Kyushu shirasu volcanic-glass micro-powder as cement-replacement SCM
Domestic volcanic-glass powder ground from Kagoshima/Miyazaki shirasu, offered as a partial Portland-cement replacement and as a silica-fume / slag alternative in concrete, shotcrete, grout and refractories.
AI-assisted directory summary. Technical specifications, performance metrics, readiness and compliance labels are unverified unless individually supported and reviewed. Proposed partnership routes do not establish supplier consent, export eligibility, or willingness to sign an NDA. Confirm claims and test conditions with the linked sources and supplier before procurement or citation.
Problem solved
Silica fume is import-dependent and blast-furnace slag supply is shrinking as steelmaking shifts; a domestic natural pozzolan is needed that can replace part of cement without a new placement method.
Application contexts
- Precast concrete products needing early demould strength and later durability
- Slope-protection shotcrete / mortar in chloride, freeze-thaw or acidic soil
- Surface and deep soil mixing and grout
- Refractory castables seeking densification and a domestic silica source
Technical principle
SiO2-rich volcanic glass is milled to a controllable fineness. In alkaline pore solution it undergoes a pozzolanic reaction, consuming portlandite and forming additional C-S-H, which the company says supports early strength plus later densification. Official page states a design target of about 20–30% CO2 reduction by cement replacement and names example replacement bands of about 10–30% for ground improvement.
Typical use cases
- Partial cement replacement in factory-made precast
- Domestic substitute for silica fume in high-strength trial mixes
- SCM for slope shotcrete and soil-mixing grout
Partnership route
How global engineering teams typically engage this asset.
Helpful to include: Target cement-replacement ratio and specification (JIS A 6209 type I or II?) · Required 28-day strength and durability tests · Sample mass and shipping destination · Whether an EPD or CO2 factor can be provided
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Source & provenance
Translation review status: unreviewed. Publication does not establish technical verification or supplier endorsement.
Original language: JA.
Record updated: .
- e-Cearras
https://www.e-cearras.jp/
Primary-source candidate; evidence review: pending.
Source accessed / recorded (collector timestamp): .
Source publication date: Not recorded.
- 火山ガラス微粉末 特許第7462128号（出願人: 株式会社プリンシプルほか）
https://jglobal.jst.go.jp/detail?JGLOBAL_ID=202403002956824848
Supporting / discovery source; evidence review: pending.
Source accessed / recorded (collector timestamp): .
Source publication date: Not recorded.
Collector timestamps record when a source was stored, not an independent verification date. Source links provide context; they do not validate every specification, readiness label, certification, or proposed partnership route.