摘 要：测试了上海市某电厂普通粉煤灰和脱硝粉煤灰烧失量、强度活性指数、化学组成、矿物组成及微观形貌等测试，研究了脱硝粉煤灰性能及其与普通粉煤灰的差异，模拟分析了高温煅烧前后高氮含量脱硝粉煤灰基本性能和力学性能变化。研究表明，正常工况下，采用同一煤种的脱硝粉煤灰的需水量比、烧失量、化学组成、矿物组成类型、外观以及微观形貌与普通粉煤灰相似；提出脱硝再燃烧，高氮脱硝粉煤灰经高温煅烧后烧失量、氮含量、三氧化硫含量分别降低38%、98%和53%，28 d抗压强度提高7.7%。 Abstract: The ordinary fly ash and denitration fly ash are assessed by testing the loss on ignition, strength activity index, chemical composition, mineral composition and microtopography. The difference of performance between denitration fly ash and ordinary fly ash are systematically analyzed. The basic performance and mechanical properties of the high nitrogen denitrification fly ash are analyzed by high temperature calcination. The results show that the appearance, water requirement ratio, chemical composition, mineral composition and microtopography of denitration fly ash are similar with ordinary fly ash of the same kind of coal under the normal conditions. While the fineness, strength activity index, loss on ignition, nitrogen and sulphur trioxide reflected a slight change from the ordinary fly ash. It is proposed that the loss on ignition, nitrogen content and sulfur trioxide content of high nitrogen fly ash decreased by 38%, 98% and 53% respectively after high temperature calcination by denitration and reburning technology, and the pressure strength of 28 d increased by 7.7%.

韩云婷,杨利香,纪晶.脱硝工艺对粉煤灰材性影响与安全利用控制技术研究[J].混凝土与水泥制品,2018(7):95-100. HAN Y T,YANG L X,JI J.Study on Effect of Denitration on Performance of Fly Ash and the Technology of Resource Security Utilization[J].China Concrete and Cement Products,2018(7):95-100.

摘  要：选择三个级配区域的铁尾矿砂单独或者组合替代天然砂制备石膏基自流平砂浆，研究其工作性能和力学性能，并与天然砂制备的石膏基自流平砂浆的工作性能和力学性能进行对比，分析铁尾矿砂颗粒形貌及颗粒级配对石膏基自流平砂浆的影响机理。结果表明，用0.3～0.5mm、0.1～0.3mm、0～0.1mm三个颗粒级配区域铁尾矿砂组合全部替代天然砂制备的石膏基自流平砂浆虽然会提高15%用水量，但其工作性能和力学性仍能满足JC/T1023—2007《石膏基自流平砂浆》对工作性能和力学性能的要求。铁尾矿砂和天然砂的颗粒形貌差异较大导致了石膏基自流平砂浆流动性降低，调整铁尾矿砂及整个石膏基自流平砂浆颗粒级配组合可以提高石膏基自流平砂浆的强度。Abstract:Threegradationsofironoretailingsareselectedtopreparegypsum-basedself-levelingmortarforreplacingnaturalsandaloneorincombination.Theworkingperformanceandmechanicalperformanceofthegypsum-basedself-levelingmortararestudied.Themechanismsofparticleshapeandparticlegradationofironoretailingsongypsum-basedself-levelingmortarareanalyzed.Theresultsshowthatthewaterrequirementsofgypsum-basedself-levelingmortarpreparedby0.3～0.5mm,0.1～0.3mmand0～0.1mmironoretailingsincombinationinsteadofallnaturalsandis15%higherthanpreparedbynaturalsand.Theworkingperformanceandmechanicalperformanceofthesurfacemortarforgypsum-basedself-levelingmortarpreparedby0.3～0.5mm,0.1～0.3mmand0～0.1mmironoretailingsincombinationinsteadofallnaturalsandcanmeetrequirementsofstandardJC/T1023—2007Gypsumhasedself-levelingfloorcompound.Thedifferenceofparticleshapebetweenironoretailingssandandnaturalsandleadstothedecreaseoffluidityofgypsum-basedself-levelingmortarpreparedbyironoretailings.Theflexuralstrengthandcompressivestrengthofgypsum-basedself-levelingmortarcanbeimprovedbyadjustingtheparticlegradationofironoretailingssandandgypsum-basedself-levelingmortar.

黄天勇,陈旭峰,章银祥,等.分级铁尾矿砂对石膏基自流平砂浆性能的影响[J].混凝土与水泥制品,2018(7):91-94+100. HUANG T Y,CHEN X F,ZHANG Y X,et al.The Influence of Graded Iron Ore Tailing on Properties of Gypsum-based Self-leveling Mortar[J].China Concrete and Cement Products,2018(7):91-94+100.

摘 要：为研究废弃混凝土与废弃砖再生骨料作为轻交通量公路基层材料时水泥稳定建筑垃圾再生骨料混合料的路用性能，进行了不同龄期的无侧限抗压强度试验、劈裂抗拉试验和抗压回弹模量试验，分析了不同骨料配合比、不同水泥用量对水泥稳定建筑垃圾再生骨料混合料的基本力学性能的影响。结果表明，不同龄期的无侧限抗压强度、劈裂抗拉强度以及抗压回弹模量受骨料种类和掺入量的影响较大，掺入混凝土再生骨料含量越多，其混合料强度就较高；含砖量越大，强度越低，但仍能满足现行规范中对基层路用性能的要求。同一种类骨料，水泥用量越高，7 d无侧限抗压强度、劈裂抗拉强度以及抗压回弹模量也越大。水泥用量的增加可提高混合料的无侧限抗压强度，但高含量的废弃砖会降低其强度。 Abstract: In order to study the road performance of cement stabilized construction waste recycled aggregate mixture when waste concrete and waste brick recycled aggregate are used as light traffic highway base material, unconfined compressive strength tests, splitting tensile tests and compressive resilience modulus tests are carried out. The effects of different aggregate mix proportion and different cement contents on the basic mechanical properties of cement stabilized construction waste recycled aggregates are analyzed. The results show that the unconfined compressive strength, splitting tensile strength and compressive resilience modulus at different ages are greatly affected by the type and amount of aggregate. The more the content of recycled aggregate, the higher strength of the mixture; the larger the brick content, the lower the strength, but which still meets the current specifications of the road performance requirements. The same type of aggregate, the higher the cement content, the greater 7 d unconfined compressive strength, splitting tensile strength and compressive rebound modulus. The increase of cement content can increase the unconfined compressive strength of the mixture, but the high content of waste brick can reduce its strength.

文华,杨涛,刘颖,等.再生骨料作为轻交通量公路基层材料路用性能研究[J].混凝土与水泥制品,2018(7):87-90. WEN H,YANG T,LIU Y,et al.Research on Road Performance of Recycled Aggregate as Light Traffic Highway Base Materials[J].China Concrete and Cement Products,2018(7):87-90.

摘 要：通过对大温差恶劣环境下混凝土桥墩早期水化热温度场进行分析，得到外界环境对混凝土结构早期水化热温度场的影响。试验结果表明，大温差环境下混凝土桥墩早期若无养护会产生较大的温度应力，易导致温度裂缝。养护剂养护、土工布养护、橡塑板养护和SAP复合材料养护对这种病害的防护均有不同程度的改善，其中，SAP复合材料养护效果最佳，良好的保温保湿效果使混凝土桥墩内部温度场分布更为均匀，具有良好的养护防裂效果。 Abstract: Through the analysis of the early hydration heat temperature field of concrete bridge piers under the bad environment of large temperature difference, the influence of external environment on the early hydration heat temperature field of concrete structure is obtained. The test results show that if there is no curing in the early stage of concrete pier in large temperature difference environment, it will produce large temperature stress and easily lead to temperature cracks. Curing agent curing, geotextile curing, rubber plastic plate curing and SAP composite curing can improved the protection of this kind of disease to some extent. Among them, the curing effect of SAP composite is the best. The good heat preservation and moisturizing effect makes the distribution of the temperature field of the concrete bridge pier more uniform, and has good curing and anti cracking effect.

刘德慧.大温差环境下不同养护方式对混凝土桥墩早期开裂的影响[J].混凝土与水泥制品,2018(7):83-86. LIU D H.The Effects of Different Curing Methods on Early Cracking of Concrete Piers under Large Temperature Difference[J].China Concrete and Cement Products,2018(7):83-86.

摘 要：以某气体绝缘金属封闭开关设备（Gas Insulated Switchgear，GIS）超长大体积混凝土基础混凝土抗裂为例，根据工程特点进行了跳仓法的可行性分析，制定了跳仓法的施工方案，采用MIDAS有限元软件对其施工步骤进行仿真分析。仿真计算结果表明，所有跳仓混凝土施工过程中，其最大拉应力均没有超过容许抗拉强度，从而验证了跳仓法施工技术在该工程混凝土裂缝控制方面的可行性。 Abstract: Taking the construction and cracking control of a GIS which has super long mass concrete foundation as an example and according to the characteristics of the project, the feasibility analysis of the alternative bay method construction is made, and the plan of construction is worked out. Then the MIDAS finite element software is applied to simulate the construction steps. The results show that the maximum tensile stress in concrete is no more than the allowable tensile stress, which verifies the feasibility of the alternative bay method construction in the control of concrete cracks in this project.

胡东康,赵海涛,何赠辉.跳仓法在超长大体积混凝土抗裂中的应用研究[J].混凝土与水泥制品,2018(7):79-82. HU D K,ZHAO H T,HE Z H.Application Research on Cracking Control of Super Long Mass Concrete Using Alternative Bay Method[J].China Concrete and Cement Products,2018(7):79-82.

摘 要：水泥基材料加水搅拌后，随着水化反应的进行，其状态从可塑性流体逐渐转变为具有一定强度的硬化固体，此过程可采用超声波透射法进行连续、无损监测。通过分析获得的超声波信号如波速、振幅等，可解读出反映水泥基材料的水化进程信息。本文从试验装置、测试原理、主要影响因素及凝结时间判断方法等四个方面介绍了超声波透射法在测定水泥基材料凝结时间上的研究进展，讨论了浆体含气量对超声波波速的影响，并分析了现有凝结时间判断方法的优缺点。 Abstract: After the cement-based material is stirred with water, the state of the cement-based material gradually changes from the plastic fluid to a hardened solid with a certain intensity as the hydration reaction progresses. The process can be continuously and non-destructively monitored by the ultrasonic transmission method. By analyzing the obtained ultrasonic signals such as wave velocity, amplitude, etc., the hydration process information reflecting the cement-based material can be interpreted. The research progress of the ultrasonic transmission method in determining the setting time of cement-based materials is introduced in detail from the aspects of the testing device, testing principle, main influencing factors and judging methods. The influence of the air content of slurry on the ultrasonic wave velocity is emphatically discussed, and the advantages and disadvantages of the existing methods for determining the setting time are analyzed.

杨辉,俞海勇,李辉.超声波透射法测试水泥基材料凝结时间研究综述[J].混凝土与水泥制品,2018(7):75-78. YANG H,YU H Y,LI H.Study Review on Setting Time of Cement-based Materials Tested by Ultrasonic Wave Transmission Method[J].China Concrete and Cement Products,2018(7):75-78.