Monitoring the hydration of cement using highly nonlinear solitary waves
Monitoring the hydration of cement using highly nonlinear solitary waves
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DOI：
10.1016/j.ndteint.2012.05.003
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发表时间：
2012-11-01
影响因子：
4.2
通讯作者：
Daraio, Chiara
中科院分区：
文献类型：
--
作者：
Ni, Xianglei;Rizzo, Piervincenzo;Daraio, Chiara
在本文中，我们提出了一种基于高度非线性孤立波（HNSW）传播的无损评估技术来监测水泥的水化。 HNSW 是可以在高度非线性系统中形成和传播的机械波，例如接触球形颗粒（即粒状晶体）的一维链。在本研究中，我们使用基于颗粒晶体的致动器/传感器来观察在传感器和新鲜石膏水泥样品之间的机械界面之间传播的孤立波。我们假设沿着基于晶体的传感器传播的反射 HNSW 受到水泥水化过程的影响，并且我们评估了颗粒晶体接触局部区域中样本的弹性模量。为了验证实验结果，我们基于简化的有限元模型进行数值模拟。将颗粒晶体传感器测量的水泥样品的弹性性能与根据 ASTM C109 进行的破坏性试验获得的抗压强度和弹性模量测量值进行比较。我们观察到实验和数值模拟之间具有良好的一致性。 (C) 2012 Elsevier Ltd. 保留所有权利。
In this paper we present a nondestructive evaluation technique based on the propagation of highly nonlinear solitary waves (HNSWs) to monitor the hydration of cement. HNSWs are mechanical waves that can form and travel in highly nonlinear systems, such as one-dimensional chains of contacting spherical particles (i.e., granular crystals). In the present study, we use a granular crystal-based actuator/sensor to observe the solitary waves propagating to and from the mechanical interface between the transducer and a fresh gypsum cement sample. We hypothesize that the reflected HNSWs traveling along the crystal-based transducer are affected by the hydration process of the cement, and we assess the elastic modulus of the specimen in the localized region of the granular crystal contact. To verify the experimental results, we perform numerical simulations based on a simplified finite element model. The elastic properties of the cement specimen measured by the granular crystal transducer are compared with the compressive strength and the elastic modulus measurements obtained from destructive tests, conducted according to the ASTM C109. We observe good agreement between experiments and numerical simulations. (C) 2012 Elsevier Ltd. All rights reserved.