A Short Study to Test the Compliance of Various Pakistani Ordinary Portland Cements with ASTM Composition Standards

Shahzadi, P.; Shahnaz, Akhtar; Khan, Muhammad Saeed; Rana, Bhavin; Chaudry, M. Y.; Yasmeen, Samreen

doi:10.15228/2013.v03.i04.p04

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…To obtain the maximum theoretical CO 2 capture, it was assumed that all the cement paste presented in the aggregates is composed of CEM type I with, at least, 95% of Portland clinker. It was also considered that cement is composed of 60% CaO [74,75] and that all the calcium compounds present in the cement paste can react with CO 2 . Taking into account these assumptions, the maximum theoretical CO 2 capture was calculated based on Rc values (Table 2) and considering an average value of 14% for the cement content in all RAs [76], with the exception of CA-L where its composition is known (11% cement).…”

Section: Co 2 Uptake Efficiency Of Ras and Calculation Of Contributio...mentioning

confidence: 99%

Pathway to Carbon Neutrality in the Cement Industry: CO2 Uptake by Recycled Aggregates from Construction and Demolition Waste

Bastos,

Brazão Farinha,

Maia Pederneiras

et al. 2024

Applied Sciences

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Cementitious materials can capture CO2 through carbonation reaction during their service life and post-demolition. Indeed, construction and demolition waste (CDW) still have some potential for carbonation as they contain concrete and cement-based mortars. This research consists of an experimental programme to evaluate the CO2 capture of recycling aggregates (RAs) from CDW. Two types of CDW were studied, namely mixed recycled aggregates (MRAs) and recycled concrete aggregates (RCAs). The recycled aggregates were submitted to forced and accelerated carbonation at 23 °C, 60% relative humidity and 25% of CO2 concentration. This study contributes to the existing literature by investigating more realistic RA sources that have already absorbed atmospheric CO2 during their service life. From the experimental campaign, the results show that RCAs have higher carbonation potential when compared to MRAs due to the higher cementitious material content (Rc) and to the degree of natural carbonation. The recycled aggregates’ maximum CO2 capture was assessed by thermogravimetric analysis (TGA) at different CO2 exposure times. It was verified that the maximum CO2 capture, respectively, for MRAs and RCAs, occurred after 5 h and 12 h of exposition. In short, CDW captured from 5 wt.% to 35 wt.% of CO2 per tonne of cement paste, which corresponds to 0.6% to 4.1% per tonne of aggregate. It was concluded that the carbonation process of CDW has the potential to sequester from 123 kg to 225 kg of CO2 per tonne of cement paste for MRAs and 52 up to 491 kg of CO2 per tonne of cement paste for RCAs.

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Section: Co 2 Uptake Efficiency Of Ras and Calculation Of Contributio...mentioning

confidence: 99%

Pathway to Carbon Neutrality in the Cement Industry: CO2 Uptake by Recycled Aggregates from Construction and Demolition Waste

Bastos,

Brazão Farinha,

Maia Pederneiras

et al. 2024

Applied Sciences

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“…Other cements of acid resistant properties as the sodium silicate and geopolymers do not contain lime. A less abundant cement based on magnesium is the Sorel cement applied mainly as a flouring material (10).…”

Section: Other Cementsmentioning

confidence: 99%

Cementing materials from the pharaohs to the 21st century

Ghorab

2022

ERU Research Journal

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Human's ability to live comfortably depends on their housing. Homes must be safe, strong, and environmentally friendly. Construction materials have changed over time in accordance with the conditions. They ranged from stone structures to palm grids and mountain caverns. Bricks that had been burned and treated were also known. Builders were accustomed with using natural resources like animal and plant glue to bond the decorative pieces and increase the workability of mortars. In areas where its color wouldn't be an issue, bitumen was extensively employed as a man-made organic glue. It is the primary part of asphalt pavement nowadays. Natural stones represented strong building elements among these resources. The ancient people mastered their challenging quarrying techniques and used rocks and stones exclusively in their construction.

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Co2 Uptake by Recycled Aggregates Obtained from Construction and Demolition Waste

Bastos,

Brazão Farinha,

Maia Pederneiras

et al. 2023

Preprint

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A Short Study to Test the Compliance of Various Pakistani Ordinary Portland Cements with ASTM Composition Standards

Cited by 3 publications

References 1 publication

Pathway to Carbon Neutrality in the Cement Industry: CO2 Uptake by Recycled Aggregates from Construction and Demolition Waste

Pathway to Carbon Neutrality in the Cement Industry: CO2 Uptake by Recycled Aggregates from Construction and Demolition Waste

Cementing materials from the pharaohs to the 21st century

Co2 Uptake by Recycled Aggregates Obtained from Construction and Demolition Waste

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