Monitoring, Modeling, and Diagnosis of Alkali-Silica Reaction in Small Concrete Samples

Agarwal, Vivek¹  Cai, Guowei¹  Gribok, Andrei V.¹  Mahadevan, Sankaran¹ 

[1] Idaho National Lab. (INL), Idaho Falls, ID (United States)

关键词: CONCRETES;    SODIUM HYDROXIDES;    SODIUM IONS;    SILICA;    NUCLEAR POWER PLANTS;    SOLUTIONS;    COMPUTERIZED SIMULATION;    CHEMICAL REACTION KINETICS;    GLASS;    HARDNESS;    WATER;    ANISOTROPY;    EXPANSION;    DECOMPOSITION;    RANDOMNESS;    STRESSES;    TEMPERATURE RANGE 0273-0400 K;    TIME DEPENDENCE Alkali Silica Reaction;    Concrete Sample with Embedded Glass;    Concrete Structural Health Monitoring;    MOOSE Modeling;    Percolation Theory;   

DOI  :  10.2172/1245691
RP-ID  :  INL/EXT--15-36683
PID  :  OSTI ID: 1245691
Others  :  TRN: US1601245

美国|英语

来源: SciTech Connect

【 摘 要 】

Assessment and management of aging concrete structures in nuclear power plants require a more systematic approach than simple reliance on existing code margins of safety. Structural health monitoring of concrete structures aims to understand the current health condition of a structure based on heterogeneous measurements to produce high-confidence actionable information regarding structural integrity that supports operational and maintenance decisions. This report describes alkali-silica reaction (ASR) degradation mechanisms and factors influencing the ASR. A fully coupled thermo-hydro-mechanical-chemical model developed by Saouma and Perotti by taking into consideration the effects of stress on the reaction kinetics and anisotropic volumetric expansion is presented in this report. This model is implemented in the GRIZZLY code based on the Multiphysics Object Oriented Simulation Environment. The implemented model in the GRIZZLY code is randomly used to initiate ASR in a 2D and 3D lattice to study the percolation aspects of concrete. The percolation aspects help determine the transport properties of the material and therefore the durability and service life of concrete. This report summarizes the effort to develop small-size concrete samples with embedded glass to mimic ASR. The concrete samples were treated in water and sodium hydroxide solution at elevated temperature to study how ingress of sodium ions and hydroxide ions at elevated temperature impacts concrete samples embedded with glass. Thermal camera was used to monitor the changes in the concrete sample and results are summarized.