Strength, chloride resistance and corrosion reinforced of High-strength concrete

Abstract

Typical low-calcium fly ash (LC-FA) and silica fume SF 90 (SF-90) was used as a binder in the mixture of high-strength concrete (HSC), replacing (20-40)% and (5-15)% of the weight of Portland cement, respectively. The slump of fresh HSC mixtures, compressive strength, density and water absorption of HSC samples were investigated. Applying the standard NT Build 356 combined with standard ASTM C1202-97 for assessment of the chloride resistance and the corrosion resistance reinforced of tested concrete produced using high-calcium fly ash and Silica fume was studied in this work. The results show that the compressive strength of examined concrete decreased with increasing LC-FA content and was lower than the concrete used mix control, while the compressive strength of concrete mixtures with SF-90 at 5%, 10% and 15% by mass cement was higher than the sample tested with mix control and significantly higher than the LC-FA concrete mixtures. LC-FA and SF-90 in HSC decreased the charge passed and tends to decrease, while the times of initial crack of the test specimens gain increased with increasing LC-FA and SF-90 contents. The chloride ion penetrability of HSC is very low.

Performance Assessment of the Post-Tensioned Anchorage Zone Using High-Strength Concrete Considering Confinement Effect

“…The cement matrix is denser than normal concrete (NC) [ 2 ]. HSC uses materials less than NC, but HSC shows higher strength and durability than NC [ 2 , 3 , 4 ]. HSC has a good carbonation resistance due to having a dense cement matrix and high compressive strength [ 5 ].…”

“…HSC has a good carbonation resistance due to having a dense cement matrix and high compressive strength [ 5 ]. In addition, HSC shows good resistance to chloride penetration and freezing–thawing [ 3 , 6 ]. Not only does it have strength and durability aspects, but HSC is also used widely in the construction of high-rise buildings [ 7 ] and long-span bridges [ 8 ].…”