Fresh, Mechanical and Absorption Characteristics of Self-Consolidating Concretes Including Low Volume Waste PET Granules

Abstract

This study evaluates the effect of waste polyethylene terephthalate (PET) granules on the fresh, mechanical and absorption characteristics of self-consolidating concretes (SCCs). Fine aggregates were replaced with different percentages (from 0% to 8%) of PET granules obtained by crushing waste PET bottles. The fresh properties of SCC containing PET granules were determined using slump flow and V-funnel flow time tests. Mechanical properties (compressive strength and splitting tensile strength tests) and absorption properties (sorptivity and water absorption tests) were evaluated. The results indicated that utilization of waste PET granules in production of SCC could be an effective way for recycling purpose. The maximum amount of PET replacement should be limited to 5%. Exceeding 5% of PET content may result in an increase of V-funnel flow time to overpass the limiting value, decrease in compressive strength, reduction in sorptivity and increase in the water absorption. The production of high performance SCC containing 5% PET granules satisfies all the requirements for SCC with satisfactory outputs.

Polyethylene terephthalate aggregates in structural lightweight concrete: a meta-analysis and review

“…F-test analysis of compressive strength data from the literature (Table 7) indicates that there is a significant difference between the results. The result of [51] is noteworthy due to the high compressive strength value achieved (Fig. 5).…”

“…However, [56] used an approach slightly different from the norm. Fine aggregate; 10 and 20% vol [57] Fine aggregate; 5% wt [58] Fine aggregate; 25, 50, 75% vol [59] Fine aggregates; 30, 40, 50, 60% wt [60] Fine aggregates; 5% wt [61] Fine aggregates; 10, 20, 30, 40, and 50% wt [49] Fine aggregate; 2.5, 5.0 and 7.5% vol [50] Fine aggregates; 1.0, 2.5 and 5% vol [34] Fine aggregates; 10, 20, 30, 40 and 100% wt [51] Fine aggregates; 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7% and 8% wt [52] Fine aggregates; 5%, 10%, 15% & 20% vol [46] Fine aggregates; 5%, 7.5%, 10%, 12.5%, 15%, 20% wt [53] Fine aggregates; 2%, 5% and 10% wt [62] Fine aggregates; 25%, 50% and 75% vol [63] Coarse aggregates; 40%, 50%, 70% and 100% wt [48] Fine aggregates; 1%, 2%, 4% and 8% vol [12] Fine aggregates; 5%, 10%, and 15% wt [47] Fine and coarse aggregates; 100% wt [64] Coarse aggregates; 100% wt Vol:. (1234567890)…”

“…Production method [24] Crushing and shredding [49] Shredding and grinding [50] Cutting and grinding [34] Melting and grinding [51] Crushing [52] Grinding [46] Shredding [53] Pulverization [48] Grinding and thermal extrusion [12] Grinding and thermal extrusion [47] Melting and crushing…”

“…5, the results indicate that beyond 20% PET replacement, the compressive strength of concrete reduces with an increase in the percentage of PET aggregates in the concrete mixture. The cohesion between the concrete matrix and PET aggregates becomes less as the percentage of PET aggregates increases, and the PET aggregates also act as a barrier between the paste and the conventional aggregate [51]. The compressive strength of mixtures reduces at each curing age with an increase in the proportion of PET aggregates to conventional aggregates.…”

“…5). A hybrid mix proportion could be obtained from [34] or [59] and [51] to achieve high compressive strength with greater incorporation of PET aggregates.…”