TY - JOUR
T1 - Performance and Microstructural Analysis of Lightweight Concrete Blended with Nanosilica under Sulfate Attack
AU - Vargas, Paola
AU - Marín, Natalia A.
AU - Tobón, Jorge I.
N1 - Funding Information:
This work had been endorsed by the "National Program of Projects to Strengthen Research, Development and Innovation in Postgraduate Studies at Universidad Nacional de Colombia," Code 30474.
Publisher Copyright:
© 2018 Paola Vargas et al.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - The influence of two lightweight aggregates (LWA) on concrete and the effects of cement substitution for nanosilica (NS) on the interfacial transition zone (ITZ) and cementitious matrix of concrete in resistance to attacks by magnesium sulfate (MgSO4) are researched in this work. The aggregates evaluated were perlite, which is a lightweight aggregate of open porous structure, and expanded clay (aliven) with closed porous structure. The variables included in the study were replacement percentage of coarse aggregates by lightweight coarse aggregates (0 and 100% by volume) and replacement percentage of cement by nanosilica (0 and 10% by weight). In the dosage of the mixtures, water/cementitious-material ratio constant of 0.35 was used. The LWA were characterized by XRD, XRF, and SEM techniques. Compressive strength, water absorption, and volume change in magnesium sulfate solution (according to ASTM C1012 for a period of 15 weeks) of lightweight concretes were evaluated. It was found that the nanosilica had effect on refinement in the pore system; however, the main incidence on the compressive strength and durability of lightweight concrete (LWC) was defined by the characteristics of lightweight aggregate used in its preparation.
AB - The influence of two lightweight aggregates (LWA) on concrete and the effects of cement substitution for nanosilica (NS) on the interfacial transition zone (ITZ) and cementitious matrix of concrete in resistance to attacks by magnesium sulfate (MgSO4) are researched in this work. The aggregates evaluated were perlite, which is a lightweight aggregate of open porous structure, and expanded clay (aliven) with closed porous structure. The variables included in the study were replacement percentage of coarse aggregates by lightweight coarse aggregates (0 and 100% by volume) and replacement percentage of cement by nanosilica (0 and 10% by weight). In the dosage of the mixtures, water/cementitious-material ratio constant of 0.35 was used. The LWA were characterized by XRD, XRF, and SEM techniques. Compressive strength, water absorption, and volume change in magnesium sulfate solution (according to ASTM C1012 for a period of 15 weeks) of lightweight concretes were evaluated. It was found that the nanosilica had effect on refinement in the pore system; however, the main incidence on the compressive strength and durability of lightweight concrete (LWC) was defined by the characteristics of lightweight aggregate used in its preparation.
UR - http://www.scopus.com/inward/record.url?scp=85049193135&partnerID=8YFLogxK
U2 - 10.1155/2018/2715474
DO - 10.1155/2018/2715474
M3 - Artículo
AN - SCOPUS:85049193135
SN - 1687-8086
VL - 2018
JO - Advances in Civil Engineering
JF - Advances in Civil Engineering
M1 - 2715474
ER -