The Study of Drying Shrinkage and Creep on Slag Powder Concrete

• Main Authors: Chen, Shui-chuan, 陳水全
• Other Authors: 劉英偉
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/84665279271859047729

碩士 === 國立屏東科技大學 === 土木工程系碩士班 === 94 === The addition of slag powder into concrete is mostly applied to the replacement of cement in concrete, and the resulted Pozzolan effect, in addition to the strength of concrete in the post period, can increase the density of concrete, and further, its durability. The application of slag powder not only improves the quality of concrete but also helps achieve the goal of sustainable utilization of earth resources due to the effective use of waste resources and the reduced depletion of cement. Thus, many advanced countries have applied the addition of slag powder into concrete for important constructions. So far, there has been no conclusion about the impact of slag powder on drying shrinkage and creep of concrete. This paper used slag cement type IS as an example and compared two test samples of different strengths to investigate the dynamic modulus of the concrete sample’s 28-day mean compressive strength and the ratio of its test value and predictive value. Besides, after 180 days of loading on test specimens, the test values and predictive values of drying shrinkage and creep were compared. The research results revealed: (1) The 28-day mean compressive strength and dynamic modulus of concrete: the difference between the test value and predictive value was within ±10%. (2) The concrete’s drying shrinkage during the 180-day measuring time was between 200~300(×10-6mm/mm), and the predictive value was about 415～1000(×10-6mm/mm). (3) The total deformation of test concrete specimens during the 180-day measuring time was between 4～5(×10-6mm/mm/kgf/cm2), and the predictive value ranged 1.3～4.15(×10-6mm/mm/kgf/cm2). Concluding from the aforementioned characteristics of concrete and the comparisons of test values and predictive values, the material characteristics of this concrete, on the whole, conform to the domestic standards of concrete’s dynamic modulus and creep values.