Comparative carbon emission assessments of recycled and natural aggregate concrete: Environmental influence of cement content

Sabău, Marian; Bompa, D.V.; Silva, Luis

doi:10.1016/j.gsf.2021.101235

Cited by 66 publications

(17 citation statements)

References 43 publications

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“…Cement is associated with about 1000 kg CO 2 eq./t embodied carbon and 5500 MJ/t embodied energy, which is the main cause of the environmental load of concrete [84,85]. Table 5 shows that the styrene-acrylic copolymer had high values of embodied energy and embodied carbon (i.e., 37,400 MJ/t and 1500 kg CO 2 eq./t, respectively) which were comparable to the plastic materials, as shown in Table 4, since SA is also formed through the polymerization of ethane [80,86]. A prototype of a 6-m long PCC tube network (shown in Figure 11) was manufactured and used as a reference for the environmental assessment in this paper.…”

Section: Environmental Assessmentsmentioning

confidence: 99%

Performance of Polymer Cementitious Coatings for High-Voltage Electrical Infrastructure

Li²,

Bompa

et al. 2021

Infrastructures

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This paper investigates the electrical, thermal and mechanical properties as well as the environmental performance of polymer cementitious composites (PCCs) as sustainable coating materials for underground power cables and as high-voltage insulators. Particular focus is placed on the optimised mix design and the effect of the manufacturing method on the performance of PCCs, incorporating liquid styrene and acrylic (SA) monomers, wollastonite and muscovite. Microstructural investigations, together with results from strength tests, indicate that the manufacturing method is a key performance parameter. Experimental results show that PCC mixes containing 25% SA emulsion, 12.5% wollastonite and no muscovite provide the most favourable dielectric properties from the mixes investigated. The PCC material has a dielectric strength up to 16.5 kV/mm and a dielectric loss factor lower than 0.12. Additional experiments also show that PCC has good thermal stability and thermal conductivity. The mechanical strength tests indicate that PCC specimens possess reliable strengths which are applicable in structural design. Environmental assessments also show that PCCs possess significantly lower embodied energy and embodied carbon than conventional plastic insulating materials.

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Section: Environmental Assessmentsmentioning

confidence: 99%

Performance of Polymer Cementitious Coatings for High-Voltage Electrical Infrastructure

Li²,

Bompa

et al. 2021

Infrastructures

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“…Basic sustainability analysis was carried out by assessing the embodied carbon of each mix, based on the embodied carbon values of its constituents [2]. The embodied carbon considered the effects of various greenhouse gases on the climate by a CO 2 equivalence (CO 2 e) [64].…”

Section: Embodied Carbonmentioning

confidence: 99%

“…Concrete is the second-most consumed resource across the globe after water and the production of its main constituent, the cement, accounts for 8% of the total global carbon emissions [1]. To minimise the embodied carbon in construction, implementation of alternative binders should be accelerated [2]. Alkali activated materials are a promising alternative to conventional concretes for some applications.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Fresh Properties of Multi-Binder Geopolymer Mortars Incorporating Recycled Rubber Particles

Abdelmonim

Bompa

2021

Infrastructures

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This paper examines the performance of multi-binder conventional geopolymer mixes (GCMs) with relatively high early strength, achieved through curing at ambient temperature. Mixes incorporating ground granulated blast-furnace slag (GGBS), fly ash (FA) and microsilica (MS) and sodium metasilicate anhydrous, were assessed in terms of workability, mechanical properties and embodied carbon. A cement mortar was also prepared for the sake of comparison. The best performing GCM was then used as a reference for rubberised geopolymer mixes (RuGM) in which the mineral aggregates were replaced by recycled rubber particles in proportions up to 30% by volume. Experimental results were combined with embodied carbon estimations in a multi-criteria assessment to evaluate the performance of each material. A mix with a 75/25 GGBS-to-FA ratio, in which 5% MS was added, had the best performance in terms of strength, workability, water absorption and environmental impact. The compressive strength was above 50 MPa, similar to that of the cement mortar. The latter had significantly higher embodied carbon, with factors ranging between 3.48 to 4.20, compared with the CGM mixes. The presence of rubber particles reduced the mechanical properties of RuGM proportionally with the rubber amount, but had similar workability and embodied carbon to CGMs. Finally, a strength degradation model is validated against the tests from this paper and literature to estimate the compressive strength of RuGM, providing reliable predictions over a wide range of rubber contents.

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“…Cement and other artificial concrete materials are now widely used in the world, producing billions of tons solid waste each year, which have a significant negative impact on the environment and urge us to consider building materials and their admixtures with the green concept of sustainable development. [1,2] The concrete water-reducing agent, also known as plasticizer, is one of the admixtures with a large-scale applications in cement. Plasticizer can maintain the fine workability of concrete construction by reducing water consumption and enhancing concrete strength.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and property of EPEG‐based polycarboxylate ether superplasticizers via RAFT polymerization

Chen

Tang

Zhang

et al. 2022

Polymer Engineering & Sci

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Comparative carbon emission assessments of recycled and natural aggregate concrete: Environmental influence of cement content

Cited by 66 publications

References 43 publications

Performance of Polymer Cementitious Coatings for High-Voltage Electrical Infrastructure

Performance of Polymer Cementitious Coatings for High-Voltage Electrical Infrastructure

Mechanical and Fresh Properties of Multi-Binder Geopolymer Mortars Incorporating Recycled Rubber Particles

Synthesis and property of EPEG‐based polycarboxylate ether superplasticizers via RAFT polymerization

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