Abstract:This experimental study aimed to develop alkali-activated concretes containing carbonated basic oxygen furnace (BOF) slag aggregates. In the first stage, the impacts of replacing normal aggregates with carbonated BOF slag aggregates in different alkali-activated concretes were determined by assessing mechanical properties (compressive and flexural strengths), morphology, thermogravimetric analyses (TGA), differential thermogravimetry (DTG) and the crystalline phases using X-ray diffraction analysis. Second, th… Show more
“…After reaching 600 °C, both plain and reinforced AASs indicated 60% strength loss. Mastali et al reinforced AASs with different fibers (PVA, polypropylene, cellulose, steel, and basalt) and assessed their resistance to a high temperature (600 °C) for 4 h [32]. Similar to the findings of the present study, the minimum compressive and flexural strength loss (around 75% and 70%, respectively) were reported for the AASs reinforced with steel fibers.…”
Section: High Temperature Resistancesupporting
confidence: 85%
“…Similar to the findings of the present study, the minimum compressive and flexural strength loss (around 75% and 70%, respectively) were reported for the AASs reinforced with steel fibers. The maximum strength loss was found for AASs reinforced with PVA fibers, while basalt fibers resulted lower strength loss than other nonmetallic fibers [32]. This confirms that nonmetallic fibers have different impacts on strength loss at high temperatures, depending on the properties of the matrix and bond at the fiber/matrix ITZ.…”
Section: High Temperature Resistancesupporting
confidence: 58%
“…The carbonation test was performed with three prismatic beams (40 × 40 × 160 mm 3 ) from each mixture, which were exposed to 23 °C, 60% relative humidity, and 5% CO 2 gas for 7 days [32]. Then, the impacts of carbonation were evaluated on flexural and compressive strength.…”
Section: Carbonation Testmentioning
confidence: 99%
“…The maximum increase (20%) and decrease (30%) in flexural strength were reported for St0.5PVA0.5 and Bs0.5PVA0.5, respectively. Mastali et al showed that exposing AASs reinforced with PVA and polypropylene fibers to carbonation reduced compressive and flexural strength, while other fiber types (cellulose, basalt, and steel) increased these types of strength [32].…”
Section: Before Aōermentioning
confidence: 99%
“…To the best of the author's knowledge, although a few studies have reported the durability performance of fiberreinforced AASs [32,33], no extensive experimental study has been conducted on the effects of using different fibers as reinforcement on OAASs' mechanical and durability properties. It is worth stating that there are some investigations regarding development of ultra-high fiber reinforced concrete using reinforcement of one-part alkali activated materials with Polyethylene (PE) and PVA fibers [34][35][36].…”
This paper investigates the effects of reinforcing one-part alkali-activated slag binders (OAASs) with different types of fiber (steel, polyvinyl alcohol [PVA], basalt, and cellulose) and fiber combinations (single and hybrid) on the mechanical and durability properties of OAASs. All OAASs were reinforced by a 1% fiber volume fraction. Compressive and flexural strengths were the mechanical properties, which were addressed. The durability of the reinforced OAASs was examined based on water absorption by immersion and capillary, acid resistance, high temperature resistance, carbonation resistance, and freeze/thaw resistance. The experimental results showed that the fiber type and combination greatly affects the mechanical and durability properties of OAASs. Moreover, the influence of fiber type and combination on high temperature resistance and freeze/thaw resistance is greater than the influence on acid resistance and carbonation resistance.
Graphic AbstractKeywords One-part alkali activated binders · Fiber reinforced mortars · Mechanical and durability properties · Fiber type · Fiber combination * Z. Abdollahnejad
“…After reaching 600 °C, both plain and reinforced AASs indicated 60% strength loss. Mastali et al reinforced AASs with different fibers (PVA, polypropylene, cellulose, steel, and basalt) and assessed their resistance to a high temperature (600 °C) for 4 h [32]. Similar to the findings of the present study, the minimum compressive and flexural strength loss (around 75% and 70%, respectively) were reported for the AASs reinforced with steel fibers.…”
Section: High Temperature Resistancesupporting
confidence: 85%
“…Similar to the findings of the present study, the minimum compressive and flexural strength loss (around 75% and 70%, respectively) were reported for the AASs reinforced with steel fibers. The maximum strength loss was found for AASs reinforced with PVA fibers, while basalt fibers resulted lower strength loss than other nonmetallic fibers [32]. This confirms that nonmetallic fibers have different impacts on strength loss at high temperatures, depending on the properties of the matrix and bond at the fiber/matrix ITZ.…”
Section: High Temperature Resistancesupporting
confidence: 58%
“…The carbonation test was performed with three prismatic beams (40 × 40 × 160 mm 3 ) from each mixture, which were exposed to 23 °C, 60% relative humidity, and 5% CO 2 gas for 7 days [32]. Then, the impacts of carbonation were evaluated on flexural and compressive strength.…”
Section: Carbonation Testmentioning
confidence: 99%
“…The maximum increase (20%) and decrease (30%) in flexural strength were reported for St0.5PVA0.5 and Bs0.5PVA0.5, respectively. Mastali et al showed that exposing AASs reinforced with PVA and polypropylene fibers to carbonation reduced compressive and flexural strength, while other fiber types (cellulose, basalt, and steel) increased these types of strength [32].…”
Section: Before Aōermentioning
confidence: 99%
“…To the best of the author's knowledge, although a few studies have reported the durability performance of fiberreinforced AASs [32,33], no extensive experimental study has been conducted on the effects of using different fibers as reinforcement on OAASs' mechanical and durability properties. It is worth stating that there are some investigations regarding development of ultra-high fiber reinforced concrete using reinforcement of one-part alkali activated materials with Polyethylene (PE) and PVA fibers [34][35][36].…”
This paper investigates the effects of reinforcing one-part alkali-activated slag binders (OAASs) with different types of fiber (steel, polyvinyl alcohol [PVA], basalt, and cellulose) and fiber combinations (single and hybrid) on the mechanical and durability properties of OAASs. All OAASs were reinforced by a 1% fiber volume fraction. Compressive and flexural strengths were the mechanical properties, which were addressed. The durability of the reinforced OAASs was examined based on water absorption by immersion and capillary, acid resistance, high temperature resistance, carbonation resistance, and freeze/thaw resistance. The experimental results showed that the fiber type and combination greatly affects the mechanical and durability properties of OAASs. Moreover, the influence of fiber type and combination on high temperature resistance and freeze/thaw resistance is greater than the influence on acid resistance and carbonation resistance.
Graphic AbstractKeywords One-part alkali activated binders · Fiber reinforced mortars · Mechanical and durability properties · Fiber type · Fiber combination * Z. Abdollahnejad
An experimental study was carried out to evaluate the effect of several fibers on the mechanical properties, drying shrinkage, and microstructural characteristics of alkali‐activated kaolin binders. Four different types of fibers were evaluated in this study: polypropylene (PP) fiber, discontinuous structural synthetic (DSS) fiber, brass‐coated steel (BCS) fiber, and hooked steel (HS) fiber. The fibers were added to the alkali‐activated kaolin at a volume fraction of 0%, 0.5%, 1%, and 1.5%. The experimental results revealed that the compressive strength of alkali‐activated binder increased by about 60% when 1% of PP fiber is added, whereas the addition of HS fiber substantially enhanced the flexural strength (more than 200% when 1.5% fiber volume content is added). BCS and HS fibers were found to more effective compared to PP and DSS fibers in maintaining the binder integrity prior to high temperatures exposure. All fiber‐reinforced alkali‐activated composites yielded lower drying shrinkage (≤450 microstrains), where HS fiber was found to effectively prevent the shrinkage of the binder (≤60 microstrains). The microstructural investigation revealed good interfacial bonding between the alkali‐activated binder and the fibers.
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