Abstract:This work was focused on evaluating the suitability of replacing Portland cement (PC) by 5, 10 and 15 mass % of activated alum sludge waste (AAS) as a pozzolanic material. Exploitation of low-cost nanocomposite for bolstering the physical, mechanical, and stability against firing of PC–AAS-hardened composites was inspected. CuFe2O4 spinel nanoparticle with average particle size (~ 50 nm) was prepared. Inclusion of CuFe2O4 spinel in different PC–AAS-hardened composites bolsters their physicomechanical features … Show more
“…On contrary, the BD values when using 15% RAS (mix D) are lower and/or comparable to a blank. These findings are consistent with the previously mentioned compressive strength data and ascribed to the formation of lower quantities of different hydration products owing to the dilution effect of OPC phases by 15% 34 . Figure 8 Bulk density values of different hardened composites.…”
Section: Resultssupporting
confidence: 93%
“…This enhancement could be correlated to the nano-filling effect and the acceleration effect of NMFs particles for the hydration process via acting as active sites. The net result of the inclusion NMFs parties is the generation of additional quantities of yields like CSHs, CASH, CAHs, CFH, CFSH, and MnCSH that accumulated inside the available pores within the hardened composite matrix giving a more compact and dense structure 34 , 45 , 51 . Besides, the inclusion of 2% of NMFs induces a slight decline in the BD values, due to the agglomeration effect of NMFs particle as mentioned previously 4 .…”
Section: Resultsmentioning
confidence: 99%
“…Recently, nanomaterials are utilized heavily in the construction field where that many researchers reported the affirmative impacts of nanomaterials on the densification performance of hardened cement pastes; as nano SiO 2 , TiO 2 , CNTs, Fe 2 O 3 , ZnO, and Montmorillonite 24 – 31 and spinel nanoparticles (NiFe 2 O 4 , ZnFe 2 O 4 , and Cu Fe 2 O 4 ) on different aspects of neat OPC and blended OPC hardened pastes 32 – 34 .…”
This study focused on investigating the possibility of using different ratios (5, 10, 15 mass%) of recycled alum sludge (RAS) as partial replacement of ordinary Portland cement (OPC), to contribute to solving the problems encountered by cement production as well as stockpiling of large quantities of water-treated sludge waste. MnFe2O4 spinel nanoparticles (NMFs) were used to elaborate the mechanical characteristics and durability of different OPC-RAS blends. The outcomes of compressive strength, bulk density, water absorption, and stability against firing tests fastened the suitability of utilization of RAS waste for replacing OPC (maximum limit 10%). The inclusion of different doses of NMFs nanoparticles (0.5, 1 and 2 mass %) within OPC–RAS pastes, motivates the configuration of hardened nanocomposites with improved physico-mechanical characteristics and stability against firing. Composite made from 90% OPC–10% RAS–0.5% NMFs presented the best characteristics and consider the optimal choice for general construction applications. Thermogravimetric analysis (TGA/DTG), X-ray diffraction analysis (XRD), and scanning electron microscope (SEM) techniques. affirmed the positive impact of NMFs particles, as they demonstrated the formation of enormous phases as ilvaite (CFSH), calcium silicate hydrates (CSHs), MnCSH, Nchwaningite [Mn2 SiO3(OH)2 H2O], [(Mn, Ca) Mn4O9⋅3H2O], calcium aluminosilicate hydrates (CASH), Glaucochroite [(Ca, Mn)2SiO4, and calcium ferrite hydrate (CFH). These hydrates boosted the robustness and degradation resistance of the hardened nanocomposites upon firing.
“…On contrary, the BD values when using 15% RAS (mix D) are lower and/or comparable to a blank. These findings are consistent with the previously mentioned compressive strength data and ascribed to the formation of lower quantities of different hydration products owing to the dilution effect of OPC phases by 15% 34 . Figure 8 Bulk density values of different hardened composites.…”
Section: Resultssupporting
confidence: 93%
“…This enhancement could be correlated to the nano-filling effect and the acceleration effect of NMFs particles for the hydration process via acting as active sites. The net result of the inclusion NMFs parties is the generation of additional quantities of yields like CSHs, CASH, CAHs, CFH, CFSH, and MnCSH that accumulated inside the available pores within the hardened composite matrix giving a more compact and dense structure 34 , 45 , 51 . Besides, the inclusion of 2% of NMFs induces a slight decline in the BD values, due to the agglomeration effect of NMFs particle as mentioned previously 4 .…”
Section: Resultsmentioning
confidence: 99%
“…Recently, nanomaterials are utilized heavily in the construction field where that many researchers reported the affirmative impacts of nanomaterials on the densification performance of hardened cement pastes; as nano SiO 2 , TiO 2 , CNTs, Fe 2 O 3 , ZnO, and Montmorillonite 24 – 31 and spinel nanoparticles (NiFe 2 O 4 , ZnFe 2 O 4 , and Cu Fe 2 O 4 ) on different aspects of neat OPC and blended OPC hardened pastes 32 – 34 .…”
This study focused on investigating the possibility of using different ratios (5, 10, 15 mass%) of recycled alum sludge (RAS) as partial replacement of ordinary Portland cement (OPC), to contribute to solving the problems encountered by cement production as well as stockpiling of large quantities of water-treated sludge waste. MnFe2O4 spinel nanoparticles (NMFs) were used to elaborate the mechanical characteristics and durability of different OPC-RAS blends. The outcomes of compressive strength, bulk density, water absorption, and stability against firing tests fastened the suitability of utilization of RAS waste for replacing OPC (maximum limit 10%). The inclusion of different doses of NMFs nanoparticles (0.5, 1 and 2 mass %) within OPC–RAS pastes, motivates the configuration of hardened nanocomposites with improved physico-mechanical characteristics and stability against firing. Composite made from 90% OPC–10% RAS–0.5% NMFs presented the best characteristics and consider the optimal choice for general construction applications. Thermogravimetric analysis (TGA/DTG), X-ray diffraction analysis (XRD), and scanning electron microscope (SEM) techniques. affirmed the positive impact of NMFs particles, as they demonstrated the formation of enormous phases as ilvaite (CFSH), calcium silicate hydrates (CSHs), MnCSH, Nchwaningite [Mn2 SiO3(OH)2 H2O], [(Mn, Ca) Mn4O9⋅3H2O], calcium aluminosilicate hydrates (CASH), Glaucochroite [(Ca, Mn)2SiO4, and calcium ferrite hydrate (CFH). These hydrates boosted the robustness and degradation resistance of the hardened nanocomposites upon firing.
“…This is since the waste from the AAS gets diluted (Mix A) and this decrease in the CS can be attributed to the dilution effect of PC as a result of its replacement with high percentages of AAS waste, which in turn reduces the amount of Ca(OH) 2 liberated as a secondary hydration product from C 3 S and -C 2 S phases that required activating the AAS waste. In other words, the amount of Ca(OH) 2 liberated as a secondary hydration product from C 3 S and –C 2 S phases 53 .…”
The major objective of this study was to examine the viability of using 5, 10, or 15 mass% of Activated Alum Sludge waste (AAS) instead of Ordinary Portland Cement (OPC) as a pozzolanic ingredient in concrete. This fundamental inquiry framed the investigation and OPC-AAS-hardened composites were studied to see whether they may benefit from inexpensive nanocomposites in terms of improved physical properties, mechanical strength, and resistance to heat and flame. The investigation set out to see how inexpensive nanocomposite might be put to use and the nanoparticles of CuFe2O4 spinel with an average size of less than 50 nm were successfully manufactured. Many different OPC-AAS-hardened composites benefit from the addition of CuFe2O4 spinel, which increases the composites' resistance to fire and enhances their physicomechanical properties at roughly average curing ages. Synthesized CuFe2O4 spinel was shown to have desirable characteristics by TGA/DTG and XRD. By using these methods, we were able to identify a broad variety of hydration yields, including C–S–Hs, C–A–S–Hs, C–F–S–Hs, and Cu–S–Hs, that enhance the physicomechanical properties and thermal resistivity of OPC-AAS-hardened composites as a whole. The composite material comprising 90% OPC, 10% AAS waste, and 2% CuFe2O4 has several positive economic and environmental outcomes.
“…The TS 25 standard suggests that SiO 2 + Al 2 O 3 + Fe 2 O 3 should be at least 70%, that SO 3 should be less than 3.0%, that CI should be less than 0.1%, and that the XRF study of AAS highlights the capacity of employing activated alum sludge waste (AAS) as supplemental cementitious materials (SCM) with qualities equal to those of a typical active pozzolanic material. In addition, the standard suggests the fact that XRF analysis was performed on the AAS brings this point home very clearly 49 . This investigation made use of a superplasticizer (SP) that was a modi ed polycarboxylate-based superplasticizer (PCsp) called Sika Viscocrete 5230 L. It has a speci c gravity of 1.08 g/ml and was supplied by Sika Company in El-Obour City, Egypt.…”
The primary purpose of this investigation was to find out whether it would be feasible to successfully replace Ordinary Portland Cement (OPC) with 5, 10, or 15 mass % of activated alum sludge waste (AAS) as a pozzolanic material. This was the overarching question that guided the research that was conducted. A study into the use of low-cost nanocomposites to increase the physical, mechanical, and stability against the fire of OPC–AAS-hardened composites was carried out. The goal of this inquiry was to explore the utilization of low-cost nanocomposite. Producing CuFe2O4 spinel nanoparticles with an average particle size of less than 50 nm was doable. The introduction of CuFe2O4 spinel into a variety of OPC–AAS-hardened composites improve both the physicomechanical characteristics of the composites at nearly typical curing ages as well as the resistance of the composites to the effects of fire. Techniques such as TGA/DTG and XRD were utilized to provide evidence that synthesized CuFe2O4 spinel had favorable properties. These approaches revealed the presence of a range of hydration yields, such as CSHs, CASHs, CFSHs, and CuSHs, which improve the overall physicomechanical parameters as well as the thermal stability of a wide variety of OPC–AAS-hardened composites. The composite material that is composed of (90 % OPC, 10 % AAS waste, and 2 % CuFe2O4 offer several advantages, both financially and ecologically.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
