS, the dispersion of the PCE is improved, and it can decrease the viscosity of the slurry, which is reflected in the reduction of the amount of residual pulp, and shorten the setting time of the concrete. HEA can improve the capacity of the PCE, but it will be increase the air content of concrete. Compared with FDS, the result show that PCE has a higher water reducing rate and better durability.

長江口疏浚淤沙制作工程預制品的示范生產與應用

李陽

２０16年第2期

摘要

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摘要：以橫沙東灘促淤圈圍項目為工程背景，就地利用長江口疏浚淤沙作為骨料，開發用于促淤圈圍工程的扭王塊和護坡塊體等工程預制品。示范生產和應用結果表明，以淤沙為原材料生產工程預制品，技術上可行，生產成本低，且混凝土工程預制品的強度和耐久性都符合工程要求。 Abstract：Taking Hengsha East Shoal promoting sedimentation and land reclamation project as the background and using of the Yangtze River Estuary dredged silt as aggregate, the wrest block and revetment block engineering prefab products are developed. The demonstration production and application results show that using dredged silt as raw materials to product engineering prefab products is technically feasible, which has low production cost, and the strength and durability of engineering products can meet the engineering requirements.

預制混凝土異形塊體成型關鍵工藝及力學性能研究

褚云朋，王嶸，古松，姚勇

２０16年第2期

摘要

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摘要：通過對預制混凝土異形塊體關鍵成型工藝控制，以保證塊體制作質量及結構裝配的可實施性?；谠囼炑芯考坝邢拊７治?，研究了單個塊體受壓力學性能及塊體間相互作用后的力學性能，給出了裂縫發展趨勢，確定出了薄弱位置，并建議應在豎向開孔位置加配鋼筋，以避免因過早裂縫形成及開展導致的塊體失效，降低塊體承載力。 Abstract: The key forming processes of prefabricated self-locking concrete abnormal blocks are controlled to ensure quality and assembly structure. Based on the experimental study and finite element simulation method, the mechanical properties of a single block and between blocks after the mechanical properties of interaction are studied, crack development is given, and the weak position is determined, which recommends the vertical opening position should be arranged reinforcement to avoid premature cracks due to the failure to carry out the block, reduce block bearing capacity.

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