ADAMOU AUGUSTIN EKEN NGANDJUI

Mr. ADAMOU AUGUSTIN EKEN NGANDJUI

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Research Focus & Metrics

Academic Career Length

3Years (2024-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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3 November 2026 in Recycling
Verified
Journal Article
Open access
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ANADAMOU AUGUSTIN EKEN NGANDJUI
ADAMOU AUGUSTIN EKEN NGANDJUI
Nasser YimenNasser Yimen
Nasser Yimen
JMJacque Richard Mache
Jacque Richard Mache
TBThierry Roger Mondoué Bouodo
Thierry Roger Mondoué Bouodo
TTThéodore Tchotang
Théodore Tchotang
The acid durability of recycled-aggregate concrete (RAC) remains largely undocumented in sub-Saharan Africa, and the small, collinear datasets of such campaigns are rarely released. Three concretes (natural, partially recycled and fully recycled) were cast with quarry aggregates or aggregates from two demolition-waste sources in Yaoundé, Cameroon, characterized to French and European standards. After 90 days of water curing (25.4 to 25.9 MPa), specimens were immersed in nominally 5% sulfuric or hydrochloric acid, and residual compressive strength and mass loss were measured on one specimen per age after 7, 14, 21, 28 and 90 days of immersion. After 90 days in sulfuric acid, the natural concrete retained 64% of its strength and the recycled concretes 31% and 27%; in hydrochloric acid, retention was 44%, 44% and 55%. At nearly equal mass loss, the recycled concretes retained 7.4 MPa in sulfuric acid against 12.6 MPa in hydrochloric acid, consistent with an expansive mechanism but also with the higher acid dose of the sulfuric bath; reaction products were not analysed. Mix-descriptor collinearity is quantified, degradation kinetics are described by monotonic trends and simple empirical laws, and aggregate sources are pre-qualified by an anchored multi-criteria screening index. The dataset is released with the article.