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Pozzolans

Pozzolans

Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...

Fiber Reinforced Concrete

Fiber Reinforced Concrete

Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...

Additives and Fillers in Concrete

Additives and Fillers in Concrete

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...

Accelerators

Accelerators

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...

Types of Cement II

Types of Cement II

Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...

Accelerated Curing of Concrete

Accelerated Curing of Concrete

Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...

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The Effect of Changes in the Separation Process for the Performance of Recycled Cement Powder: A Comparison with a Previous Study for Radioactive Waste Immobilization.

Materials (Basel, Switzerland)·2022

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Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior

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High Performance Concretes with Highly Reactive Rice Husk Ash and Silica Fume.

Andres Salas Montoya¹, Chul-Woo Chung², Ji-Hyun Kim³

¹Civil Engineering Department, Engineering and Architecture Faculty, Universidad Nacional de Colombia, Manizales 170003, Colombia.

Materials (Basel, Switzerland)

|June 10, 2023

Summary

This summary is machine-generated.

Highly reactive rice husk ash (TRHA), derived from agricultural waste, significantly enhances concrete strength and durability. TRHA demonstrates comparable performance to silica fume, offering economic and environmental benefits for high-performance concrete applications.

Keywords:

high-performance concretes rice husk ash silica fume strength characteristics waste materials

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Published on: February 21, 2017

Area of Science:

Materials Science
Civil Engineering
Sustainable Construction

Background:

Researchers have long sought sustainable, high-quality non-crystalline silica sources for high-performance concrete.
Rice husk ash (RHA) is a promising pozzolanic material derived from abundant agricultural waste.
Chemical pre-treatment and controlled combustion enhance RHA's reactivity and amorphous structure.

Purpose of the Study:

To prepare and evaluate a highly reactive rice husk ash (TRHA) as a partial replacement for Portland cement in high-performance concrete.
To compare the performance of TRHA with conventional rice husk ash (RHA) and silica fume (SF).

Main Methods:

Preparation of TRHA through chemical washing and controlled combustion of rice husk.
Incorporation of RHA and TRHA as cement replacements in high-performance concrete mixes.
Evaluation of concrete performance through compressive strength, flexural strength, and chloride ion penetration tests.

Main Results:

TRHA significantly increased concrete compressive strength (over 20%) and flexural strength (46%) compared to control concrete.
TRHA exhibited comparable performance to silica fume in terms of strength and chloride ion penetration.
Synergistic effects were observed with polyethylene-polypropylene fiber reinforcement in TRHA and SF concrete.

Conclusions:

The prepared TRHA is a highly effective pozzolanic material for high-performance concrete.
TRHA offers a sustainable and economically viable alternative to silica fume.
Utilizing agricultural waste like rice husks for concrete production yields significant environmental benefits.