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The safe disposal of an enormous amount of waste glass (WG) in several countries has become a severe environmental issue. In contrast, concrete production consumes a large amount of natural resources and contributes to environmental greenhouse gas emissions. It is widely known that many kinds of waste may be utilized rather than raw materials in the field of construction materials. However, for the wide use of waste in building construction, it is necessary to ensure that the characteristics of the resulting building materials are appropriate. Recycled glass waste is one of the most attractive waste materials that can be used to create sustainable concrete compounds.
Color | Chemical Compositions | Refs. | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | CaO | Na2O | Al2O3 | MgO | Fe2O3 | K2O | SO3 | TiO2 | Cr2O3 | Others | ||
White | 70.39 | 6.43 | 16.66 | 2.41 | 2.59 | 0.32 | 0.23 | 0.19 | 0.08 | - | 0.04 (MnO), 0.02 (Cl) | [16] |
Clear | 72.42 | 11.50 | 13.64 | 1.44 | 0.32 | 0.07 | 0.35 | 0.21 | 0.035 | 0.002 | - | [17] |
Flint | 70.65 | 10.70 | 13.25 | 1.75 | 2.45 | 0.45 | 0.55 | 0.45 | - | - | - | [18] |
Amber | 70.01 | 10.00 | 15.35 | 3.20 | 1.46 | - | 0.82 | 0.06 | 0.11 | - | 0.04 (MnO) | [16] |
Brown | 71.19 | 10.38 | 13.16 | 2.38 | 1.70 | 0.29 | 0.70 | 0.04 | 0.15 | - | - | [19] |
Green | 72.05 | 10.26 | 14.31 | 2.81 | 0.90 | - | 0.52 | 0.07 | 0.11 | - | 0.04 (MnO) | [16] |
Type | Uses | Chemical Compositions | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | K2O | Na2O | Al2O3 | MgO | PbO | BaO | CaO | B2O3 | Others | ||
Barium glasses | Optical-dense barium crown | 36 | 4 | 41 | 10 | 9% ZnO | |||||
Color TV panel | 65 | 9 | 7 | 2 | 2 | 2 | 2 | 2 | 10% SrO | ||
Soda-Lime Glasses | Containers | 66–75 | 0.1–3 | 12–16 | 0.7–7 | 0.1–5 | 6–12 | ||||
Light bulbs | 71–73 | ||||||||||
Float sheet | 73–74 | ||||||||||
Tempered ovenware | 0.5–1.5 | 13.5–15 | |||||||||
Lead glasses | Color TV funnel | 54 | 9 | 4 | 2 | 23 | |||||
Electronic parts | 56 | 9 | 4 | 2 | 29 | ||||||
Neon tubing | 63 | 6 | 8 | 1 | 22 | ||||||
Optical dense flint | 32 | 2 | 1 | 65 | |||||||
Aluminosilicate glasses | Combustion tubes | 62 | 1 | 17 | 7 | 8 | 5 | ||||
Resistor substrates | 57 | 16 | 7 | 6 | 10 | 4 | |||||
Fiberglass | 64.5 | 0.5 | 24.5 | 10.5 | |||||||
Borosilicate | Chemical apparatus | 81 | 4 | 2 | 13 | ||||||
Tungsten sealing | 74 | 4 | 1 | 15 | |||||||
Pharmaceutical | 72 | 1 | 7 | 6 | 11 |
Property | Refs. | |
---|---|---|
Specific gravity | 2.4–2.8 2.51 (Green), 2.52 (Brown) |
[22] |
Fineness Modulus | 4.25 0.44–3.29 |
[23][24] |
Bulk Density | 1360 kg/m3 | [25][26] |
Shape Index (%) | 30.5 | |
Flakiness Index | 84.3–94.7 | [27] |
Property | Refs. | |
---|---|---|
CBR (California bearing ratio) (%) | Approx. 50–75. | [28] |
Los Angeles Value (%) | 38.4 | [25][27] |
24.8–27.8 | [26] | |
27.7 | [29] | |
Friction Angle | critical = 38 (Loose recycled glass) | [28] |
critical = 51–61 (Dense recycled glass) |
The smooth surface and low absorption capacity of WG are also important factors in increasing workability [30][31]. For example, Ali and Al-Tersawy [32] substitute fine aggregate in self-compacting concrete (SCC) mixes with recycled WG at levels of 10% to 50% by volume. Constant content of water–cement ratio and various superplasticizer doses have been used. They stated that slump flow increased by 2%, 5%, 8%, 11%, and 85%, with the incorporating of 10%, 20%, 30%, 40% and 50% of WG, respectively. In addition, Liu, Wei, Zou, Zhou and Jian [33] substitute fine aggregate in ultra-high-performance concrete (UHPC) mixes with recycled liquid crystal display (CRT) glass at levels of 25% to 100% by volume. Constant content of water–cement ratio and various superplasticizer (SP) doses have been used. Moreover, they stated that flowability increased by 11, 14, 16, and 12 mm, compared to the control sample, incorporating 25%, 50%, 75%, and 100% WG, respectively. Enhancing the workability by including WG is a benefit of utilizing this recycled material [34][35][36][37]. There is potential to utilize glass to create HPC in which high workability is necessary. In addition, WG can be used to boost workability rather than employing admixtures such as HRWR or superplasticizers [38][39][40][41].
including waste glass into the mixes lowered workability. Nevertheless, such a decrease has been associated with sharp edges, higher glass particle aspect ratio, and angular form, with obstruction of the movement of particles and cement mortar [42][45][48][49][50][51][52].
Incorporating glass waste into concrete reduces compressive strength. The researchers ascribed this behavior to (i) the sharp edges and smooth particle surfaces, leading to a poorer bond between cement mortar and glass particles at the interfacial transition zone (ITZ) [22][24][25][32][45][46][64][65][66][67]; (ii) increased water content of the glass aggregate mixes due to the weak ability of WG to absorb water [25][68]; and (iii) the cracks caused by expanding stress formed by the alkali-silica reaction produced from the silica in WG [22].
In order to better understand the impact of glass waste on the properties of the waste-glass concrete [69][70][71][72]. Omoding, Cunningham and Lane-Serff [73] investigated the concrete microstructure via SEM by replacing between 12.5–100% of the coarse aggregate with green waste glass with a size of 10–20 mm. The authors stated (i) that there is a weak connection between the waste glass and the cement matrix. This is because of a reduction in bonding strength between the waste glass and the cement paste because of the high smoothness of waste glass, consequently resulting in cracks and poor adherence between waste glass and cement paste; and (ii) as the content of waste glass increases, the proportion of cracks and voids increases in the concrete’s matrix.
However, some studies have stated that waste glass increases mechanical strength. This increase is primarily realized because of the surface texture and strength of the waste glass particles compared to natural sand [74][75][76] and the pozzolanic reaction of waste glass aggregate [77][78][79].
Refs. | Type of Composite | Source | Type of Sub. | WG Sub. Ratio% | WG Size (mm) | w/c or w/b | Addit. or Admix. | Split ten. str. of Control (MPa) | Outcomes |
---|---|---|---|---|---|---|---|---|---|
[80] | UHPC | WG | F.A | 25, 50, 75, & 100 (wt.%) | ≤0.6 | 0.19 | Steel fiber & HRWRA | 11.7 | Increased by 1%, 3%, 11%, and 7%, respectively. |
[81] | Waste glass concrete | WG | F.A | 15 & 30 (vol.%) | ≤4.75 | 0.5 | - | 4.5 | Changed by +4%, and −1%, respectively. |
[60] | Waste glass concrete | WG | F.A | 5, 15, & 20 (vol.%) | 0.15–4.75 | 0.55 | - | 2.5 | Increased by 4%, 12%, and 24%, respectively. |
[32] | SCC | WG | F.A | 10, 20, 30, 40, & 50 (vol.%) | 0.075–5 | 0.4 | SF & SP | 6.8 | Decreased by 9%, 15%, 16%, 24%, and 28%, respectively. |
[82] | Cement concrete | WG | F.A | 5, 10, 15, & 20 (vol.%) | 0.15–9.5 | 0.56 | - | 3.9 | Decreased by 0%, 8%, 15%, and 23%, respectively. |
[83] | Waste glass concrete | WG | F.A | 10, 20, 30, & 40 (wt.%) | ≤4.75 | 0.45 | - | 2.5 | Decreased by 2%, 8%, 10%, and 12%, respectively. |
[84] | LCDGC | LCD | F.A | 20, 40, 60, & 80 (vol.%) | ≤4.75 | 0.38, 0.44, & 0.55 | - | 2.38 | Decreased by 1%, 7%, 8%, and 9%, respectively, for w/c of 0.44. |
[63] | Waste glass concrete | CRT | F.A | 20, 40, 60, 80, & 100 (vol.%) | 4.75 | 0.45 | F.A. | 4.48 | Decreased by 6%, 6%, 13%, 15%, and 19%, respectively. |
[85] | Waste glass concrete | WG | F.A | 25, 50., 75, & 100 (wt.%) | ≤5 | 0.5 | - | 3.6 | Decreased by 22%, 39%, 39%, and 44%, respectively. |