Multianalytical approach of stay-in-place polyvinyl chloride formwork concrete exposed to high temperatures

Journal of Materials Research and Technology

Fernanda Pacheco¹  Bernardo F. Tutikian²  Michel Murillo³  Carlos P. Bergmann⁴  Leandro Gómez-Plata⁵  Marcos S. Oliveira⁵  Luis F.O. Silva⁶ 

[1] Corresponding author at: Research Group in Environmental Management and Sustainability, Department of Civil and Environmental Engineering, Universidad De La Costa, Calle 58 55-66, Barranquilla, Atlántico, 080002, Colombia.;Postgraduate Program in Mining, Metallurgical and Materials Engineering, Universidade Federal do Rio Grande do Sul, Av. Osvaldo Aranha 99, Porto Alegre 90035-190, Brazil;Universidade do Vale do Rio dos Sinos, Av. Unisinos, 95, São Leopoldo, 93.022-750, Brazil;Faculdade Meridional IMED, R. Gen. Prestes Guimarães, 304, Passo Fundo, 99070-220, Rio Grande do Sul, Brazil;Research Group in Environmental Management and Sustainability, Department of Civil and Environmental Engineering, Universidad De La Costa, Calle 58 55-66, Barranquilla, Atlántico, 080002, Colombia;Universidade do Vale do Rio dos Sinos, Av. Unisinos, 95, São Leopoldo, 93.022-750, Brazil;

关键词: Stay-in-place polyvinyl chloride;    Self-compacting concrete;    High temperature;    Microstructural changes;    Thermal analyses;   

DOI  :  

来源: DOAJ

【 摘 要 】

This work presents results of the first study of the variation by exposure to high temperatures from two stay-in-place polyvinyl chloride (SIP-PVC) formwork concrete exposed to the ISO 834 fire curve. A systematic sampling based on the proximity of the fire and the spalling of the concrete was carried out and microstructural, thermal, crystallographic and spectroscopic changes were studied according to the degree of affectation by fire using SEM, TGA-DTA, XRD and FTIR. The response to high temperature exposure of the microstructure of SIP-PVC formwork concrete after fire was established using the experimental results. Results show a relationship between the microstructure of concrete paste and exposure temperature, as well as, the relationship between exposure temperature and dehydration of calcium hydrates, CSH gel and Portlandite and decarbonation of Calcite. These reactions can be considered as tracers of the degree of exposure to high temperatures from stay-in-place PVC formwork concrete.

【 授权许可】

Unknown