An investigation on the use of superplasticizer in palm kernel shell aggregate concrete

Okafor, FO

doi:10.1016/0008-8846(91)90105-q

Cited by 20 publications

(5 citation statements)

References 4 publications

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“…As for the NWC, similar values for slump changes, with a similar mix design from this study was shown by Paktiawal and Alam [24] who used SP dosages from 0.15 -0.55%. Similar trends have also been observed for Dura OPSC by Okafor [7], Mannan and Ganapathy [25], and Alengaram et al, [26]. Also, the effect of using OPS as coarse or fine sized does not results in different slump effects as was concluded by Alengaram, et al, [27].…”

Section: Influence On Workability With Constant W/csupporting

confidence: 82%

“…Numerous investigations have been conducted on the use of oil palm shell (OPS) waste as a coarse aggregate in concrete over the past four decades [6]. However, no research has examined the impact of superplasticizers (SPs) on oil palm shell concrete (OPSC) using Tenera OPS, with the exception of a study conducted by Okafor [7], which employed Dura OPS as coarse aggregate and a second-generation SP made of sulphonated naphthalene formaldehyde. The third generation polycarboxylate SP is the most widely used type of SP in the industry, known for its greater efficiency and lower cost than the first-and second-generation SPs [8].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Superplasticizer Dosage on the Workability and Compressive Strength of Tenera Oil Palm Shell Concrete

Mohammed Fadhil Hama,

Mohammed Parvez Anwar,

Lau Teck Leong

et al. 2023

ARASET

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This paper investigates the effects of superplasticizers (SP) on Tenera oil palm shell concrete (Tenera OSPC) in comparison to normal weight concrete (NWC) with similar strengths. Two types of Tenera OSPCs were examined: one with coarse-sized aggregates (coarse OPSC) and the other with fine-sized aggregates (fine OPSC). Two methods were employed in this study: in the first method, SP was added while maintaining a constant water-to-cement (w/c) ratio, and in the second method, the water content was reduced by adding SP while keeping the slump similar to the original mix without SP. The results of the first method indicate that a maximum SP dosage of 0.3% is optimal for both types of Tenera OSPC, although it is recommended to use a lower dosage for fine OPSC to prevent segregation. For the second method, it was found that SP dosages of ≤1% are not as effective as observed for NWC when the w/c ratio is reduced, indicating that higher dosages are required. The study identified that SP does not function as intended with Tenera OSPC most probably due to the chemical processes involved.

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Section: Influence On Workability With Constant W/csupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Influence of Superplasticizer Dosage on the Workability and Compressive Strength of Tenera Oil Palm Shell Concrete

Mohammed Fadhil Hama,

Mohammed Parvez Anwar,

Lau Teck Leong

et al. 2023

ARASET

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“…PKS is approximately 60% lighter than traditional coarse aggregates, based on these density ranges. The shell's densities fall within the range of most common lightweight aggregates [47]. Mannan et al [48] found that adopting pre-treatment procedures such as 20% poly vinyl alcohol as a PVA solution improves the quality of PKS.…”

Section: Palm Kernel Shell -Propertiesmentioning

confidence: 96%

Prospects of Metakaolin Admixed Palm Kernel Shell Solid Concrete Masonry Block: A Review

John¹,

Shanthi²,

Tensing³

2022

cea

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“…Both these options will require increased material and energy inputs into the agricultural system which in turn, can result in the generation of large amounts of wastes and underused by-products (Padam et al 2014). Therefore, the recycling of waste particularly agricultural waste is essential as it can not only help overcome issues of waste generation but resource preservation as well (Okafor 1991) However, the two studies that have mentioned this indicator have only prescribed it (See Table 5).…”

Section: Biodiversity and Materials And Energymentioning

confidence: 99%

The Sustainability Assessment of Plantation Agriculture - A Systematic Review of Sustainability Indicators

Nadaraja

Islam

2021

Sustainable Production and Consumption

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The unsustainable growth of the plantation agricultural sector has caused numerous sustainability challenges including environmental, economic, social and governance concerns. Although a wide variety of sustainability indicators have been developed to monitor and assess the sustainability issues for agriculture in general, few, if any have been developed specifically for plantation agriculture. In response to this, we conducted a systematic review of the literature in order to identify the most commonly used or suggested indicators of sustainability in plantation agriculture and to identify the critical issues in the development of a comprehensive and unambiguous set of sustainability indicators for plantation agriculture. We used the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) method in our systematic review. Following the screening of a large number of articles identified through database searches, 40 articles were finally selected and analysed in this study. The results of the analysis (i.e. indicators) were organized according to the sustainability indicator framework developed by the United Nations Commissions on Sustainable Development (UNCSD). A total of 47 commonly used or suggested indicators relevant for assessing the sustainability of plantation agricultural systems, along with the potential issues in their application were identified. Although it was possible to identify relevant indicators, it was difficult to conclusively identify a universal set of indicators to assess the sustainability of different plantation agricultural systems. We conclude that although 2 developing a suite of sustainability indicators that cover the environmental, social, economic and governance dimensions can add value to agricultural plantations, there is a need to develop sustainability indicators via a bottom up and participatory approach to select a suite of sustainability indicators for plantation agriculture that are not only relevant but can be acceptable to a wide range of stakeholder groups.

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An investigation on the use of superplasticizer in palm kernel shell aggregate concrete

Cited by 20 publications

References 4 publications

Influence of Superplasticizer Dosage on the Workability and Compressive Strength of Tenera Oil Palm Shell Concrete

Influence of Superplasticizer Dosage on the Workability and Compressive Strength of Tenera Oil Palm Shell Concrete

Prospects of Metakaolin Admixed Palm Kernel Shell Solid Concrete Masonry Block: A Review

The Sustainability Assessment of Plantation Agriculture - A Systematic Review of Sustainability Indicators

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