摘   要：采用硅烷偶联剂KH560对纳米SiO2进行接枝改性，通过傅里叶红外变换光谱、热重分析及微观形貌分析等方法研究了KH560对纳米SiO2改性机理的影响，探究了改性SiO2-苯丙乳液复合涂层中掺入一定质量分数的改性纳米SiO2对混凝土抗硫酸盐溶液冻融性能的影响，并分析了改性纳米SiO2对苯丙乳液涂层的增强机理。结果表明：采用KH560改性后，纳米SiO2颗粒的团聚状态得到了显著改善，热稳定性提高；当改性纳米SiO2的质量分数为4%时，C4复合涂层对混凝土的防护作用最好，此时混凝土抗硫酸盐溶液冻融等级由F100~F150提升到F300以上；300次硫酸盐溶液冻融循环后，混凝土的质量损失率仅为0.35%，相对动弹性模量为96.2%，此时混凝土内部结构并未发生明显破坏。 Abstract: Modification of nano-SiO2 with KH560 silane coupling agent was studied by Fourier transform infrared spectroscopy, thermogravimetric analysis, and microscopic morphology analysis. The modification mechanism of nano-SiO2 with KH560 was explored. The influence of adding a certain mass fraction of modified nano-SiO2 on the freeze-thaw resistance of concrete against sulfate solution was investigated, and the strengthening mechanism of modified nano-SiO2 on styrene acrylic lotion coating was analyzed. The results show that after modification with KH560, the agglomeration state of nano-SiO2 particles is significantly improved, and the thermal stability is enhanced. When the mass fraction of modified nano-SiO2 is 4%, the C4 composite coating has the best protective effect on concrete, and the freeze-thaw resistance of concrete to sulfate solution is increased from F100~F150 to F300 or above. After 300 freeze-thaw cycles of sulfate solution, the mass loss rate of concrete is only 0.35%, and the relative dynamic modulus of elasticity is 96.2%. At this time, there is no significant damage to the internal structure of the concrete.

余茂林,邓安仲,沈海玉,等.改性纳米SiO2-苯丙乳液混凝土复合防护涂层的制备及性能研究[J].混凝土与水泥制品,2024(11):1-6 YU M L,DENG A Z,SHEN H Y,et al.Preparation and properties of modified nano-SiO2-styrene acrylic lotion composite protective coating for concrete[J].China Concrete and Cement Products,2024(11):1-6.

摘   要：为分析粗糙度对硫氧化细菌生物被膜特征的影响，通过超景深显微镜、扫描电子显微镜、能谱仪、紫外分光光度计等表征方法，研究了污水环境中的硫氧化细菌在不同粗糙度砂浆试件表面形成生物被膜的宏观形貌、微观形貌、微生物数量、蛋白质含量及生物被膜厚度。结果表明：随着龄期的增加，试件粗糙度对硫氧化细菌生物被膜的宏观形貌、微观形貌及结构、生长脱落总周期影响不大，但会影响生物被膜的形成分布，粗糙度较大会延长生物被膜的黏附时间，并导致部分生物被膜提前脱落。 Abstract:  In order to analyze the influence of roughness on the biofilm characteristics of sulfur-oxidizied bacteria, the macroscopic and microscopic morphology, microbial quantity, protein content, and biofilm thickness of sulfur-oxidizied bacteria formed on the surface of mortar specimens with different roughness in sewage environment were studied using testing methods such as ultra depth of field microscope, scanning electron microscope, energy spectrometer, and ultraviolet spectrophotometer. The results show that as the age increases, the roughness has little effect on the macroscopic morphology, microscopic morphology and structure, as well as the total growth and shedding cycle of sulfur-oxidized bacterial biofilms. However, it can affect the formation and distribution of biofilms. Higher roughness prolongs the adhesion time of biofilms and leads to premature shedding of some biofilms.

陈晓庆,荣辉,刘鑫,等.砂浆粗糙度对污水硫氧化细菌生物被膜特征的影响研究[J].混凝土与水泥制品,2024(11):7-11,16. CHEN X Q,RONG H,LIU X,et al.The influence of mortar roughness on the biofilm characteristics of sewage sulfur-oxidized bacteria[J].China Concrete and Cement Products,2024(11):7-11,16.

周暘,黄冬梅,丰桢敏,等.纳米SiO2气凝胶水泥基复合材料中水的形态分布规律研究[J].混凝土与水泥制品,2024(11):12-16. ZHOU Y,HUANG D M,FENG Z M,et al.Study on moisture morphology distribution of nano-SiO2 aerogel cement based composites[J].China Concrete and Cement Products,2024(11):12-16.

摘   要：以常泰长江大桥工程为背景，采用一种基于流变仪摩擦计测试流变性能的试验方法，研究了水胶比、同胶凝材料总量、砂率对超高桥塔混凝土工作性及泵送性能的影响，并分析了泵管管径、泵送排量对泵送性能的影响。结果表明：适当提高水胶比、增加胶凝材料总用量、增加砂率均对改善混凝土的工作性与泵送性能有利；流变改性材料的掺入可大幅降低润滑层的黏度系数与混凝土的泵送阻力。 Abstract: Taking the Changtai Yangtze River Bridge project as the background, a test method based on rheometer friction meter was adopted to test rheological properties to study the effects of water-binder ratio, total amount of the same cementitious material, and sand ratio on the workability and pumpability of concrete for ultra high bridge towers. The influence of pump pipe diameter and pumping displacement on pumpability was also analyzed. The results indicate that appropriately increasing the water-binder ratio, total amount of cementitious materials, and sand ratio are all beneficial for improving the workability and pumpability of concrete. The addition of rheological modified materials can significantly reduce the viscosity coefficient of the lubricating layer and the pumping resistance of concrete. 

黄涛,潘利,毛永琳,等.超高桥塔混凝土泵送性能优化试验研究[J].混凝土与水泥制品,2024(11):17-21. HUANG T,PAN L,MAO Y L,et la.Experimental research on pumpability optimization for ultra high bridge tower concrete[J].China Concrete and Cement Products,2024(11):17-21.

摘   要：利用分形理论结合图像处理方法对骨料的级配和粒形特征进行了定量评价，研究了不同分形维数下骨料特征对水下不分散混凝工作性、抗分散性能、力学性能、气泡特征、抗冻性能的影响。结果表明：随着级配分形维数的增加，水下不分散混凝土的工作性和抗压强度先提高后降低，抗分散性能提高，但抗冻性能降低，气泡间距系数与抗冻性能间存在良好的对应关系；当级配分形维数为2.5时，综合性能相对最佳；随着粒形分形维数的增加，水下不分散混凝土的工作性略有提高，但对抗分散性能、抗压强度、抗冻性能的提高效果不显著。 Abstract: A quantitative evaluation was conducted on the gradation and shape characteristics of aggregates using fractal theory combined with image processing methods. The effects of aggregate characteristics under different fractal dimensions on the workability, anti dispersion performance, mechanical performance, bubble characteristics, and frost resistance of underwater non-dispersed concrete were studied. The results show that as the fractal dimension of the gradation increases, the workability and compressive strength of underwater non-dispersed concrete first increase and then decrease, and the anti dispersion performance improves, but the frost resistance decreases. There is a good correspondence between the bubble spacing coefficient and the frost resistance. When the fractal dimension of the gradation is 2.5, the comprehensive performance is relatively optimal. As the fractal dimension of particle shape increases, the workability of underwater non-dispersed concrete slightly improves, but the improvement effect on anti dispersion performance, compressive strength, and frost resistance is not significant.

曾涛,胡洪涛,黄仁阔,等.骨料特征对水下不分散混凝土性能的影响[J].混凝土与水泥制品,2024(11):22-27. ZENG T,HU H T,HUANG R K,et al.Effect of aggregate characteristics on the performance of underwater non-dispersible concrete[J].China Concrete and Cement Products,2024(11):22-27.

摘   要：为提供透水混凝土的路面强度和耐久性能，研究了外加剂和掺合料对透水混凝土强度和耐久性能的影响，采用CT扫描技术，分析了不同材料对透水混凝土孔隙特征的影响，并总结孔隙特征与强度、抗剥落性能的关系。结果表明：不同材料会影响透水混凝土的孔隙特征，提高透水混凝土的强度，但均未见显著的相关性；不同材料的掺入可以提高透水混凝土的抗剥落性能，但提高的幅度不同，孔隙率对抗剥落性能有一定的影响，而孔隙数量和等效孔径基本无影响。 Abstract: To provide the strength and durability of pervious concrete pavement, the influence of additives and admixtures on the strength and durability of pervious concrete was studied. CT scanning technology was used to analyze the influence of different materials on the pore characteristics of pervious concrete, and the relationship between pore characteristics, strength, and anti-stripping performance was summarized. The results show that different materials can affect the pore characteristics of pervious concrete and improve its strength, but no significant correlation is observed. The addition of different materials can improve the anti-stripping performance of pervious concrete, but the degree of improvement varies. Porosity has a certain impact on the anti-stripping performance, while the number of pores and equivalent pore size have little effect.

张毅,封仁博,侯芸,等.外加剂及掺合料对透水混凝土强度与抗剥落性能的影响[J].混凝土与水泥制品,2024(11):28-35. ZHANG Y,FENG R B,HOU Y,et al.Influence of admixtures and additives on the strength and anti-stripping performance of pervious concrete[J].China Concrete and Cement Products,2024(11):28-35.