Fundamental Properties and Bond Characteristics of Chlorinated Polyvinyl Chloride (CPVC) and SS340 Adhesive for Evaluation of Steel Tank Linings
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Date
2006-12-28
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Abstract
Tank linings are used to extend the service life of tanks and to avoid replacement of damaged tanks. Adhesive materials play a major role in the effectiveness of the liner. The main objective of this research is to understand the behavior of the different materials proposed for lining typical bleach tanks used in the pulp and paper industry. This research will focus on the behavior of the selected Structural Adhesive Series 340 (SS340) for a proposed lining system and its interaction with Chlorinated Polyvinyl Chloride material (CPVC) as well as the steel material at various temperatures and sustained stress levels. The experimental program was designed to subject the specimens to a combination of corrosive environments and sustained stresses in order to study their behavior and to determine the effect of those conditions on the behavior and service life. Research findings provide better understanding of the adhesive when subjected to severe environmental conditions and sustained loads. The overall composite behavior of the proposed lining for steel tanks based on testing of small-scale models subjected to high temperature is investigated.
The experimental program focuses on the fundamental material properties and bond characteristics of SS340 when subjected to severe conditions. Test variables include temperature and applied sustained loads, as well as time and soaking solution. Sixty-six SS340 specimens and sixty-six CPVC specimens were examined under severe environmental exposure to determine the effects of these conditions on the tensile strength. The bond characteristics were investigated using fifty double lap shear specimens to examine the bond behavior of CPVC-to-steel surfaces. The investigation focused on the influence of the environmental exposure on the shear strength of the adhesive bond. Results obtained from tension and lap shear tests were used to identify the performance associated with each variable. Such influences are critical to the future field applications of these materials in extreme environments. Conclusions are focused on ultimate tensile strength and shear strength under various environmental conditions. Test results also provided limitations of the temperature and sustained load level, which can be used safely under service loading conditions.
The final phase of the experimental program consists of small-scale specimens to simulate the lining proposed for a typical steel bleach tank. The specimens were subjected to extreme temperature changes to examine the thermal gradient distribution and the composite interaction of the CPVC liner to the steel wall under the effect of temperature. Strains and temperatures were recorded at each interface. Finite element analysis was conducted to validate test results. The analytical model was used to study the effect of key parameters believed to affect the behavior including boundary conditions and specimen dimensions.
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Keywords
lining, bond, environmental conditions, adhesives, tank, steel
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Degree
MS
Discipline
Civil Engineering
