第四期_2017_《混凝土与水泥制品》杂志社

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第四期

重金属复合污染土免烧砖的制备与研究

吕浩阳，王喜彬，王爱勤

２０17年第4期

摘要

引用本文

摘要：在对白银市东大沟Pb、Zn、Cd复合污染土壤基本理化性质分析的基础上，进行了制备免烧砖的初步研究，探讨了不同水泥用量对免烧砖抗压强度和浸出毒性的影响,分析了砖体在不同pH值环境下的安全性，并对固化前后污染土中重金属形态进行了对比分析。结果表明，水泥对Pb、Zn、Cd具有良好的固化效果。随着水泥添加量的提高，砖体抗压强度呈上升趋势。与原土相比，砖体中重金属在不同pH值溶液浸提下，浸出趋势不变，浸出浓度显著下降，重金属酸可提取态部分所占比例显著下降，残渣态上升。 Abstract: Based on the analysis of the basic physical and chemical properties of Pb, Zn, Cd contaminated soils of Dongdagou in Baiyin, the preparing of non-burned brick was studied. The effect of cement addition on compressive strength and leaching toxicity was discussed. The stability under different pH was analyzed and the distribution of heavy metals in soil before and after solidification was compared. The results showed that the cement has good curing effect on Pb, Zn and Cd. The compressive strength of brick improves as the increasing of cement. Compared with raw contaminated soils, the heavy metal leaching trend in brick in different pH leaching liquor does not change, but the leaching concentration decreases. The acid extractable of heavy metal in brick decreases, residual form increases.

吕浩阳,王喜彬,王爱勤.重金属复合污染土免烧砖的制备与研究[J].混凝土与水泥制品,2017(4):91-94. LYU H Y, WANG X B, WANG A Q.Preparation and Research on Non-burned Brick Used by Heavy Metal Contaminated Soils[J].China Concrete and Cement Products,2017(4):91-94.

低负温型管道压浆料工艺性能研究

朱清华1，费伟全2，谢松1

２０17年第4期

摘要

引用本文

摘要：分析了低负温型管道压浆料的技术原理，研究了水灰比、浆体温度、风速、搅拌时间以及储浆罐容积等对凝结时间及流动度经时损失的影响。通过制定合理的压浆施工工艺，以及预应力混凝土梁模拟灌浆后降温试验，验证了管道压浆冬季施工的可行性。 Abstract: The technical principle of low negative temperature pipeline slurry was analyzed, the effects of water cement ratio, slurry temperature, wind speed, stirring time and storage tank volume on the setting time and the loss of fluidity over time were studied. The reasonable process on pressure grouting construction and the test of the prestressed concrete beam to simulate the cooling after grouting were carried out to verify the feasibility of pipeline grouting winter construction.

朱清华,费伟全,谢松.低负温型管道压浆料工艺性能研究[J].混凝土与水泥制品,2017(4):88-90+94. ZHU Q H, FEI W Q, XIE S.Study on Processing Performance of Low Negative Temperature Pipeline Slurry[J].China Concrete and Cement Products,2017(4):88-90+94.

沿海地区桥梁超大零号块裂缝控制技术

房艳伟1，张炼国2，刘可心1，吴柯1

２０17年第4期

摘要

引用本文

摘要：某大桥主墩零号块结构尺寸大，采用C55混凝土，收缩大，施工过程中处理不当极易出现裂缝，在混凝土配合比优化设计的基础上，依据温度场及温度应力场仿真计算结果制定了相应的温控标准，并通过原材料温度控制、混凝土掺加碎冰拌和、液氮预冷混凝土、埋设冷却水管通水冷却等措施，使该零号块箱梁未出现有害温度裂缝，达到了预期的温度控制效果。 Abstract：Due to the large structure size of zero block of some river bridge, the concrete is easy to crack in construction when using C55, based on the optimization of concrete mix proportion, the standard of temperature controlling was made according to the result of temperature and thermal stresses distribution of mass concrete. By controlling materials temperature, mixing concrete with ice, cooling concrete with liquefied nitrogen and applying recycling cool water, harmful cracks was not appeared in mass concrete of ultra large zero block of the river bridge and anticipated temperature control requirements was achieved.

房艳伟,张炼国,刘可心,等.沿海地区桥梁超大零号块裂缝控制技术[J].混凝土与水泥制品,2017(4):85-87. FANG Y W, ZHANG L G, LIU K X,et al.Cracks Controlling Technology of Ultra Large Zero Block for Bridge in Coastal Area[J].China Concrete and Cement Products,2017(4):85-87.

C60自密实钢管柱顶升混凝土的配制与施工

臧军1，沈晓冬1，赵峰2

２０17年第4期

摘要

引用本文

摘要：通过大批量的试配以及在生产过程中对混凝土配合比的实时调整，实现了南京世界贸易中心C60自密实钢管柱顶升混凝土工程的顺利施工。在生产过程中不断调整胶凝材料用量、碎石级配及圆整度；同时检测混凝土在出机、入泵及出泵时的工作性能以及振捣方式对混凝土试块强度的影响。工程实践表明，出泵时混凝土工作性能满足施工要求，振捣方式对自密实混凝土的强度影响较小。 Abstract: World Trade Centre Nanjing was constructed by self-compacting concrete through lift-up technology of C60 steel tubes, which performed as planned through a number of tests and real-time adjusting of concrete mixture ratio on site. During the construction, binding material consumption, gravel gradation and roundness were adjusted to guarantee progress; when the concrete was out of the mixer, pumping-in and pumping-out, the working performance were supervised at every step. The results show that the working performance of concrete meets the construction demands when pumped out. The vibrating method has little influence on the strength of self-compacting concrete.

臧军,沈晓冬,赵峰.C60自密实钢管柱顶升混凝土的配制与施工[J].混凝土与水泥制品,2017(4):81-84. ZANG J, SHEN X D, ZHAO F.Preparation and Construction of C60 Steel Tubes Self-compacting Concrete through Lift-up[J].China Concrete and Cement Products,2017(4):81-84.

混凝土抗压强度现场检测技术方法研究现状及发展方向

侯高峰1,2

２０17年第4期

摘要

引用本文

摘要：对目前混凝土强度检测领域常用技术方法研究现状进行了分析，总结和比较了不同检测技术方法的优缺点，探讨了混凝土抗压强度检测技术方法的研究发展方向，认为宜采用局部破损修正非破损的检测方法可更准确推定混凝土抗压强度，更好地服务于工程质量，并确保结构安全。 Abstract: The advantages and disadvantages of different detection methods of commonly concrete strength testing is analyzed, summarized and compared, the developing direction of concrete compressive strength testing technology and methods is discussed, the results show that using local damage detection method provide more accurate estimation of concrete compressive strength, which can better service in the engineering quality and ensure the structure safety.

侯高峰.混凝土抗压强度现场检测技术方法研究现状及发展方向[J].混凝土与水泥制品,2017(4):76-80. HOU G F.Research Status and Development Direction of Concrete Compressive Strength Testing Method[J].China Concrete and Cement Products,2017(4):76-80.

陶瓷微珠在轻质高强保温砂浆中的应用研究

曾兴华，吴炎平，朱群敏，方春霖

２０17年第4期

摘要

引用本文

摘要：陶瓷微珠具有质轻、导热系数低的特点，目前主要应用于建筑反射隔热涂料中，采用热线法导热系数仪测试其导热系数为0.0350W/（m·K），比玻化微珠和膨胀珍珠岩导热系数低20%～30%，干密度为78kg/m3，有利于制备轻质高强、保温性能好的保温砂浆。为降低保温砂浆的导热系数，通过复掺少量陶瓷微珠和聚苯颗粒，制备的保温砂浆的干密度为228kg/m3，28d抗压强度为0.4MPa，导热系数为0.060W/（m·K），除干密度稍偏高外，其它主要性能指标满足GB/T10303—2001《膨胀珍珠岩绝热制品》中200号优等品标准要求。Abstract:Ceramicbeadshavethecharacteristicsoflightweightandlowthermalconductivity,itismainlyusedinarchitecturalreflectivethermalinsulationcoatings.Thethermalconductivitycoefficientis0.0350W/(m·K)，whichis20%～30%lowerthanthatofglazedhollowbeadandexpandedperlite.Thedrydensityofceramicbeadsis78kg/m3,whichisbenefitforthepreparingofthermalinsulationmortarwithgoodthermalinsulationproperty.Toreducetheconductivitycoefficientofthermalinsulationmortar,thethermalinsulationmortarwaspreparedbymixingwithsmallamountofceramicbeadsandpolystyreneparticles,whosedrydensityis228kg/m3,the28dcompressivestrengthis0.4MPa,andthethermalconductivityis0.060W/(m·K).Inadditiontotheslightlyhigherdrydensity,theothermainperformanceindexesmeettherequirementsofgrade200superiorproductofGB/T10303—2001.

曾兴华,吴炎平,朱群敏,等.陶瓷微珠在轻质高强保温砂浆中的应用研究[J].混凝土与水泥制品,2017(4):72-75. ZENG X H, WU Y P, ZHU Q M,et al.Application Study on Ceramic Beads in Thermal Insulation Mortar with Light Weight and High Strength[J].China Concrete and Cement Products,2017(4):72-75.

纤维素醚对普通砂浆保水性能的影响

徐迅，郝益，郑成章

２０17年第4期

摘要

引用本文

摘要：研究了不同黏度不同掺量的羟丙基甲基纤维素（HPMC）对普通砂浆（砌筑砂浆、抹面砂浆）保水性能的影响。研究发现，HPMC能大幅提高砂浆的保水性，较大改善砂浆的施工性能，其合适掺量为0.4‰～0.5‰。在相同黏度不同掺量的HPMC条件下，砂浆的用水量基本保持不变，表观密度略有增加，保水率随着HPMC用量的增加而增加。在不同黏度相同掺量的HPMC条件下，砂浆的用水量同样基本一致，表观密度也是略有增加，保水率随着HPMC黏度的增加而增加。Abstract:Theinfluenceofdifferentviscosityanddosagehydroxypropylmethylcellulose（HPMC）onwaterretentioncapacityforordinarymortarwasstudied,includingmasonrymortar,pointingjointmortar.TheresultsshowthatHPMCcansignificantlyimprovethewaterretentioncapacityofmortarandtheworkabilityofthedry-mixedmortar,andthesuitabledosageis0.4‰～0.5‰.WhenthedosageofHPMCisdifferentandtheviscosityissame,thewaterconsumptionofcementmortarbasicremainsunchanged,volumeweightslightlyincreases,andwaterretentioncapacityincreaseswithdosageincreaseofHPMC.WhentheviscosityofHPMCisdifferentandthedosageissame,thewaterconsumptionofcementmortarbasicremainsunchanged,volumeweightslightlyincreases,andwaterretentioncapacityincreaseswithviscosityincreaseofHPMC.

徐迅,郝益,郑成章.纤维素醚对普通砂浆保水性能的影响[J].混凝土与水泥制品,2017(4):69-71. XU X, HAO Y, ZHENG C Z.Influence of Cellulose Ether on Water Retention of Mortar[J].China Concrete and Cement Products,2017(4):69-71.

结合面处理对加大截面加固梁的力学性能研究

李祖辉，许振华

２０17年第4期

摘要

引用本文

摘要：增大截面法加固的钢筋混凝土梁属于新旧材料二次组合梁，能否成为一个整体，关键取决于结合面能否充分传递剪力。为了确保新旧混凝土协同工作，剪力可靠传递，达到良好的加固效果，本文通过对三种不同结合面处理加固梁的力学性能进行了研究。结合面粘贴钢丝网的处理方式，可以改善梁的受力性能，提高梁的承载力，加固效果好。 Abstract: Reinforced concrete beams reinforced by section enlargement method are new composite beams of old and new materials, whether they can become a whole, it depends on the joint surface whether it can fully transfer shear. In order to ensure the old and the new concrete working together, transfering shear reliably, and reaching a good reinforcement effect, the mechanical properties of reinforced beams strengthened by three different bonding surfaces are studied. The method of bonding steel wire mesh on the surface, which can improve the beam performance and the bearing capacity of the beam and achieve a good reinforcement effect.

李祖辉,许振华.结合面处理对加大截面加固梁的力学性能研究[J].混凝土与水泥制品,2017(4):64-68. LI Z H, XU Z H.Effecting Research of Junction Surface Treatment on Mechanical Properties of Enlarging Section Reinforced Beams[J].China Concrete and Cement Products,2017(4):64-68.

影响活性粉末混凝土强度和干缩性能的因素研究

张磊1,2，吕淑珍3，罗盛鲜3，朱江花4

２０17年第4期

摘要

引用本文

摘要：研究了水灰比、玄武岩纤维掺量、纤维长度及养护制度等对活性粉末混凝土（RPC）早期强度和干缩性能的影响。研究结果表明，90℃蒸汽养护2d时，RPC强度随着水灰比的增加逐渐降低，自然养护至28d时，RPC强度出现倒缩现象，当水灰比为0.17时，RPC28d强度为132.3MPa，干缩率为5.1×10-3。当纤维掺量为1.0%，长度为6mm时，RPC28d抗压强度为135.7MPa，干缩率为1.3×10-3；90℃蒸养2d的RPC试件，28d强度最高，干缩最小。Abstract:Theinfluencesofwater-cementratio,basaltfiberdosage,fiberlengthandcuringsystemontheearlycompressivestrengthandshrinkageperformanceofRPCarestudied.Theresultsshowthat,after90℃curing24h,thestrengthofRPCisdecreasedwiththeincreaseofthewater-cementratio.Whenthenaturecuringisto28d,themortarstrengthisdecreasedandwhenthewater-cementratiois0.17,theshrinkagerateis5.1×10-3.Whenthefiberdosageis1.0%,lengthis6mm,the28dcompressivestrengthofRPCis131.9MPa,theshrinkagerateis1.3×10-3.When90℃curing2d,theRPChasahigherstrengthandlowerdryshrinkage.

张磊,吕淑珍,罗盛鲜,等.影响活性粉末混凝土强度和干缩性能的因素研究[J].混凝土与水泥制品,2017(4):58-63. ZHANG L, LYU S Z, LUO S X,et al.Study on Affecting Factors of Strength and Shrinkage Performance of Reactive Powder Concrete[J].China Concrete and Cement Products,2017(4):58-63.

短切玄武岩纤维桥联作用对湿喷混凝土力学性能的影响

韩振宇，陈新明，焦华喆，孙冠东，刘子璐

２０17年第4期

摘要

引用本文

摘要：通过抗拉、抗压及抗弯性能试验，研究了20mm短切玄武岩纤维对喷射混凝土力学性能的影响规律。结果表明，玄武岩纤维体积掺量在3kg/m3时，玄武岩纤维混凝土的力学性能最优，抗压、抗拉、抗折强度的增幅可达33％、23％、40％，掺量再增加时力学性能下降。端钩型钢纤维掺量为20kg/m3时对混凝土各项力学性能的增幅仅为6%～8%，其效果弱于最佳掺量的玄武岩纤维混凝土。混凝土开裂后，乱向分布的纤维会将力传递到裂缝两侧的表面，使裂缝的发展得到抑制，试件可以继续受力，玄武岩纤维的桥联作用对抑制湿喷混凝土开裂有较大的帮助。Abstract:Thetensile,compressiveandflexuraltestwerecarriedouttostudytheinfluencethat20mmshortBFhasonmechanicalpropertiesandmechanismofsprayedconcrete.TheresultsshowedthatwhentheBFvolumeis3kg/m3,ithastheoptimalmechanicalproperties.Theincreaseofcompressivestrength,tensilestrengthandflexuralstrengthreaches33%,23%and40%respectively.ThemechanicalpropertiesofBFRCweredecreasedwhenthedosagecontinuestoincrease.Whentheendhooktypesteelfibercontentis20kg/m3,themechanicalpropertiesofconcreteincreasedbyonly6%～8%,theeffectisweakerthantheoptimumdosageofBFRC.Aftercracking,therandomdistributionfiberwilltransfertheforcetothesurfaceofbothsidesofthecrack,thedevelopmentofthecrackcanberestrained,specimencancontinuetobearforce.ThebridgingeffectofBFhasgreathelponinhibitionofwetsprayedconcretecracking.

韩振宇,陈新明,焦华喆,等.短切玄武岩纤维桥联作用对湿喷混凝土力学性能的影响[J].混凝土与水泥制品,2017(4):54-57. HAN Z Y, CHEN X M, JIAO H Z,et al.Influence of Short Basalt Fiber Bridging on Mechanical Properties of Sprayed Concrete[J].China Concrete and Cement Products,2017(4):54-57.

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