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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesVolcanic ash can be used in some mortar and concrete, but it does not automatically make a mix stronger or lower-carbon. Its suitability depends on the ash’s properties, the mix design and the intended use. For a construction project, the practical question is whether tested ash performs to the project’s requirements—and whether replacing cement delivers a verified environmental benefit.
Can volcanic ash be used in concrete?
Yes. The U.S. Geological Survey says ash can be an additive in mortar or concrete depending on its properties. Volcanic ash is not a uniform material: grain size, how easily grains break apart (friability), surface coatings and chemistry can affect how it behaves. Processing and the intended application matter too. The USGS advises seeking technical expertise to assess whether a particular deposit is suitable for a particular use.
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There are documented examples, but they are not proof that every ash deposit will work in the same way. The USGS describes hydraulic mortars associated with Santorini ash and pumice clasts used in harbours and the Suez Canal, as well as local concrete blocks made with ash from Ambae’s 2017–2018 eruptions. These examples do not establish a universal formula or quantify strength gains. USGS guidance on volcanic ash reuse
Does volcanic ash make concrete stronger?
Not necessarily. Calling a material a pozzolan does not by itself establish that it will increase strength. Concrete performance depends on the ash, its proportion in the binder, water demand, curing and the rest of the mix design. Strength also changes over time, so early-age and later-age results may tell different parts of the story.
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ASTM C618-26 is listed as the active specification for coal ash and raw or calcined natural pozzolan used in concrete. Its listed evaluation areas include fineness, strength activity index, water requirement, soundness and autoclave expansion or contraction. Meeting a material specification is a qualification step—not proof that a given deposit is appropriate for every project or that the finished concrete meets its design requirements. ASTM also notes that finely divided materials may reduce entrained air content; where air content is specified, it should be maintained. Check the current edition and applicable project requirements when specifying a material. ASTM C618 listing
What should be tested before using ash in a project?
Start by characterizing the specific source, then evaluate the proposed blend in the context of the project. NIST notes, in its broader work on alternative cementitious materials, that performance can depend on material structure, composition and hydration kinetics; alternative formulations can behave differently from conventional ones. That is general guidance, not a volcanic-ash-specific test result. NIST cementitious materials project
A practical comparison between an ash blend and conventional concrete should cover:
- Source and material properties: deposit location, composition, fineness, grain characteristics and any coatings or processing.
- Mixing and placement: replacement proportion, water demand, workability, setting behaviour and air entrainment.
- Performance over time: early and later strength, soundness, curing needs and durability under the project’s actual exposure conditions.
- Project feasibility: consistent supply, quality control and the testing required to demonstrate compliance with the project specification.
- Environmental comparison: lifecycle emissions for the proposed mix and a suitable project baseline, using comparable assumptions.
NIST’s guide to high-volume fly-ash concrete discusses characterization, mix proportioning, curing and performance evaluation. It concerns fly ash, not volcanic ash, so it is useful as a process analogy—not direct evidence of how a volcanic-ash mix will perform. NIST guide to high-volume fly-ash concrete
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Can volcanic ash make concrete greener?
Potentially, if a suitable ash replaces some Portland cement and the resulting concrete meets project requirements with a lower lifecycle impact. But the sources cited here do not quantify a volcanic-ash-specific emissions saving. A claim of reduced emissions needs a project-specific comparison that accounts for the materials, processing, transport, mix performance and service life involved.
NIST says the cement and concrete industry accounts for up to 8% of CO2 emissions; that is an industry-level figure, not an estimate of emissions from volcanic-ash concrete or of savings from using it. NIST Sustainable Engineered Materials
How to decide whether an ash blend is right for a project
- Define the application. Set the required strength, durability, exposure conditions, placement needs and applicable specifications before selecting an additive.
- Identify and characterize the source. Do not assume that ash from one eruption or location represents another; assess relevant physical and chemical properties with qualified technical support.
- Qualify the material and develop the mix. Use applicable standards, including ASTM C618 where relevant, and evaluate the proposed replacement level rather than relying on the material name.
- Test performance against the project baseline. Compare workability, air content, setting, early and later strength, curing and durability under relevant conditions.
- Assess environmental impact on a like-for-like basis. Compare lifecycle impacts for mixes intended to deliver the same function and service life; do not infer a carbon saving solely from reduced Portland cement content.
Volcanic ash is a possible supplementary material, not a drop-in guarantee. Its value for a city project depends on whether a specific source can be qualified, supplied consistently and shown to meet performance and environmental targets.
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