Concrete Containing Waste Glass as Environmentally Friendly Aggregate: Comparison
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  • waste glass
  • recycling
  • construction materials
  • sustainable concrete

1. Introduction

Glass is one of the world’s most diverse substances because of its substantial properties, such as chemical inertness, optical clarity, low permeability, and high authentic strength [1][2][3]. The usage of glass items has greatly increased, leading to enormous quantities of WG. Globally, it is estimated that 209 million tons of glass are produced annually [4][5][6]. In the U.S., according to the Environmental Protection Agency (EPA) [7][8][9], 12.27 million tons of glass were created in 2018 in municipal solid waste (MSW).
Recycling and reducing waste are key parts of a waste-management system since they contribute to conserving natural resources, reducing requests for waste landfill space, and reducing pollution of water and air [10][11]. According to Meyer [12], by 2030, the EU zero-waste initiative estimates that improvements in resource efficiency throughout the chain could decrease material input requirements by 17% to 24%, satisfying the demand for raw materials between 10% to 40%, and could contribute to reducing emissions by 40% [13][14][15].

2. Properties of Glass

2.1. Chemical Properties of Glass

Glass exists in various colors and types, with various chemical components. Table 1 and Table 2 show the chemical compositions of different colors and types of typical glass, respectively.
Table 1. Chemical components of glass for various colors.
]. In general, the incorporation of WG aggregates into concrete increases the modulus of elasticity [60][84].

5. Conclusions

  • The workability of waste-glass-containing concrete mixtures for fine or coarse aggregates was less than for natural aggregate-containing mixtures. Nevertheless, despite the poorer workability, some studies found that the mixtures were still workable.
  • Most studies indicated that with the introduction of WG, the density of concrete decreased due to the decreased density and specific gravity of waste glass aggregates.
  • The findings of the literature have been somewhat indecisive regarding the properties of concrete, such as compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity.
  • The findings revealed that the compressive strength, splitting tensile strength, and flexural strength of concrete deteriorated by integrating WG. Nevertheless, the findings concerning the elastic modulus of concrete were conflicting. This decrease was essential because of the sharp edges and smooth surface of the waste glass that caused the poorer bond between cement mortar and waste glass particles at the ITZ.
  • Studies also showed that the optimal aggregate substitution level was about 20%. In addition, the glass color does not have a substantial influence on the strength. Although the results are indecisive, WG has the possibility to be an acceptable substitute for fine or coarse concrete aggregates in concrete.
  • Adding waste glass to the concrete mixture may improve certain mechanical characteristics of concrete, reduce concrete dead load, and provide an ecological substitute for normal aggregates.
Color Chemical Compositions Refs.
SiO2 CaO Na2O Al2O3 MgO Fe2O3 K2O SO3 TiO2 Cr2O3 Others
Table 4, respectively.
Table 3. Physical properties of crushed WG.
Property Refs.
White 70.39 6.43
Specific gravity
Property Refs.
16.66 2.41 2.59 0.32 0.23 0.19 2.4–2.80.08 -

0.04 (MnO), 0.02 (Cl) 2.51 (Green), 2.52 (Brown) [22][16]
Clear 72.42 11.50 13.64
Fineness Modulus24
CBR (California bearing ratio) (%) Approx. 50–75.
4.25]
[28] 1.44

0.44–3.29		 [23
Los Angeles Value (%)0.32 38.4] [25][0.07 [0.35 0.21 270.035 0.002 ]- [17]
Flint 70.65 Bulk Density 1360 kg/m10.70 3 [25][26]13.25 1.75 2.45 0.45 0.55 0.45 - - - [18]
24.8–27.8AmberShape Index (%) 30.5
[26] 70.01 10.00 15.35 3.20 1.46 - 0.82 0.06 F.A0.11 - 10, 20, 30, 40, & 50 (vol.%)0.04 (MnO) 0.075–5 0.4 SF & SP 6.8 Decreased by 9%, 15%, 16%, 24%, and 28%, respectively.[16]
Brown 71.19 10.38 13.16 2.38 1.70 0.29 0.70 0.04 0.15 - -
[[19]
Flakiness Index 8284.3–94.7 ][27] 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. Green 72.05 10.26 14.31 2.81 0.90 - 0.52 0.07 0.11 - 0.04 (MnO) [16]
Table 2. Chemical components of glass for various types. Adapted from [20][21].
[
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.
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
  16 7   6 10 4  
Fiberglass 64.5   0.5 24.5 10.5          
Borosilicate Chemical apparatus
Table 4. Mechanical properties of crushed WG.
27.7
[29]
Friction Angle critical = 38 (Loose recycled glass) [28]
critical = 51–61 (Dense recycled glass)
Combustion tubes
62
 
1
17
7     8 5  
Resistor substrates 57  
81   4 2         13  
Tungsten sealing 74   4 1         15  
Pharmaceutical 72 1 7 6         11

2.2. Physical and Mechanical Properties of Glass

The physical and mechanical properties of crushed WG are listed in Table 3 and 

3. Fresh Concrete Properties

3.1. Workability

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].

3.2. Bulk Density

Past studies on the impact of WG aggregates on the bulk density, which are summarized in Figure 1, revealed that the majority of studies showed that incorporating glass waste into mixtures reduces density. This decrease can be ascribed to the lesser density of WG compared to natural aggregate [24][42][43][44], as well as the lower specific gravity [25][43][45][46][47]. 

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]. 

On the other hand, Liu, Wei, Zou, Zhou and Jian [33] stated that concrete of 10 to 50% WG had a fresh density greater than reference. The authors substitute F.A in UHPC mixes with recycling CRT glass at levels of 25% to 100% by volume. They stated that the fresh density of waste-glass concrete mixtures increased by 1% 2.5%, 3.5%, and 6%, incorporating 25%, 50%, 75%, and 100% of WG, respectively. The authors attributed the reason to the fact that the density of CRT glass (2916 kg/m3) was larger than that of fine aggregate (2574 kg/m3) [53][54][55][56][57].
/media/item_content/202209/6327ca6b979f7materials-15-06222-g002.png
Figure 1. Bulk density of concrete with various content of WG. Adapted from references [33][42][46][58][59][60][61][62][63].

4. Mechanical Properties

4.1. Compressive Strength

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].

4.2. Splitting Tensile Strength

Past studies on the impact of WG aggregates on the splitting tensile strength of waste-glass concrete, which are summarized in Table 7, revealed that incorporating glass waste into concrete reduces tensile strength. Similarly, as in compressive strength, studies have attributed the main reason for this behavior to the poor bond between cement paste and glass particles at the ITZ. 
Table 5. Summary of the results of past studies on the splitting tensile strength of waste-glass concrete.
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
Where: UHPC is ultra-high-performance concrete; LCDGC is liquid crystal display glass concrete; LCD is liquid crystal display; CRT is cathode ray tube; WG is waste glass; SP is superplasticizer; HRWRA is a high-range water-reducing agent; SF is silica fume; F.A. is fly ash; F.A is fine aggregate; C.A is coarse aggregate; vol. is replacing by volume; wt. is replacing by weight.

4.3. Flexural Strength

The flexural strength of waste-glass concrete shows comparable tendencies to its compressive strength and tensile strength. Most of the research revealed that introducing WG aggregates reduced flexural strength. However, other research showed that flexural strength increased when WG was included [86][87][88].

4.4. Modulus of Elasticity (MOE)

The modulus of elasticity of concrete (MOE) depends on the normal and lightweight aggregates elasticity modulus, cement matrix, and their relative ratios in the mixes [21

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