RIA: In-Place Determination of Early-Age Concrete Strength in Slabs and Walls Using the Impact-Echo Method

有关混凝土早期强度的可靠信息可以用来提高混凝土施工的安全性和经济性。例如，可以使用可靠的现场混凝土强度测量来确定何时获得了足够的强度，以允许拆除支撑、转移预应力、应用后张法和终止养护。现场强度信息使每一项作业都能在尽可能早的时间安全进行，从而实现更经济的施工。拟议研究的目标是继续开发一种新的测试方法，即冲击回波法，用于现场测量早期混凝土强度。在本研究中，将建立纵波速度与混凝土强度之间的冲击回波方法。这种相关关系将用圆柱形混凝土试件建立，适用于板状混凝土结构构件，如楼板和墙体。这项工作代表着使用冲击回波法测量混凝土就地强度的标准化测试的发展进步。

Reliable information about the in-place early-age strength of concrete can be used to improve the safety and economy of concrete construction. For example, reliable measurements of in-place concrete strength can be used to determine when adequate strength has been obtained to allow removal of shoring, transfer of prestressing, application of post-tensioning, and termination of curing. In-place strength information allows each of these operations to proceed safely and at the earliest possible time, leading to more economical construction. The objective of the proposed research is to continue development of a new test method, the impact-echo method, for measuring in-place early age concrete strength. In this study, the impact-echo method will be established between P-wave velocity and concrete strength. This correlation relationship will be established using cylindrical concrete specimens is applicable to plate-like concrete structural elements such as slabs and walls. This work represents an advancement towards the development of a standardized test for measuring the in-place strength of concrete using the impact-echo method.