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Design Example: Managing Concrete Workability

Design Example: Managing Concrete Workability

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.

Moisture Content and Bulking of Aggregate

Moisture Content and Bulking of Aggregate

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...

Dynamic Modulus of Elasticity of Concrete

Dynamic Modulus of Elasticity of Concrete

The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...

Retarders

Retarders

Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...

Hot Weather Concreting

Hot Weather Concreting

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.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...

Bonding and Strength of Aggregate

Bonding and Strength of Aggregate

The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...

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Related Experiment Video

Updated: Mar 29, 2026

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight

Published on: May 31, 2022

Determining Optimal Dosage of High-Modulus Asphalt Binders Through Comprehensive Rheological Assessment Across Full

Yijun Wang¹, Bolan Ye², Qisheng Wang³

¹Henan Jiaotou Engineering Management Consulting Co., Ltd., Zhengzhou 450006, China.

Materials (Basel, Switzerland)

|March 28, 2026

Summary

This summary is machine-generated.

This study introduces a framework to evaluate high-modulus asphalt binders, recommending a 22% additive dosage for balanced performance. The research highlights trade-offs across temperatures, crucial for optimizing pavement engineering.

Keywords:

dosage optimization full-temperature-range evaluation high-modulus asphalt rheological assessment

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Last Updated: Mar 29, 2026

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Published on: July 3, 2020

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Published on: January 6, 2023

Area of Science:

Materials Science
Civil Engineering
Pavement Engineering

Background:

High-modulus asphalt binders enhance rutting resistance and reduce pavement thickness.
Conventional indices inadequately assess high-modulus binder performance under stress.
Limited quantitative guidance exists for selecting high-modulus additive dosages.

Purpose of the Study:

Develop a comprehensive framework for evaluating high-modulus additive-modified asphalt binders (HMABs) across all temperatures.
Establish a reliable method for determining optimal additive dosages.
Investigate the full-temperature performance trade-offs associated with HMABs.

Main Methods:

Prepared HMABs with varying dosages (0%, 17%, 22%, 28%) of a high-modulus additive on an SBS-modified base binder.
Evaluated high-temperature performance using PG grading and an enhanced Multiple Stress Creep Recovery (MSCR) protocol (0.1-12.8 kPa).
Assessed intermediate-temperature fatigue using the Linear Amplitude Sweep (LAS) test with VECD analysis.
Determined low-temperature cracking resistance via the Asphalt Bond Strength (ABCD) test.

Main Results:

PG grading showed limited dosage discrimination; enhanced MSCR revealed clearer differences under higher stresses.
Non-recoverable compliance decreased with dosage, and stress sensitivity generally reduced.
LAS tests indicated peak fatigue life at 22% dosage, with a decline at 28%.
ABCD results showed increased critical cracking temperature and reduced fracture stress at higher dosages, indicating higher low-temperature fracture risk.

Conclusions:

High-modulus additives significantly improve high-temperature stability but introduce full-temperature performance trade-offs.
The proposed framework effectively discriminates performance and aids dosage selection.
A 22% additive dosage is recommended for balanced performance, with 17-22% as a controllable engineering range.