摘 要：为研究废陶瓷对混凝土力学性能的影响，选取了六种不同状态的废陶瓷以0、45%、50%、55%、60%、65%、70%、75%、100%的取代率等质量替换天然石子，共制作了294个废陶瓷混凝土抗压试件和抗折试件，养护28 d后分别测试其抗压强度和抗折强度。通过对试验数据的分析，研究了不同废陶瓷取代率对混凝土抗压强度和抗折强度的影响，并运用回归分析方法建立了不同废陶瓷取代率下废陶瓷混凝土抗压强度和抗折强度的预测公式。 Abstract: In order to study the effect of waste ceramics on the mechanical properties of concrete, a systematic study was conducted to replace natural stones with mass such as 0, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 100% replacement rate. Six kinds of waste ceramics in different states were selected to make a total of 294 standard compressive and standard flexural specimens of waste ceramic concrete. After curing for 28 days, the standard compressive strength and flexural strength were tested respectively. Based on the analysis of experimental data, the effects of different replacement rates of waste ceramics on the standard compressive strength and flexural strength were studied. The regression analysis method is used to establish the prediction formula of the standard compressive strength and flexural strength of the waste ceramic concrete with different replacement rates.

苏有文,李娇,李雪莹,等.粗骨料取代率对废陶瓷混凝土力学性能的影响[J].混凝土与水泥制品,2019(3):97-100. SU Y W,LI J,LI X Y,et al.Effects of Replace Rate of Coarse Aggregate on Mechanical Properties of Waste Ceramics Concrete[J].China Concrete and Cement Products,2019(3):97-100.

摘 要：为探索建筑垃圾再生微粉用作掺合料的可行性，制备了三种细度的废砖、废混凝土再生微粉，测试其物化性质，并研究不同组成、细度、掺量的再生微粉对水泥胶砂性能的影响。结果表明，组成对水泥胶砂性能影响不大，细度和掺量有较大影响；Ⅱ级再生微粉工作性较好、强度较高；掺量在20%以内对胶砂流动性的降低并不明显，且抗压、抗折强度比分别在85%、75%以上。 Abstract: In order to explore the feasibility of using recycled powder as admixture，waste bricks and waste concrete recycled powder were prepared in three kinds of fineness. The physicochemical properties were tested and the effects of different compositions, fineness and dosage of recycled powder on the performance of cement mortar were studied. The results show that the composition has little effect on the performance of cement mortar, and the fineness and dosage has great influence. The grade II recycled powder has better working performance and higher strength; the reduction of the fluidity of the mortar within 20% is not obvious, and the compressive and flexural strength ratios are above 85% and 75% respectively.

周文娟,季志远,赵磊,等.建筑垃圾再生微粉基本材性及对水泥胶砂性能的影响[J].混凝土与水泥制品,2019(3):93-96. ZHOU W J,JI Z Y,ZHAO L,et al.Basic Performance of Construction Waste Recycled Powder and Its Influence on Properties of Cement Mortar[J].China Concrete and Cement Products,2019(3):93-96.

摘 要：通过昆明南站钻孔灌注桩的工程应用实例，介绍了厚砂层地基中灌注桩基施工的工程特点，并对3种施工方案进行比选，最终确定选用优化后的“浅护筒加泥浆护壁”工艺，该方法保证了桩基施工的安全、质量、进度。同时，对泥浆制备与循环、钢筋骨架制作与安装、混凝土灌注等施工关键技术的控制进行了论述，解决了下穿厚砂层地基中钻孔灌注桩施工的难题。 Abstract: Through engineering application examples of bored cast-in-place piles in Kunming south railway station, the engineering features of the construction of cast-in-place pile foundation in thick sand layer foundation are introduced, and the comparison of three construction schemes is carried out. Finally, the optimized shallow casing with mud protection drilled bores technology is selected, which guarantees safety, quality and progress. At the same time, slurry preparation and circulation, construction and installation of reinforcement cages, concrete infusion and other construction methods are discussed, the difficulties in construction of bored cast-in-place piles under the thick sand layer foundation are solved.

黄玮,张健,文华,等.下穿厚砂层的混凝土钻孔灌注桩施工关键技术研究[J].混凝土与水泥制品,2019(3):89-92. HUANG W,ZHANG J,WEN H,et al.Research on Key Technology of Bored Cast-in-place Pile Construction under Thick Sand Layer[J].China Concrete and Cement Products,2019(3):89-92.

摘 要：南京长江公铁大桥封闭修缮前，在铁路线运营时对混凝土浇筑部位的扰动信息进行了采集与分析，获取了不同方位的振幅与频率。利用振筛试验机模拟浇筑部位的三维扰动，设计并研究了不同扰动制度对混凝土力学性能的影响。结果表明，初凝后1 h起振及持续振动的混凝土试块受扰动后损伤最为严重，抗压强度最大降低幅度为25%左右，抗折强度几乎降为零；初凝前1 h起振的混凝土受扰动之后，试块表面剥落严重，均匀性降低导致强度下降15%左右。 Abstract: Before the closure and repair of Nanjing Chang Jiang Railway Bridge，the vibration information at concrete placement under railway operating is gathered and analyzed ,then amplitude and frequency in different directions are obtained. Tthe influence of different 3D vibration systems on the strength of concrete is studied, based on the shaker tester. Results show that the damage of concrete at 3D vibration systems, start vibrating one hour after initial set and continuous vibrating, are the most serious. The reduction of compressive strength is about 25%, while the flexural strength is almost zero. The reductions of strength of concretes at 3D vibration systems which start vibrating at and before initial set are about 15%，while the surface of the test concretes are seriously peeled off.

李雷,谢德擎,石亮,等.南京长江公铁大桥三维扰动对混凝土力学性能的影响[J].混凝土与水泥制品,2019(3):85-88. LI L,XIE D Q,SHI L,et al.Effects on Mechanical Properties of Concrete of Three-dimensional Disturbance of Nanjing Yangtze River Railway Bridge[J].China Concrete and Cement Products,2019(3):85-88.

摘 要：以桩基检测技术的基本原理为研究基础，综合国内外常用的桩基检测方法及工程应用等发展动态，对桩身完整性、基桩承载力和强度展开讨论，指出了桩基工程质量检测技术的优势及其局限性，提出了桩基检测技术未来的研究方向和发展前景。 Abstract: Taking the basic principle of pile foundation detection technology as the research foundation, comprehensive development of pile foundation detection methods and engineering applications at home and abroad, the pile integrity, pile bearing capacity and strength are discussed, and the quality inspection of pile foundation engineering is pointed out. The advantages of technology and its limitations. The future research directions and development prospects of pile foundation detection technology are briefly described.

程志和,邓友生,孙雅妮,等.桩基检测技术的发展与应用研究[J].混凝土与水泥制品,2019(3):80-84. CHENG Z H,DENG Y S,SUN Y N,et al.Development and Application Study on Pile Foundation Detection Technology[J].China Concrete and Cement Products,2019(3):80-84.

摘 要：为定量研究玻化微珠砂浆在搅拌过程中骨料分布均匀性受搅拌条件的影响，对新拌玻化微珠砂浆中的骨料进行分离，并根据分离得到的骨料与砂浆质量占比，定义了评价新拌砂浆中骨料分布均匀性的均匀度指数。试验结果表明：新拌砂浆中骨料分布均匀性随搅拌时间的延长呈先优化后劣化的变化趋势，搅拌过程中存在最优均匀度；卧式与立式搅拌机均在搅拌至4 min时达到最佳均匀度，卧式搅拌机的新拌砂浆中骨料分布均匀度优于立式搅拌机；玻化微珠骨料参与搅拌的时间相同时，采用先搅拌后投入玻化微珠骨料的方式能够优化骨料分布的均匀性。更高的搅拌机转速能更快提升新拌玻化微珠砂浆均匀度，但是较低的搅拌机转速下拌和的新拌玻化微珠砂浆极限均匀度更优，达到极限的耗时更长。 Abstract: In order to quantitatively study the uniformity of aggregate distribution during the stirring process of glazed hollow bead mortar, the aggregate of the fresh glazed hollow bead mortar was separated. According to the mass ratio of aggregate and mortar obtained by separation, the uniformity index for evaluating the uniformity of aggregate distribution in fresh mortar is defined. The test results show that the uniformity of aggregate distribution in fresh mortar is firstly optimized and then deteriorated with the extension of stirring time, and the optimum uniformity exists during the mixing process. Both horizontal and vertical mixers achieve optimum uniformity when stirred for 4 minutes. The uniformity of aggregate distribution in the new mortar of the horizontal mixer is better than that of the vertical mixer; when the glazed hollow bead aggregates participate in the same stirring time, the uniformity of aggregate distribution can be optimized by first mixing and then feeding into vitrified microbead aggregates. Higher mixer speeds can increase the uniformity of fresh glazed hollow bead mortar faster, but the fresh glazed hollow bead mortar blended at lower mixer speeds has better uniformity and longer time to limit.

涂沛,程忠庆,韩瑞杰.玻化微珠砂浆搅拌过程中骨料分布均匀性研究[J].混凝土与水泥制品,2019(3):75-79. TU P,CHENG Z Q,HAN R J.Research on Aggregate Distribution of Glazed Hollow Bead Mortar during the Mixing Process[J].China Concrete and Cement Products,2019(3):75-79.