摘  要：通过设计不同粗细和级配的机制砂，研究了机制砂细度模数和级配对湿拌砂浆性能的影响。结果表明，当机制砂细度模数在1.2～3.0时，随着机制砂细度模数的增大，湿拌砂浆单方用水量减小，保水性下降，和易性和抗压强度呈先提高后降低，干缩率呈先减小后增大的变化规律。当机制砂公称粒径在0.315mm以上颗粒的分计筛余相同时，随着机制砂中小于0.315mm颗粒含量的增加，湿拌砂浆力学性能先提高后降低，干缩率先减小后增大。控制机制砂中小于0.315mm细颗粒含量为30%，机制砂中大于1.25mm颗粒含量超过30%时，湿拌砂浆拉伸黏结强度明显降低，干缩率显著增大。Abstract:Throughthedesignofmanufacturedsandwithdifferentfinenessmodulusandgradation,theinfluenceoffinenessmodulusandgradationofmachine-madesandontheperformanceofwet-mixedmortarisstudied.Theresultsshowthatwhenthefinenessmodulusofsandisintherangeof1.2～3.0,withtheincreaseofthemodulusofsand,thewaterconsumptionofwet-mixedmortarisreduced,thewaterretentionisdecreased,theworkabilityandcompressionstrengthincreasesfirstandthendecreases,andtheshrinkageratedecreasesandthenincreases.Whengraderretainedpercentageofsandgreaterthan0.315mmisthesame,themechanicalpropertiesofthewet-mixedmortarareimprovedandthendecreases,andtheshrinkageratedecreasesfirstandthenincreaseswiththeincreaseofthecontentofparticleslessthan0.315mminthesand.Controlmachine-madesandlessthan0.315mmparticlecontentof30%,whenthecontentofgreaterthan1.25mmparticlesismorethan30%,thetensilebondstrengthofwet-mixedmortarisobviouslyreducedandtheshrinkagerateissignificantlyincreased.

邢光延,叶建雄,白光,等.机制砂对湿拌砂浆性能的影响研究[J].混凝土与水泥制品,2017(10):89-93. XING G Y, YE J X, BAI G,et al.Effects Study of Manufactured Sand on Performance of Wet-mixed Mortar[J].China Concrete and Cement Products,2017(10):89-93.

摘 要：设计了4批不同尺寸的秸秆纤维，将其均匀地掺入水泥砂浆中。通过劈裂拉伸试验，研究了秸秆纤维对混凝土拉伸强度和劈裂韧性的影响。结果表明，混凝土中掺入秸秆纤维可控制基体混凝土裂纹的发展，从而提高劈裂韧性。此种混凝土适合应用于对承载力要求不大，但对韧性要求较高的建筑主体中，可实现就近取材，减少环境污染等目的。 Abstract: The four groups with different size of straw fiber are designed to mix evenly into the cement mortar. The effect of straw fiber on the recovery rate and cleavage toughness of concrete after cracking are studied by splitting experiments. The results show that the addition of fiber material in concrete can control the further development of concrete cracks in the matrix, so as to improve the crack resistance. This kind of concrete is suitable for building materials where the bearing capacity is not highly required but requiring high toughness, while achieving to use the nearest material and reduce environmental pollution.

陈斌,卢玉斌,苏实,等.秸秆纤维对混凝土拉伸性能的影响[J].混凝土与水泥制品,2017(10):85-88. CHEN B, LU Y B, SU S,et al.Influence of Straw Fiber on Tensile Properties of Concrete[J].China Concrete and Cement Products,2017(10):85-88.

摘 要：针对钻孔咬合桩的施工工艺特点，采用自行研制的专用缓凝高效减水剂以及Ⅱ级粉煤灰和 S75 矿渣粉双掺技术，配制出了具有良好的工作性能的水下超缓凝混凝土，混凝土缓凝时间达60h以上，3d强度不低于3MPa 、28d强度不低于设计强度等级。 Abstract: According to the construction characteristics of the bored lock piles, a new super retarding concrete is prepared by the set-retarding and super plasticizer, and mixed with Ⅱ fly ash and granulated blast furnace slag. The underwater super retarding concrete has good flow properties, the setting time can reach 60 hours when this product is contained in the concrete, the 3 days strength is not under 3MPa, and the 28 days strength can meet the design requirement.

曹良桂,何锐波,王世强,等.水下超缓凝混凝土在钻孔咬合桩中的应用[J].混凝土与水泥制品,2017(10):82-84. CAO L G, HE R B, WANG S Q,et al.Application of Underwater Super-retarding Concrete in Bored Lock Piles[J].China Concrete and Cement Products,2017(10):82-84.

摘 要：结合哈尔滨市阳明滩自锚式悬索桥自锚梁（过渡孔混凝土梁）C50级混凝土冬期施工所采取的综合蓄热法选择与实施过程，分析了在严寒地区初冬时节C50级混凝土配合比设计思路、冬期施工混凝土防冻害综合蓄热养护方法以及亚高强级大体积混凝土冬期施工过程中的温度控制与监测过程，提出了极端环境下重大工程混凝土冬期施工的技术条件，可供类似工程冬期施工参考。 Abstract：In this paper, a combination of the application of comprehensive thermal storage method and the winter construction implementation process in Grade C50 self-anchored suspension bridge of Harbin Yangming Beach Bridge is presented, the concrete mix design method of grade C50 concrete in severe cold area in early winter, the anti-frost damage comprehensive thermal storage method winter construction technology and the temperature control and monitoring process of sub-strength mass concrete in winter construction process are analyzed, the technology requirements of the winter construction of key project under an extreme environment were proposed, which provides reference for similar winter construction projects.

江守恒,董淑慧,朱卫中.C50级自锚梁混凝土综合蓄热法冬期施工技术[J].混凝土与水泥制品,2017(10):77-81. JIANG S H, DONG S H ,ZHU W Z.Construction Technology for Comprehensive Thermal Storage of C50 Self-anchored Concrete in Winter[J].China Concrete and Cement Products,2017(10):77-81.

摘 要：自制模拟现场钢管混凝土缺陷模型，采用超声波对测法测试不同脱黏状态钢管混凝土模型的密实度，对比分析了超声波参数变化与钢管混凝土缺陷之间的关系，找出了能够准确判断钢管混凝土缺陷的方法与规律。结果表明，依据超声波首波相位、声时值和波幅的变化，可以判断钢管混凝土脱黏区域、空洞和断层等缺陷。 Abstract: The model which of concrete filled steel tube defect is made, and the different debonding models are tested by non-metal ultrasonic. By analyzing the relationship between the defect and ultrasonic parameters, the method and regularity of judging concrete filled steel tube defect are found. The results show that on the basis of the change of the ultrasonic first phase, duration and amplitude, the concrete filled steel tube defect such as fault and debonding area and empty can be determined.

金瑞灵,南峰,伍勇华,等.超声波测试矩形钢管混凝土密实度的试验研究[J].混凝土与水泥制品,2017(10):73-76. JIN R L, NAN F, WU Y H,et al.Experimental Research on Compactness of Concrete-filled Rectangular Tubular Tested by Non-metal Ultrasonic[J].China Concrete and Cement Products,2017(10):73-76.

摘 要：现提倡绿色材料，节能环保新型建材，采用粉煤灰、陶粒等材料配制的陶粒混凝土，可以降低结构自重，提高抗震性能。本文进行了正交试验研究，得出对陶粒混凝土抗压强度影响程度的因素由大到小分别为水灰比、砂率、粉煤灰掺量，并进而得出最优配合比；对陶粒混凝土受压破坏形态进行了分析，结果表明，水泥砂浆与陶粒的界面破坏和陶粒全截面断裂破坏是陶粒混凝土受压破坏的主要形态。 Abstract: Energy saving and environment protection in buildings and building materials are advocated nowadays. Using fly ash, ceramsite and other materials to prepare the ceramsite concrete can reduce weight and improve seismic performance.The compressive strength of ceramisite concrete is studied by orthogonal test, the conclusion shows that the order of factors of compressive strength is: water-cement ratio, sand rate and the mixing amount of fly ash, and then the optimal ratio is obtained. The failure mode of the ceramsite concrete is analyzed, and there are two kinds of failure modes, the interface failure of the cement mortar and the whole cross section rupture of the ceramsite.

王昭恩,冯绍颖,林荣斌,等.陶粒混凝土配制及强度试验研究[J].混凝土与水泥制品,2017(10):70-72. WANG Z E, FENG S Y, LIN R B,et al.Study on Preparation and Strength Testing of Ceramisite Concrete[J].China Concrete and Cement Products,2017(10):70-72.