Self-healing potential of supplementary cementitious materials in cement mortars: Sorptivity and pore structure
| Autor: | Diane Ruth Gardner, Hussameldin Taha, Riccardo Maddalena |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Autogenous healing
Building construction Absorption of water Materials science Silica fume Sorptivity Engineering (General). Civil engineering (General) law.invention Mortar Portland cement Cement replacement Pulverised fuel ash law Ground granulated blast-furnace slag Cementitious TA1-2040 Composite material TH1-9745 |
| Zdroj: | Developments in the Built Environment, Vol 6, Iss, Pp 100044-(2021) |
| ISSN: | 2666-1659 |
| Popis: | This paper presents the autogenic self-healing potential of Portland cement (PC) blends made with conventional supplementary cementitious materials (SCMs), to improve the water-tightness by reducing the overall pore size. Mortar samples were prepared by mixing PC, sand and water, and partially replacing PC by either silica fume (SF), pulverised fuel ash (PFA), or ground granulated blast-furnace slag (GGBS). Damaged samples were subjected to a water bath to heal microcracks and recover the water-tightness, by further hydration of the starting minerals. Water absorption and density measurements in undamaged, damaged and healed conditions were used to determine the autogenous healing potential of SCMs mixes, showing a post-healing absorption recovery of up to 68% compared to the mix with PC only. Thermal analysis, XRD and MIP measurements confirmed the capability of SCMs to promote the formation of hydrated phases, and reduce the overall pore size by more than 88% compared to PC mixes. |
| Databáze: | OpenAIRE |
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