Abstract
The main aim of this research is to evaluate the performance of Nano silica self-compacting concrete which is subjected to severe saline conditions that contain sulfates and chlorides at concentrations similar to those existing in the soils and ground water of the middle and southern parts of Iraq. For this purpose, ordinary and sulfate resistant Portland cement without and with 3% Nano silica addition by weight of cementitious materials were used. Splitting tensile strength, flexural strength, static modulus of elasticity and ultrasonic pulse velocity were investigated for all exposure conditions and all types of mixes of self-compacting concrete at ages of 28, 60, 90, 120 and 180 days. Test results revealed that the inclusion of Nano Silica in concrete mixes improved clearly the mechanical properties of self-compacting concrete compared with reference concrete.
Highlights
Self-compacting concrete (SCC) has been defined as the concrete that does not require vibration for placing and compaction
8.1 Splitting Tensile strength The results of splitting tensile strength of SCC specimens cured in tap water and other Aggressive solution exposer are shown in Table [13] and Figure (2-a,b,c)
Solution revealed the increment in splitting tensile strength up to 180 days of exposure, due to the presence of Nano Silica, which has increased the strength of concrete. while the reference SCC specimens reveal the increment in splitting tensile strength up to 90 days and 120 days of exposure for (OR and SRPC- 0%NS (SR)) concretes respectively; after that a decrease in strength occurred up to 180 days
Summary
Self-compacting concrete (SCC) has been defined as the concrete that does not require vibration for placing and compaction. SCC has been developed in Japan to get durable concrete structures due to increase of the homogeneity, which is attributed to improve the characteristics of SCC in fresh state; filling ability, passing ability and segregation resistance, in addition to enhancing the hardened properties of SCC. The absence of compaction of the surface layer due to the difficulties of vibration in narrow spaces between the formwork and the re-bars, which can be characterized as a key factor of poor durability performance of reinforced concrete structures subjected to aggressive environments. Overcoming this was one of the main reasons for the original development of SCC in Japan (Singh and Thombre, 2013)
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