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Cement and Concrete Research
Scopus
ISSN 0008-8846 · Elsevier BV · 28 artikel di indeks
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Future and emerging supplementary cementitious materials
To sustain the decarbonization of the cement industry , identifying new sources of supplementary cementitious materials (SCMs) is crucial. This review paper examines recent scientific literature on the understanding, assessment, and processing of future and emerging SCM resources. Among the SCMs…
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Effect of temperature on CO2 curing, compressive strength and microstructure of cement paste
This study investigated the effect of temperature (5 °C–50 °C) on the carbonation process, compressive strength and microstructure of CO2-cured cement paste. Results showed that the carbonation process and rate were significantly affected by temperature and time. When the curing temperature…
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The realities of additively manufactured concrete structures in practice
Extrusion-based 3D Concrete Printing (3DCP) is rapidly gaining popularity in the construction industry. Trial projects are now being realized at an increasing rate around the world to test the viability of the technology against real-world requirements. This step, from the ‘simple’ deposition of…
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Stability of hydrotalcite (Mg-Al layered double hydroxide) in presence of different anions
MgO contained in cementitious materials is experimentally observed to precipitate as poorly crystalline hydrotalcite (Mg-Al LDH). However, the geochemical modelling of hydrotalcite is challenging due to the lack of consistent thermodynamic dataset for this phase. Hydrotalcites with Mg/Al = 2 were…
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Microstructural developments of limestone calcined clay cement (LC3) pastes after long-term (3 years) hydration
LC3 is one of the most promising alternatives for a high-performance blended cement with a significantly lower clinker content and with potential for worldwide adoption. For this reason, understanding its long-term performance is relevant to ensure serviceability over its lifespan. In this paper, a…
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Effect of alkali hydroxide on calcium silicate hydrate (C-S-H)
This paper investigates the effect of KOH and NaOH on C-S-H structure and solubility. Both KOH and NaOH have a similar effect, they increase pH values and silicon concentrations, and decrease calcium concentrations. At higher alkali hydroxide concentrations, more portlandite precipitates, while…
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3D-printable engineered cementitious composites (3DP-ECC): Fresh and hardened properties
3D printing (3DP) is an emerging digital construction method for concrete materials . A major impediment to efficient 3D concrete printing (3DCP) is the need for steel reinforcement, the placement of which is incompatible with the 3DP process. Unlike plain concrete, ductile self-reinforced…
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Eco-friendly high strength, high ductility engineered cementitious composites (ECC) with substitution of fly ash by rice husk ash
In this study, an agricultural waste-rice husk ash (RHA) is proposed to substitute fly ash in high strength, high ductility engineered cementitious composites (ECC). The experimental results showed that the substitution of fly ash by RHA accelerated hydration process, promoted pozzolanic reaction…
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Seawater sea-sand engineered/strain-hardening cementitious composites (ECC/SHCC): Assessment and modeling of crack characteristics
Seawater sea-sand Engineered Cementitious Composites (SS-ECC) is a new version of ECC for marine constructions facing the scarcity of freshwater and river/manufactured sand. This study aims to assess and model the crack characteristics of SS-ECC, which are critical for its applications with…
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Effect of relative humidity on the carbonation rate of portlandite, calcium silicate hydrates and ettringite
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Advances in alkali-activation of clay minerals
To future-proof alkali-activation technology, there is a need to look beyond well-established precursors such as fly ash and blast furnace slag, due to resource competition, geographical distribution and technical limitations. Clay minerals are abundant and diverse aluminosilicate resources…
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The reaction between metakaolin and limestone and its effect in porosity refinement and mechanical properties
In limestone calcined clay cements (LC3), more hemicarboaluminate and monocarboaluminate is observed, as compared to other blended cements, from the reaction of metakaolin with limestone. In this study, it is shown that the formation of these carboaluminate phases, predominantly occurs during a…
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Improving printability of limestone-calcined clay-based cementitious materials by using viscosity-modifying admixture
In 3D concrete printing (3DCP), it is necessary to meet contradicting rheological requirements: high fluidity during pumping and extrusion, and high stability and viscosity at rest to build the layered structure. In this paper, the impact of the hydroxypropyl methylcellulose (HPMC)-based…