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Development of Accelerated Test Method for Measuring and Minimizing Efflorescence Potential

Ronald L. KozikowskiPeter Clement TaylorF. MacGregor Miller

出版	Portland Cement Association, 2007
URL	http://books.google.com.hk/books?id=MGouOAAACAAJ&hl=&source=gbs_api

註釋Efflorescence is an aesthetic nuisance in the masonry industry that comes in many forms and is due to numerous causes. This research was focused on the development of an accelerated test to assess efflorescence potential for the purpose of studying methods and/or materials to minimize its occurrence. An extensive literature search was conducted prior to the research to gather information on efflorescence mechanisms, reaction components, avoidance, and existing test methods in an effort to aid in the development of the accelerated test. The accelerated test was successfully developed along with a means of quantifying efflorescence potential. Workmanship, admixtures, and supplementary cementitious materials were evaluated according to this method in an effort to find ways of minimizing efflorescence. Workmanship was evaluated by studying the effects of tooling on masonry joints. Admixtures and supplementary materials showing promise in early trials were studied at varying dosage rates to analyze the most effective quantity for minimizing efflorescence. The occurrence of efflorescence could not be totally eliminated utilizing the selected variables, but efflorescence severity was notably decreased by certain variables. An addition of 7.5% cement kiln dust by weight of cement proved to be the most effective means of minimizing efflorescence.