Skin friction coefficient change on cement grouts for micropiles due to sulfate attack. (28th February 2018)

• Record Type: Journal Article
• Authors: Pastor, José L.; Ortega, J. Marcos; Climent, Miguel A.; Sánchez, Isidro
• Is Part Of: Construction & building materials. Volume 163(2018)
• Page Start: 80
• Page End: 86
• Publication Date: 2018-02-28
• Subjects: Sulfate attack -- Degradation -- Skin friction -- Micropiles; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.12.091
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Direct shear apparatus can be used to determine friction coefficient of cement pastes. Skin friction value for rough samples is bigger than for smooth ones. Coefficient of friction increases with time of immersion in sulfate solution. Sulfate attack do not have a negative effect on friction in conditions of this work. Abstract: This paper presents a study of skin friction change of cement pastes used for micropiles as a geotechnical foundation when grout surface is affected by sulfate attack. In this research skin friction coefficient between cement paste – cement paste was measured, studying change in friction depending on the initial roughness of samples. Tests were performed after 3 and 6 months of immersion in a 15% Na2 SO4 solution. Results show that sulfate attack increases skin friction coefficient for both surface finishes, concluding that this attack does not have a negative effect on friction in the experimental conditions of this work.