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Related Concept Videos

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.
One such test is the revolving disc test, where three plates...
476
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.
275
Moisture Content and Bulking of Aggregate01:10

Moisture Content and Bulking of Aggregate

404
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...
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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.
The...
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Mixing Time01:19

Mixing Time

429
The concept of mixing time is significant in producing a uniform concrete mix with the required strength. The mixing period starts once all components are in the mixer. Initially, the mixer is charged with 10% of the water, followed by the consistent addition of solids and then 80% of the water. The remaining water is added later, within the first quarter of the mixing period. The minimum mixing time varies according to the mixer's capacity; for example, mixers with up to 1 cubic yard...
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Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

284
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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Statistical optimization of crumb rubber modified bitumen performance through material blending analysis.

Naeem Aziz Memon1, Ahmed Suliman B Ali2,3, Nur Izzi Md Yusoff4

  • 1Faculty of Civil Engineering, Universiti Teknologi MARA, Shah Alam, 40450, Selangor, Malaysia.

Scientific Reports
|December 10, 2025
PubMed
Summary

Optimizing crumb rubber modified bitumen (CRMB) involves controlling blending parameters and material selection. Ideal conditions enhance CRMB performance for sustainable road construction.

Keywords:
Asphalt rubberBitumenBlending, SARA, storage stabilityCRMBCrumb rubber, CR

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Chemical Engineering

Background:

  • Crumb rubber modified bitumen (CRMB) offers enhanced pavement performance.
  • Optimizing CRMB requires understanding blending parameters and material properties.

Purpose of the Study:

  • To comprehensively investigate and optimize the performance of CRMB.
  • To analyze the effects of blending parameters and material characteristics on CRMB properties.

Main Methods:

  • Systematic evaluation of blending temperature, mixing speed, time, and mixer type.
  • Assessment of bitumen grade, crumb rubber type, mesh size, and content.
  • Chemical interaction analysis using SARA fractions and statistical methods (factorial design, ANOVA).

Main Results:

  • Optimized blending at 180°C for 90 min with high shear mixing (2000-3000 rpm) yielded stable CRMB.
  • Significant improvements in viscosity, penetration, and softening point were observed.
  • Aromatic content inversely correlated with viscosity (r = -0.78); resins and asphaltenes increased stiffness.

Conclusions:

  • Performance optimization necessitates controlled blending conditions and informed material selection.
  • Developed regression models achieved strong predictive power (R² = 0.85).
  • This dual approach supports scalable, efficient, and sustainable CRMB production.