Guidelines concerning alkali silica reaction
During the past ten years the Netherlands has made considerable progress controlling alkali silica reaction (ASR) related risks for structures.
A national guideline on the prevention of ASR (CUR recommendation 89) has been in use for a few years, taking control of risk of ASR on the one hand, while leaving industry sufficient freedom to make an optimal concrete mix on the other.
Existing structures that suffer ASR damage, can be assessed for structural consequences using the new guideline for the inspection and structural evaluation of ASR (CUR-recommendation 102), based on risk assessment and new calculation methods.
The effectiveness of maintenance measures has been evaluated based on a fully automated monitoring system applied to sixteen bridges. Recently a controlled load test method has been developed to determine the structural reliability for ASR affected bridges.
Both CUR-recommendations mentioned in this article can be downloaded in English for free.