In this study, it evaluated the effects of sand/aggregate (S/A) ratio on the flowability, strength, durability, and microstructures of self-compacting concrete (SCC). Testing was performed on specimens using five S/A ratios: 51%, 52%, 53%, 54%, and 55%. Slump flow tests, slump tests, and box tests were used to characterize the rheological properties of the concrete as well as the mechanical properties, including compressive strength, splitting strength, slant shear strength and ultrasonic pulse velocity. Durability was evaluated using tests of absorption, resistivity and initial surface absorption. Microstructures were examined using mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM). The test results indicate that a higher S/A ratio improved flowability. A greater proportion of coarse aggregate (i.e., a decrease in S/A ratio) improved the mechanical properties by 10% compared to the control specimens (S/A ratio: 52%) at 56 days. A higher S/A ratio was shown to improve bonding capacity by enhancing the roughness of the particles and thereby increasing adhesion strength. A higher S/A ratio was also shown to improve the durability of the specimens by permitting denser packing; however, a higher S/A ratio resulted in a thinner interfacial transition zone. MIP analysis did not reveal a correlation between S/A ratio and the interfacial transition zone, whereas SEM photos indicated that a lower S/A ratio reduces the size of the interfacial transition zone.

在这项研究中，它评估了砂/骨料（S / A）比对自密实混凝土（SCC）的流动性，强度，耐久性和微观结构的影响。使用五个S / A比率对样本进行测试：51％，52％，53％，54％和55％。坍落度流动试验，坍落度试验和箱形试验用于表征混凝土的流变性能以及机械性能，包括抗压强度，劈裂强度，倾斜剪切强度和超声脉冲速度。使用吸收，电阻率和初始表面吸收测试来评估耐久性。使用水银压入孔隙率法（MIP）和扫描电子显微镜（SEM）检查微观结构。测试结果表明较高的S / A比可改善流动性。较大比例的粗骨料（即，在56天时，与对照样品（S / A比率：52％）相比，S / A比率的降低）使机械性能提高了10％。显示出较高的S / A比通过提高颗粒的粗糙度从而提高粘合强度而改善了粘合能力。还显示出更高的S / A比可通过允许更密集的堆积来提高样品的耐久性；但是，较高的S / A比会导致界面过渡区变薄。MIP分析未显示出S / A比与界面过渡区之间的相关性，而SEM照片表明较低的S / A比减小了界面过渡区的尺寸。显示出较高的S / A比通过提高颗粒的粗糙度从而提高粘合强度而改善了粘合能力。还显示出更高的S / A比可通过允许更密集的堆积来提高样品的耐久性；但是，较高的S / A比会导致界面过渡区变薄。MIP分析未显示出S / A比与界面过渡区之间的相关性，而SEM照片表明较低的S / A比减小了界面过渡区的尺寸。更高的S / A比显示出通过增强颗粒的粗糙度从而提高粘合强度而改善了粘合能力。还显示出更高的S / A比可通过允许更密集的堆积来提高样品的耐久性；但是，较高的S / A比会导致界面过渡区变薄。MIP分析未显示出S / A比与界面过渡区之间的相关性，而SEM照片表明较低的S / A比减小了界面过渡区的尺寸。