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Related Concept Videos

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

76
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.
76
Hot Weather Concreting01:20

Hot Weather Concreting

58
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,...
58
Factors Affecting Workability01:24

Factors Affecting Workability

68
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...
68
Retarders01:19

Retarders

67
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...
67
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

92
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...
92
Accelerators01:17

Accelerators

71
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
71
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  11. Comprehensive Rheological And Mechanistic Evaluation Of An Asphalt Binder And Mixture Modified With Warm Mix Additives

Comprehensive rheological and mechanistic evaluation of an asphalt binder and mixture modified with warm mix additives

Dheeraj Adwani1, Praveen Kumar2, Ankit Sharma3

  • 1Department of Civil, Architectural, and Environmental Engineering, The University of Texas at Austin, Austin, TX, USA. dheerajadwani@utexas.edu.

Environmental Science and Pollution Research International
|August 9, 2024

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Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
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View abstract on PubMed

Summary
This summary is machine-generated.

Warm mix asphalt (WMA) additives Sasobit®, Evotherm®, and Zycotherm® show promise for Indian road construction. These additives improve binder performance and asphalt mixture durability, paving the way for wider WMA adoption.

Area of Science:

  • Pavement Engineering
  • Materials Science

Background:

  • Warm mix asphalt (WMA) technology adoption is limited in India despite its long introduction.
  • Building confidence in local binders is crucial for widespread WMA use in road construction.

Purpose of the Study:

  • To evaluate the impact of three common WMA additives (Sasobit®, Evotherm®, Zycotherm®) on VG-30 binder properties and asphalt mixture performance in India.
  • To establish suitable dosages for WMA additives based on binder testing for subsequent mixture evaluations.

Main Methods:

  • Dynamic mechanical analysis of ten binder combinations (VG-30 with three dosages of each additive).
  • Binder evaluations included Superpave grading, frequency sweep, multiple stress creep recovery, and linear amplitude sweep tests.
  • Mixture testing involved Marshall stability, flow, and modified Lottman tests for moisture susceptibility.
Keywords:
Indirect tensile strengthLinear amplitude sweepMoisture susceptibilityMultiple stress creep and recovery

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Main Results:

  • Sasobit® improved high-temperature binder characteristics; Evotherm® enhanced fatigue performance; Zycotherm® showed minimal binder property changes.
  • All three WMA additives demonstrated satisfactory performance in Marshall stability and flow tests.
  • WMA additives improved moisture susceptibility, with Zycotherm® exhibiting the best results.

Conclusions:

  • The study indicates that Sasobit®, Evotherm®, and Zycotherm® have promising effects on binder and mixture performance.
  • These WMA additives show potential for successful application in real-world road construction scenarios in India.
Superpave parameters
Warm mix additives
Zero shear viscosity