A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Chloride profiling in marine concrete - methods and tools for sampling
This project focuses on how to determine the chloride content in concrete structures exposed to marine environment in an accurate way. When analyzing dust from dry drilling in concrete, it is very often a fact that the chloride profiles show extensive variations even if the sampling has been performed within a very concentrated area with the sampling points close to each other. Several authors have observed this phenomenon in earlier research and some of these are referred to in this thesis. The aim of this project has been to find reasons to these extensive variations and to find inspection methods that decrease the variations. Both laboratory studies and field studies have been performed within the line of this work. The laboratory study has consisted of concrete sampling by dry drilling and by profile grinding 100 mm cores on a concrete slab that had been submerged in saline water in the laboratory. The chloride profiles from the cores have been used as a reference to all other samples collected on the slab. The study shows that profile grinding of cores is the most accurate method to perform sampling on concrete with the purpose of analyzing the chloride content, and that when using small bore diameters the sampling should be performed as mixed samples from several bore holes. In all cases, samples should not only be analyzed for chloride but also for binder content. The results from the dry drilling in laboratory shows that the binder content becomes over estimated in the dust samples compared to the analyzed cores on the same concrete slab. This means that the analyzed dust samples seams to contain a higher chloride content than the cores analyzed by profile grinding. This phenomenon became obvious when simulating chloride profiles using data from EPMA. Most probably the drilling follows an easy path between the large aggregate particles. One field study has been performed in the port of Trelleborg in southern Sweden and another one in the port of Malmö, also in southern Sweden within some 50 km distance ...
Chloride profiling in marine concrete - methods and tools for sampling
This project focuses on how to determine the chloride content in concrete structures exposed to marine environment in an accurate way. When analyzing dust from dry drilling in concrete, it is very often a fact that the chloride profiles show extensive variations even if the sampling has been performed within a very concentrated area with the sampling points close to each other. Several authors have observed this phenomenon in earlier research and some of these are referred to in this thesis. The aim of this project has been to find reasons to these extensive variations and to find inspection methods that decrease the variations. Both laboratory studies and field studies have been performed within the line of this work. The laboratory study has consisted of concrete sampling by dry drilling and by profile grinding 100 mm cores on a concrete slab that had been submerged in saline water in the laboratory. The chloride profiles from the cores have been used as a reference to all other samples collected on the slab. The study shows that profile grinding of cores is the most accurate method to perform sampling on concrete with the purpose of analyzing the chloride content, and that when using small bore diameters the sampling should be performed as mixed samples from several bore holes. In all cases, samples should not only be analyzed for chloride but also for binder content. The results from the dry drilling in laboratory shows that the binder content becomes over estimated in the dust samples compared to the analyzed cores on the same concrete slab. This means that the analyzed dust samples seams to contain a higher chloride content than the cores analyzed by profile grinding. This phenomenon became obvious when simulating chloride profiles using data from EPMA. Most probably the drilling follows an easy path between the large aggregate particles. One field study has been performed in the port of Trelleborg in southern Sweden and another one in the port of Malmö, also in southern Sweden within some 50 km distance ...
Chloride profiling in marine concrete - methods and tools for sampling
Wall, Henrik (author)
2007-01-01
Theses
Electronic Resource
English
Materials Engineering , klorider , betong , provtagning , concrete , sampling , chloride
DDC:
624
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