Candelaria Ma Doreen Esplana, Kee Seong-Hoon, Yee Jurng-Jae, Lee Jin-Wook
Department of ICT integrated Ocean Smart Cities Engineering, Dong-A University, Busan 49315, Korea.
Institute of Civil Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines.
Materials (Basel). 2020 Dec 31;14(1):152. doi: 10.3390/ma14010152.
The main objective of this research is to investigate the effect of water content in concrete on the velocities of ultrasonic waves (P- and S-waves) and mechanical properties (elastic modulus and compressive strength) of concrete. For this study, concrete specimens (100 mm × 200 mm cylinders) were fabricated with three different water-to-binder ratios (0.52, 0.35, and 0.26). These cylinders were then submerged in water to be saturated in different degrees from 25% to 100% with an interval of 25% saturation. Another set of cylinders was also oven-dried to represent the dry condition. The dynamic properties of concrete were then assessed using a measurement of elastic wave accordance with ASTM C597-16 and using resonance tests following ASTM C215-19, before and after immersion in water. The static properties of saturated concrete were also assessed by the uniaxial compressive testing according to ASTM C39/C39M-20 and ASTM C469/C469M-14. It was observed that the saturation level of concrete affected the two ultrasonic wave velocities and the two static mechanical properties of concrete in various ways. The relationship between P-wave velocity and compressive strength of concrete was highly sensitive to saturation condition of concrete. In contrast, S-wave velocity of concrete was closely correlated with compressive strength of concrete, which was much less sensitive to water saturation level compared to P-wave velocity of concrete. Finally, it was noticed that water saturation condition only little affects the relationship between the dynamic and elastic moduli of elasticity of concrete studies in this study.
本研究的主要目的是探究混凝土中的含水量对超声波（纵波和横波）速度以及混凝土力学性能（弹性模量和抗压强度）的影响。在本研究中，制作了三种不同水胶比（0.52、0.35和0.26）的混凝土试件（100毫米×200毫米圆柱体）。然后将这些圆柱体浸入水中，使其饱和度在25%至100%之间以25%的饱和度间隔达到不同程度的饱和状态。还制作了另一组圆柱体并进行烘干以代表干燥状态。在混凝土浸入水之前和之后，根据ASTM C597 - 16通过弹性波测量以及按照ASTM C215 - 19进行共振试验来评估混凝土的动态性能。饱和混凝土的静态性能也通过根据ASTM C39/C39M - 20和ASTM C469/C469M - 14进行的单轴压缩试验来评估。观察到混凝土的饱和度以多种方式影响混凝土的两种超声波速度和两种静态力学性能。混凝土的纵波速度与抗压强度之间的关系对混凝土的饱和状态高度敏感。相比之下，混凝土的横波速度与混凝土的抗压强度密切相关，与混凝土的纵波速度相比，其对水饱和度水平的敏感度要低得多。最后，注意到在本研究中，水饱和状态对混凝土动态弹性模量和静态弹性模量之间的关系影响很小。
