Effective use of micro-silica extracted from rice husk ash for the production of high-performance and sustainable cement mortar

Khan, Kaffayatullah; Ullah, Muhammad Fahad; Shahzada, Khan; Amin, Muhammad; Bibi, Tayyaba; Wahab, Nauman; Aljaafari, Abdullah

doi:10.1016/j.conbuildmat.2020.119589

Cited by 43 publications

(16 citation statements)

References 72 publications

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“…However, high substitution-rate composite cement mortar with RHA and BOFs showed an adverse performance in terms of water absorption with a replacement of more than 60% by the weight of the binder [38]. The mortars containing extracted micro-silica (EMS) from RHA at a replacement percentage with cement of 5% and 15% were found to have a lower porosity by 6.3% and 5.1%, respectively, at 14 days, while they were 5.4% and 3.1% lower than that of the control mortars, respectively, at 28 days [78].…”

Section: Water Absorptionmentioning

confidence: 99%

“…Agro-waste can accelerate C-S-H formation through an effective pozzolanic reaction. Furthermore, the extracted micro-silica (EMS) from RHA as a substituent of cement, by 5% and 15%, was shown to improve the high-density C-S-H phases, resulting in incremental improvements in compressive strength and ultimately a high-performance sustainable cement mortar [78]. The EMS with a replacement percentage of 5% and 15% improved the compressive strength of the mortars by 64.2% and 51.6%, respectively, and further increased the flexural strength by 46.8%, and 24%, respectively.…”

Section: The Effect Of Agro-wastes On Strengthmentioning

confidence: 99%

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The Utilization of Agricultural Waste as Agro-Cement in Concrete: A Review

Kawasaki

Achal

2020

Sustainability

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Concrete, as the world’s most implemented construction material, is increasingly being used because of the rapid development of industrialization and urbanization. Limited resources and progressive depravation of the environment are forcing scientific efforts to seek alternative and effective materials from large amounts of natural resources as additives in the partial replacement of cement. Cement is a main constituent of concrete. To solve and minimize environmental issues, research works attempting to employ the wide availability of agricultural wastes, such as sugar cane bagasse, rice husk, sugar cane straw, and palm oil fuel, among others, into cement, and to finally bring sustainable and environmentally friendly properties to concrete are being examined. Agro-waste materials are crushed into fine and coarse aggregates or are burnt into ash, and are then mixed with cement, which is known as agro-cement. The replacement of aggregates, either partially or fully, is also deemed as a sustainable material in construction. This paper mainly reviews the current research on agro-cement that has been researched and applied for the enhancement of the strength and durability of concrete. It further summarizes the relevant knowledge and techniques, while providing optimal parameters for applying agricultural wastes in concrete.

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Section: Water Absorptionmentioning

confidence: 99%

Section: The Effect Of Agro-wastes On Strengthmentioning

confidence: 99%

The Utilization of Agricultural Waste as Agro-Cement in Concrete: A Review

Kawasaki

Achal

2020

Sustainability

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“…It should be noted that the use of thick RCA (up to 30%) is usually recommended, but it is often considered necessary to add superplasticizers [ 48 ] to achieve the required workability of the new concrete. These materials can improve the durability of concrete [ 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ]. Due to the scarce works found in the literature, further research efforts are needed to determine the effect of the RCA as well as the partial substitution of OPC with SCBA in the corrosion performance of these novel concretes [ 55 , 56 , 57 ].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Steel-Reinforced Green Concrete Containing Recycled Coarse Aggregate Additions in Sulfate Media

et al. 2020

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Novel green concrete (GC) admixtures containing 50% and 100% recycled coarse aggregate (RCA) were manufactured according to the ACI 211.1 standard. The GC samples were reinforced with AISI 1080 carbon steel and AISI 304 stainless steel. Concrete samples were exposed to 3.5 wt.% Na2SO4 and control (DI-water) solutions. Electrochemical testing was assessed by corrosion potential (Ecorr) according to the ASTM C-876-15 standard and a linear polarization resistance (LPR) technique following ASTM G59-14. The compressive strength of the fully substituted GC decreased 51.5% compared to the control sample. Improved corrosion behavior was found for the specimens reinforced with AISI 304 SS; the corrosion current density (icorr) values of the fully substituted GC were found to be 0.01894 µA/cm2 after Day 364, a value associated with negligible corrosion. The 50% RCA specimen shows good corrosion behavior as well as a reduction in environmental impact. Although having lower mechanical properties, a less dense concrete matrix and high permeability, RCA green concrete presents an improved corrosion behavior thus being a promising approach to the higher pollutant conventional aggregates.

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“…In contrast, the lower CS of hollow block produced with 40% laterite and 15% calcite implies excessive silica in the cementitious matrix resulting in lower CS. Recent studies reported that excessive silica content (laterite) contributes to CS reduction [ 80 , 81 ].…”

Section: Resultsmentioning

confidence: 99%

Ternary and quaternary blends as partial replacement of cement to produce hollow sandcrete blocks

Sojobi

Awolusi

Aina

et al. 2021

Heliyon

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Hollow sandcrete blocks constitute more than 90% of residential building construction in developing countries especially in West Africa. Over-reliance on dredged river sands and conventional ordinary Portland cement (OPC) contributes to environmental degradation and post-construction problems such as swelling and shrinkage-induced cracks prevalent in construction projects. The study investigates potential utilization of locally available materials such as laterite, calcite and calcined clay as ternary and quaternary blends to replace cement and quarry dust as 100% replacement of river sand with the aid of Taguchi-Response surface methodology approach. Optimum ternary blend of 24% calcined clay +1% calcite +75% OPC is recommended to achieve volume stability, higher compressive strength and higher flexural load capacity. Alternatively, ternary blends of 24% calcite +4% calcined clay +72% OPC can also be utilized. The improved mechanical properties were attributed to the Na- and Ca-rich aluminosilicates provided by the blended cements. Successful utilization of ternary and quaternary blended cements to produce stronger, durable and eco-friendly sandcrete blocks depends on utilization of high binder-to-aggregate ratio, optimal combination of the constituents, appropriate water-cement ratio and curing/production method. Partial and 100% replacement of river sand with granite dust is possible and contributes to reduction of environmental problems caused by river dredging as well as cleaner, ecofriendly construction. Ternary and quaternary blended cements is recommended to avert post-construction problems such as swelling and shrinkage-induced cracks prevalent in construction projects.

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Effective use of micro-silica extracted from rice husk ash for the production of high-performance and sustainable cement mortar

Cited by 43 publications

References 72 publications

The Utilization of Agricultural Waste as Agro-Cement in Concrete: A Review

The Utilization of Agricultural Waste as Agro-Cement in Concrete: A Review

Corrosion Behavior of Steel-Reinforced Green Concrete Containing Recycled Coarse Aggregate Additions in Sulfate Media

Ternary and quaternary blends as partial replacement of cement to produce hollow sandcrete blocks

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