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Related Concept Videos

Response Surface Methodology01:16

Response Surface Methodology

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Response Surface Methodology (RSM) is a collection of statistical and mathematical techniques used to develop, improve, and optimize processes. It is particularly valuable when many input variables or factors potentially influence a response variable.
The process of RSM involves several key steps:
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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

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This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

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Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
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Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

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Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
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Hot Weather Concreting01:20

Hot Weather Concreting

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Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
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Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

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The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
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Optimizing coconut fiber-modified hot mix asphalt for enhanced mechanical performance using response surface

Nasir Khan1, Muslich Hartadi Sutanto2, Inamullah Khan3

  • 1Department of Civil & Environmental Engineering, Universiti Teknologi PETRONAS (UTP), 32610, Seri Iskandar, Malaysia. nasir_22012207@utp.edu.my.

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This study optimizes coconut fiber use in hot mix asphalt (HMA), reducing waste and enhancing pavement performance. Optimized HMA with coconut fibers shows improved mechanical properties, promoting sustainable road construction.

Keywords:
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Area of Science:

  • Materials Science
  • Civil Engineering
  • Environmental Science

Background:

  • Coconut production generates significant fiber waste, contributing to environmental pollution.
  • Coconut fibers possess excellent physical and mechanical properties, yet their potential in construction materials is underutilized.
  • Limited research exists on incorporating coconut fibers into hot mix asphalt (HMA) as a sustainable alternative.

Purpose of the Study:

  • To evaluate the feasibility of using coconut fibers in HMA to reduce waste and improve mechanical performance.
  • To optimize the mix design of fiber-modified HMA using response surface methodology (RSM).
  • To assess the mechanical properties of optimized coconut fiber-HMA mixes.

Main Methods:

  • Central composite design (CCD) and response surface methodology (RSM) were employed for mix design optimization.
  • Marshall testing was used to determine optimal fiber content, bitumen content, and fiber length.
  • Mechanical properties including indirect tensile strength, tensile strength ratio, and indirect tensile stiffness modulus (ITSM) were evaluated.

Main Results:

  • The optimized HMA mix contained 0.28% coconut fibers (13 mm length) and 4.16% bitumen, achieving a marshall stability of 18.02 kN and flow of 3.12 mm.
  • Optimized mixes showed a 5% increase in indirect tensile strength compared to control samples.
  • Optimized HMA exhibited higher ITSM at 15°C, 20°C, and 25°C compared to control mixes, though fatigue performance was slightly lower.

Conclusions:

  • RSM effectively optimizes Marshall mix design for fiber-modified HMA, reducing laboratory testing.
  • Incorporating coconut fibers into HMA offers a sustainable solution for waste valorization and enhanced pavement properties.
  • Optimized coconut fiber-HMA demonstrates potential for sustainable and efficient asphalt technologies.