Effect of improved autogenous mortar self-healing in the alkali-aggregate reaction

Autor:	Eduardo Pereira, Ronaldo A. Medeiros-Junior, Guilherme da Silva Munhoz, Mateus E.G. Dobrovolski
Rok vydání:	2021
Předmět:	Polypropylene Materials science Expansion rate business.product_category Building and Construction chemistry.chemical_compound chemistry Self-healing Length change Microfiber General Materials Science Wetting Mortar Composite material business Alkali–aggregate reaction
Zdroj:	Cement and Concrete Composites. 117:103905
ISSN:	0958-9465
DOI:	10.1016/j.cemconcomp.2020.103905
Popis:	This article evaluated the effect of improved autogenous mortar self-healing in the alkali-aggregate reaction (AAR). Prismatic mortar specimens were cast with different contents of polypropylene microfiber and crystalline admixture. The crack-induction method (for subsequent self-healing) was the AAR accelerated mortar bar test itself. After AAR-testing, the specimens were submitted to wetting and drying cycles to stimulate the self-healing mechanism. These two approaches (AAR and self-healing steps) were alternately repeated four times. The results showed that the reference mortar and the mixture with 1% of polypropylene microfiber had the highest and lowest levels of expansion, respectively. The expansion rate was lower for the combined mixtures, although the initial values of length change were high. The visual inspection confirmed that improved autogenous self-healing could close cracks caused by AAR and promote microstructural densification.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::895f6cc5126e46e999d92d1a234872c9 https://doi.org/10.1016/j.cemconcomp.2020.103905 Zobrazit plný text záznamu Full Text from ScienceDirect