Properties of calcium silicate-based inorganic phosphate cement at room controlled conditions

Ajoku, Chinedu A.; Turatsinze, Anaclet; Abou-Chakra, Ariane

doi:10.1016/j.jobe.2022.105719

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…After, the electrical resistivity of the different mix compositions of the cement composites were measured at 14 days of being cured in a protective plastic covering at room temperature. Here it seems necessary to specify that it has been preliminarily established that the properties of CPC exhibit quasi-stability after 14 days at room temperature [4]. Three (3) specimens (measuring 40x40x160 mm 3 ) were examined for each mix design.…”

Section: Electrical Resistivitymentioning

confidence: 99%

Electrical and Thermal Properties of Wollastonitebased Inorganic Phosphate Cement Modified with Fibres and Recycled Rubber Aggregates

Ajoku¹,

Turatsinze²,

Ariane³

2023

World Congress on Civil, Structural, and Environmental Engineering

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The use of fibres and recycled rubber aggregates to improve the fracture properties of wollastonite-based inorganic phosphate cement would have corresponding effects on the functional properties of the material. In this research, cement composites were designed to incorporate rubber aggregates (i.e. 7.5-17.5 wt%), 1.5% volume fibre contents (i.e. macro polypropylene, amorphous metallic and carbon fibres), and a hybrid blend of both inert materials into the cement matrix. The electrical resistivity of the developed cement composites was measured using the Gamry device while their thermal conductivity was determined based on the guarded hot plate steady state method. It was found that the electrical resistivity of wollastonite-based inorganic phosphate cement increased with increasing curing age at room temperature. The incorporation of rubber aggregates into the cement matrix caused a significant increase and decrease in the electrical resistivity and thermal conductivity respectively, of cementitious composites formed. Meanwhile, as expected, the conductive fibres lowered the electrical resistivity and simultaneously increased the thermal conductivity of the inorganic cement. However, the polypropylene fibres increased both the electrical and thermal properties. Therefore, inert additives which have insulating properties (rubber aggregates and polypropylene fibre) favoured the production of cement composites with improved energy savings in buildings while the conductive (amorphous metallic and carbon) fibres can contribute to the material's smart potential.

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Section: Electrical Resistivitymentioning

confidence: 99%

Electrical and Thermal Properties of Wollastonitebased Inorganic Phosphate Cement Modified with Fibres and Recycled Rubber Aggregates

Ajoku¹,

Turatsinze²,

Ariane³

2023

World Congress on Civil, Structural, and Environmental Engineering

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“…Calcium silicate-based SAPG is a material that undergoes an acid-base reaction to gain strength under RT conditions [69]. Produced with an L/S ratio of 1.0 and molded in non-hermetic molds, it presented an improved mechanical response of 37.9 MPa on the first day and 55.1 MPa at 14 days.…”

Section: Calcium Silicate Powdermentioning

confidence: 99%

“…SEM images confirmed the influence of molds. Samples from PVC molds are shaped like prisms in random orientation, while polystyrene molds have structures similar to needles packed in segments [69].…”

Section: Calcium Silicate Powdermentioning

confidence: 99%

Acid Activation in Low-Carbon Binders: A Systematic Literature Review

Park,

Pimenta,

Bezerra

2023

Buildings

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Geopolymers have emerged as an alternative binding material to Ordinary Portland Cement (OPC). Recently, there has been an increase in studies exploring the synthesis of these materials using acid activation rather than traditional alkaline activation. This approach offers benefits such as good strength at an early age, better thermal properties, and a chemical activator that emits less carbon to be produced. In addition, it provides resistance to efflorescence and leaching, which are common challenges associated with alkali-activated products. This work analyzed the scientific advances in acid activation in synthesizing an alternative binder to OPC. To this end, a systematic review of the last five years of scientific literature was carried out using the Systematic Review for Engineering and Experiments (SREE) method. The results show a notable increase in research focused on acid activation over the last few years. The acid activators were always phosphate solutions, mainly phosphoric acid. Metakaolin was the most tested precursor, followed by fly ash, and volcanic ash. The research requires improvements in the methodological quality, providing data on molar ratios (Al/P, Si/Al, and Si/P), Liquid/Solid mass ratio, activator solution molarity, and curing process, in addition to statistical treatment and comparison of results. There exists a paucity of diversity in the examined precursors, activators, and additives. Future research developments need to clarify the behavior of mechanical resistance over time, better curing process, water resistance, durability, and the role of iron, magnesium, and calcium silicates and/or oxides. The paper identifies the main research gaps in the area and functions as a database, guiding researchers in selecting raw materials, dosing methodology, and curing processes.

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Mechanical behaviour of wollastonite-based cement composites incorporating fibres and recycled rubber aggregates

Ajoku

Turatsinze

Abou-Chakra

2023

Construction and Building Materials

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Properties of calcium silicate-based inorganic phosphate cement at room controlled conditions

Cited by 5 publications

References 36 publications

Electrical and Thermal Properties of Wollastonitebased Inorganic Phosphate Cement Modified with Fibres and Recycled Rubber Aggregates

Electrical and Thermal Properties of Wollastonitebased Inorganic Phosphate Cement Modified with Fibres and Recycled Rubber Aggregates

Acid Activation in Low-Carbon Binders: A Systematic Literature Review

Mechanical behaviour of wollastonite-based cement composites incorporating fibres and recycled rubber aggregates

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