Search the SPREP Catalogue

Advanced Search
Refine Search Results

Tags / Keywords

Language

Available Online

Tags / Keywords

Available Online

4 result(s) found.

Sort by

You searched for

  • Tags / Keywords volcanic deposition
    X
  • Tags / Keywords ppcr
    X
clear
Volcanic Ash as a Sustainable Binder Material: An Extensive Review
Environmental Monitoring and Governance
Available Online

Etxeberria, Miren

,

Játiva, Andrés

,

Ruales, Evelyn

2021
The construction industry is affected by the constant growth in the populations of urban areas. The demand for cement production has an increasing environmental impact, and there are urgent demands for alternative sustainable solutions. Volcanic ash (VA) is an abundant lowcost material that, because of its chemical composition and amorphous atomic structure, has been considered as a suitable material to replace Portland cement clinker for use as a binder in cement production. In the last decade, there has been interest in using alkali-activated VA material as an alternative material to replace ordinary Portland cement. In this way, a valuable product may be derived from a currently under-utilized material. Additionally, alkali-activated VA-based materials may be suitable for building applications because of their good densification behaviour, mechanical properties and low porosity. This article describes the most relevant findings from researchers around the world on the role of the chemical composition and mineral contents of VA on reactivity during the alkali-activation reaction; the effect of synthesis factors, which include the concentration of the alkaline activator, the solution-to-binder ratio and the curing conditions, on the properties of alkali-activated VA-based materials; and the mechanical performance and durability properties of these materials.
The Use of Volcanic Powder as a Cement Replacement for the Development of Sustainable Mortars
Environmental Monitoring and Governance
Available Online

Letelier, Viviana

,

Ortega, Jose Marcos

,

Tremino, Rosa Maria

,

et al

2020
Currently, reduction of environmental e ects of the cement industry is an issue of global interest and one of the alternatives is to replace clinker with additions such as volcanic powder. The purpose of this work is to study the influence of up to 400 hardening days of volcanic powder, obtained from the last eruption of the Calbuco volcano (Chile), on the pore structure, mechanical performance, and durability-related properties of mortars which incorporate up to 20% volcanic powder as a substitution for clinker. In addition, an evaluation of greenhouse gases emissions was performed in order to quantify the possible environmental benefits of incorporating the volcanic powder in the mortars. The results obtained indicated that mortars with contents of 10% and 20% of volcanic powder had adequate service properties and improved all durability-related properties overall as compared with those noted for ordinary Portland cement. Additionally, the use of up to 20% volcanic powder makes it possible to reduce the CO2 emissions of mortars by almost 20%, demonstrating the advantages of incorporating this addition in mortars.
Operations Manual - Regional Technical Support Mechanism (RTSM) and Rapid Response Fund (RRF)
SPREP Publications, Climate Change Resilience
Available Online

SPREP

2014
The Regional Technical Support Mechanism (RTSM) and Rapid Response Fund (RRF) is a collaborative undertaking of all Council of Regional Organisations in the Pacific (CROP) agencies and their associated development partners and donors. It is a true reflection of the Pacific island region, which promotes the spirit of cooperation and collaboration. The establishment of the RTSM and RRF is a step towards a ‘transformative change’ that is taken by the CROP agencies, to efficiently serve the priority and needs of Pacific Island Countries and Territories in relation to climate change adaptation and mitigation The purpose of this Manual is to guide the members of the RTSM Project Committee (PC), the Working Arm of the CEO Subcommittee on Climate Change and Disaster Resilient Development (WARD) and the RTSM Coordinator (RC) on the operations of the RTSM and associated RRF. It sets out the standards of probity, transparency and accountability that contributors and potential contributors to the Fund expect in the governance and operations of both the RTSM and RRF. The Manual includes an RTSM & RRF Policies and Procedures which lists the types of assistance available, and how to request assistance under the RRF. As part of the ‘scaling up of good practices’ approach, the standards as set out in the Manual also provide an example for countries that do not have Pilot Programme for Climate Resilience (PPCR) country tracks and are interested in replicating such a mechanism to administer and manage climate change funding. The RTSM PC and the WARD may approve amendments to the Manual and associated RTSM and RRF Policies and Procedures.
Geological history of Guam pt 1: Volcanic deposition - Natural History of Guam
Environmental Monitoring and Governance
Available Online
Geological history of Guam and its volcanic deposition

www.sprep.org © 2021 - 2024. All rights reserved

Login