Properties of binary eco-cement mortars made with reed ash from Mozambique
In Mozambique, eco‑cement production is limited by the scarcity of conventional supplementary cementitious materials. Giant reed, an abundant biomass, offers an alternative for low‑carbon cements. This study characterizes washed giant reed ash (GRA) and evaluates its use in binary systems with 10% a...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:dnet:digitalcsic_::c303a4d137c9385dde97c0f5c3183025 |
| Acceso en línea: | http://hdl.handle.net/10261/432143 https://doi.org/10.1080/21650373.2026.2666619 |
| Access Level: | acceso abierto |
| Palabra clave: | Reed ash Pozzolanic admixture Binary eco-cements Physical and mechanical properties Microporosity Macroporosity Make cities and human settlements inclusive, safe, resilient and sustainable |
| Sumario: | In Mozambique, eco‑cement production is limited by the scarcity of conventional supplementary cementitious materials. Giant reed, an abundant biomass, offers an alternative for low‑carbon cements. This study characterizes washed giant reed ash (GRA) and evaluates its use in binary systems with 10% and 20% replacement. The ash is highly siliceous (92.5% SiO2) and shows early pozzolanic activity, fixing 94% lime at 28 days. Blended pastes meet chemical and rheological requirements, though water demand increases by 7.3% and 11.5%. In mortars, GRA reduces heat of hydration by up to 13.3%. Total water absorption rises 20.5% (10%) and 29.5% (20%), and porosity increases 23–27%. Despite this, electrical resistivity increases, with the q‑parameter rising from 0.23 to 0.63 at 90 days. At 90 days, the 10% GRA mortar gains 3% strength, while the 20% mix loses only 2%. All mixtures up to 20% maintain the reference cement strength class. |
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