Infrastructure Engineering - Research Publications

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Author: San Nicolas, Rackel × End date: 2019 × Start date: 2014 ×

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    Natural carbonation of aged alkali-activated slag concretes
    Bernal, SA ; San Nicolas, R ; Provis, JL ; Mejia de Gutierrez, R ; van Deventer, JSJ (SPRINGER, 2014-04)
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    Strength Development and Thermogravimetric Investigation of High-Volume Fly Ash Binders
    Zhou, Z ; Sofi, M ; Lumantarna, E ; San Nicolas, R ; Kusuma, GH ; Mendis, P (MDPI, 2019-10)
    To address sustainability issues by facilitating the use of high-volume fly ash (HVFA) concrete in industry, this paper investigates the early age hydration properties of HVFA binders in concrete and the correlation between hydration properties and compressive strengths of the cement pastes. A new method of calculating the chemically bound water of HVFA binders was used and validated. Fly ash (FA) types used in this study were sourced from Indonesia and Australia for comparison. The water to binder (w/b) ratio was 0.4 and FA replacement levels were 40%, 50% and 60% by weight. Isothermal calorimetry tests were conducted to study the heat of hydration which was further converted to the adiabatic temperature rise. Thermo-gravimetric analysis (TGA) was employed to explore the chemically bound water (WB) of the binders. The results showed that Australian FA pastes had higher heat of hydration, adiabatic temperature rise, WB and compressive strength compared to Indonesian FA pastes. The new method of calculating chemically bound water can be successfully applied to HVFA binders. Linear correlation could be found between the WB and compressive strength.
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    Performance of lightweight hemp concrete with alkali-activated cenosphere binders exposed to elevated temperature
    Kristombu Baduge, S ; Mendis, P ; San Nicolas, R ; Nguyen, K ; Hajimohammadi, A (Elsevier BV, 2019-11-10)
    This study investigates the performance of three different types of cenosphere as a lightweight supplementary cementitious material for alkali-activated binder for lightweight carbon-negative hemp-concrete for non-load bearing applications. Mechanical performance of hemp concrete exposed to three temperatures, room temperature (RT), 300 °C and 600 °C are studied using mechanical testing, thermogravimetric analysis (TGA) and Fourier-transform Infrared Spectroscopy (FTIR). Hemp concrete with cenosphere binder remained its integrity and showed a lower load carrying capacity even after exposure to elevated temperatures. Compressive strength capacity and elastic modulus of the samples reduced with the increase of temperature and shows the composite material is more suitable for non-load bearing application considering its mechanical behavior and fire requirements. The density, age, and type of cenosphere showed effects on mechanical properties at room temperature and elevated temperatures. The study shows that alkali activated cenosphere binders can potentially be a sustainable alternative to the lime binder.