Improvement in compressive strength of Styrene-Butadiene-Rubber (SBR) modified mortars by using powder form and nanoparticles

Idrees, Maria; Saeed, Farhan; Amin, Abreeza; Hussain, Tousif

doi:10.1016/j.jobe.2021.102651

Cited by 21 publications

(16 citation statements)

References 24 publications

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“…Figure 4 shows that the compressive strengths of concrete increased with an increase in SBR percentage. Similar results were obtained for mortar in a recent study by the authors [ 25 ].…”

Section: Resultssupporting

confidence: 91%

“…Hence, the effect of SBR is dissimilar to the properties of concrete depending on solid particle sizes. Idrees et al described the phenomenon of increased compressive strength of SBR-powder-modified mortar, contrary to the decreased compressive strength of SBR-latex-modified mortar after 5% of cement replacement [ 25 ]. Moreover, SBR powder can also be used as an additive in producing pre-packaged cement mixes and preparing specific performance ready-made concrete mixes.…”

Section: Methodsmentioning

confidence: 99%

“…The mix proportions of concrete for compressive strength, flexural strength, and rapid chloride permeability test samples are given in Table 3 . Cement is replaced by styrene-butadiene-rubber (SBR) by up to 10% by weight because this was found to be an optimum value for replacement [ 25 ]. Higher loading of SBR may not be economical and feasible, so SBR is limited to 10% replacement considering the economy, feasibility, and previous work.…”

Section: Methodsmentioning

confidence: 99%

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Improvement in Durability and Mechanical Performance of Concrete Exposed to Aggressive Environments by Using Polymer

et al. 2022

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Concrete is the most widely used construction material. However, it cannot sustain the harsh environment and can easily deteriorate. It results in repair and reworks that amount to a considerable loss of money and time. The life span of concrete reduces if exposed to external attacks, for instance, sulfate attacks, alkali-silica reactions, corrosion, and drying shrinkage. These ubiquitous attacks cause a reduction in service life and raise the need for early repair and maintenance, resulting in higher life cycle costs and structural failures. To resolve these issues, the potential of styrene-butadiene-rubber (SBR) ultrafine powder as cement replacement polymeric admixture at 0%, 3%, 5%, 7%, and 10% have been evaluated. The effect of SBR-powder on concrete is investigated by conducting an alkali-silica reactivity test (ASR), rapid-chloride-permeability test (RCPT), drying shrinkage, and sulfate resistivity tests. Workability, compressive and flexural strength tests are also conducted. For ASR and drying shrinkage, mortar bar samples were cast, exposed to respective environments, and the percentage change in length was measured. For mechanical tests and RCPT, prisms, cylinders and cubes were cast and tested at 28 days. The SBR-powder modification reduces concrete’s permeability, drying shrinkage, and expansions due to ASR and sulfate attacks. SBR powder increased workability by 90%, compressive strength by 23%, and flexural strength by 9.4% in concrete when used at 10% cement replacement by weight. The SBR-powder (10%) modification reduced the RCPT value by up to one-third (67%), drying shrinkage by 53%, ASR by 57%, and sulfate reaction by 73%. Consequently, SBR powder usage can adequately improve the workability, mechanical properties, and durability of the concrete and lead to advanced sustainable concrete with low repair requirements.

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“…Figure 4 shows that the compressive strengths of concrete increased with an increase in SBR percentage. Similar results were obtained for mortar in a recent study by the authors [ 25 ].…”

Section: Resultssupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Improvement in Durability and Mechanical Performance of Concrete Exposed to Aggressive Environments by Using Polymer

et al. 2022

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“…The rapid chloride permeability test (RCPT) is a good indicator of permeability (interconnectivity of pores in concrete causing water and ions to ingress and attack). Higher permeability means more durability issues [ 37 , 38 ]. Higher values of RCPT provide higher chances of steel corrosion in concrete.…”

Section: Methodsmentioning

confidence: 99%

Recycling of Waste Facial Masks as a Construction Material, a Step towards Sustainability

et al. 2022

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Amid the COVID-19 pandemic, a sudden surge in the production and utilization of disposable, single-use facial masks has been observed. Delinquency in proposal disposal of used facial masks endangers the environment with a new form of non-biodegradable plastic waste that will take hundreds of years to break down. Therefore, there is an urgent need for the resourceful recycling of such waste in an environmentally friendly way. This study presents an efficient solution by using waste masks in fibered or crushed form to produce environmentally friendly and affordable green concrete. This investigation assessed the mechanical and durability properties of waste masks-incorporated concrete. A total of six mixes were prepared for standardized tests to determine compressive strength, split cylinder tensile strength and rapid chloride penetration test (RCPT), and freeze-thaw resistance. The percentage of mask fibers used were 0.5, 1, 1.5, and 2% of concrete by volume, while crushed masks were used at 0.5% only. The mask waste in both forms was found suitable to be used in concrete. One percent of waste mask fibers was found as an optimum value to increase compressive and tensile strength, reduce chloride permeability, and increase freeze-thaw resistance. Besides this, 0.5% crushed mask fiber also performed well, especially for producing less permeable and highly durable concrete. It is thus corroborated that waste masks that increase pollution worldwide can be utilized sustainably to help build green buildings. By reutilizing waste masks to produce improved concrete with better strengths and higher durability, circular economy and sustainability are achieved, along with efficient waste management.

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“…The permeability of concrete is a critical property that controls other durability issues [ 44 ]. Higher permeability relates to lower durability, high corrosion potential, and other durability issues.…”

Section: Resultsmentioning

confidence: 99%

Effect of Silicon Carbide and Tungsten Carbide on Concrete Composite

et al. 2022

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Flexural strength of concrete is an important property, especially for pavements. Concrete with higher flexural strength has fewer cracking and durability issues. Researchers use different materials, including fibers, polymers, and admixtures, to increase the flexural strength of concrete. silicon carbide and tungsten carbide are some of the hardest materials on earth. In this research, the mechanical properties of carbide concrete composites were investigated. The silicon carbide and tungsten carbide at different percentages (1%, 2%, 3%, and 4%) by weight of cement along with hybrid silicon carbide and tungsten carbide (2% and 4%) were used to produce eleven mixes of concrete composites. The mechanical tests, including a compressive strength test and flexural strength test, along with the rapid chloride permeability test (RCPT), were conducted. It was concluded that mechanical properties were enhanced by increasing the percentages of both individual and hybrid carbides. The compressive strength was increased by 17% using 4% tungsten carbide, while flexural strength was increased by 39% at 4% tungsten carbide. The significant effect of carbides on flexural strength was also corroborated by ANOVA analysis. The improvement in flexural strength makes both carbides desirable for use in concrete pavement. Additionally, the permeability, the leading cause of durability issues, was reduced considerably by using tungsten carbide. It was concluded that both carbides provide promising results by enhancing the mechanical properties of concrete and are compatible with concrete to produce composites.

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Improvement in compressive strength of Styrene-Butadiene-Rubber (SBR) modified mortars by using powder form and nanoparticles

Cited by 21 publications

References 24 publications

Improvement in Durability and Mechanical Performance of Concrete Exposed to Aggressive Environments by Using Polymer

Improvement in Durability and Mechanical Performance of Concrete Exposed to Aggressive Environments by Using Polymer

Recycling of Waste Facial Masks as a Construction Material, a Step towards Sustainability

Effect of Silicon Carbide and Tungsten Carbide on Concrete Composite

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