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.

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.

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.

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.

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.

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.