Comparative study on uniaxial and triaxial strength of plastic concrete containing nano silica. (30th May 2020)

• Record Type: Journal Article
• Authors: Farajzadehha, Soroush; Ziaei Moayed, Reza; Mahdikhani, Mahdi
• Is Part Of: Construction & building materials. Volume 244(2020)
• Publication Date: 2020-05-30
• Subjects: Plastic concrete -- Nano silica -- Triaxial test -- Uniaxial test -- Cut-off wall; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.118212
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Obtaining strength parameter of PC by performing uniaxial and triaxial compressive strength. Obtaining elastic modulus of PC from stress–strain graph in UU situation. The effect of confined pressure on the mechanical properties of PC was investigated.Obtaining the shear strength parameter (ø and c) of PC. Abstract: Plastic concrete is used in the manufacture of cut off wall and its mechanical properties is important for performance of dam. In this paper, in order to investigate the durability and mechanical properties of plastic concrete, uniaxial and triaxial compressive strength tests were performed on plastic concrete specimens in different ages (7, 14, 28, 56 and 90 days) and different percentage of replacement cement by nano silica (0, 1.5, 3, 4.5 and 6%) and compressive strength, the stress–strain behavior, elastic modulus, shear strength parameters of plastic concrete have been evaluated. According to the result, as the age of the specimen increases, elastic modulus, compressive strength and triaxial strength of the plastic concrete enhances. Furthermore, although by increasing the amount of nano silica the strength parameters of plastic concrete are improved and workability of concrete is reduced and the amount of elastic modulus of the specimen is almost constant. The results of shear strength parameters also show that the addition of up to 3% of nano silica increases the cohesion and internal friction angle decreases and with over 3% nano silica this trend is reversed and cohesion decreases and friction angle increases.