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Related Concept Videos

Response Surface Methodology01:16

Response Surface Methodology

95
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:
95
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

74
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.
74
Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

107
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.
One such test is the revolving disc test, where three plates...
107
Factors Affecting Workability01:24

Factors Affecting Workability

67
The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
67
Moisture Content and Bulking of Aggregate01:10

Moisture Content and Bulking of Aggregate

132
The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
132
Mixing Concrete01:30

Mixing Concrete

104
Concrete mixing ensures a homogenous blend where aggregates are well-coated with cement paste. Concrete mixing is typically done using two main types of mixers: batch and continuous. Batch mixers handle one batch at a time, thoroughly combining materials before discharging and receiving the next batch. In contrast, continuous mixers receive a steady flow of ingredients, mixing them consistently and discharging without interruption. Within batch mixers, tilting drum mixers mix with internal...
104

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Related Experiment Video

Updated: Jun 10, 2025

Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall
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Evaluating and optimizing NBR-modified bituminous mixes: a rheological and RSM-based study.

Inamullah Khan1, Zahoor Ahmad Khan2, Muhammad Imran Khan3

  • 1Transportation Engineering Department, National Institute of Transportation, National University of Sciences and Technology, Islamabad, 44000, Pakistan. inamullah.khan@nit.nust.edu.pk.

Scientific Reports
|October 18, 2024
PubMed
Summary
This summary is machine-generated.

Recycled surgical gloves, as Nitrile Butadiene Rubber, enhance asphalt pavement stiffness. Optimal addition of 5.9% Nitrile Butadiene Rubber improves pavement performance by increasing dynamic modulus and reducing phase angle.

Keywords:
Dynamic Modulus |E*|Nitrile Butadiene Rubber (NBR)Phase Angle(δ)Response surface modeling (RSM)Statistical modeling

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Polymer Science

Background:

  • Asphalt pavements degrade due to fatigue cracks, rutting, and temperature-induced deformations.
  • These distresses necessitate frequent maintenance and rehabilitation, increasing infrastructure costs.
  • Developing durable asphalt mixtures is crucial for extending pavement service life.

Purpose of the Study:

  • To investigate the efficacy of Nitrile Butadiene Rubber (NBR) from surgical gloves as an asphalt additive.
  • To evaluate the impact of varying NBR percentages on asphalt pavement's rheological and mechanical properties.
  • To optimize NBR content for improved pavement performance using response surface methodology.

Main Methods:

  • Incorporated NBR (2%, 4%, 6%, 8%) into conventional bituminous pavement mixtures.
  • Assessed rheological properties, Marshall stability, dynamic modulus, and phase angle at diverse temperatures and frequencies.
  • Utilized a simple performance tester and response surface methodology for data analysis and optimization.

Main Results:

  • Marshall stability and dynamic modulus peaked with 6% NBR addition, showing improved performance.
  • NBR addition increased dynamic modulus, particularly at lower temperatures (4.4°C) and higher frequencies.
  • Response surface modeling confirmed the relationship between NBR content, temperature, frequency, and pavement response.

Conclusions:

  • Nitrile Butadiene Rubber effectively enhances asphalt stiffness and performance up to an optimal percentage.
  • The optimal NBR content for maximizing dynamic modulus and minimizing phase angle is approximately 5.9%.
  • This study presents a sustainable approach to asphalt modification using recycled rubber materials.