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Manufacture of Concrete Masonry Units

Manufacture of Concrete Masonry Units

The process of manufacturing concrete masonry units begins by mixing stiff concrete composed of Portland cement, aggregates, and water. This mixture is then poured into metal molds. To ensure the concrete settles uniformly and to avoid separation of its components, the mixture in the molds is subjected to vibration. Shortly after, the still-wet blocks are removed from the molds and placed on racks.
These wet blocks are then transported for curing, which can occur in one of two environments: a...

Hydration of Cement

Hydration of Cement

Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...

Strength of Cement

Strength of Cement

Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...

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...

Porosity in Cement Paste

Porosity in Cement Paste

The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
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Ferrocement

Ferrocement

Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...

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Related Experiment Video

Updated: Jul 4, 2026

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

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

Published on: June 27, 2018

Special Issue: Multifunctional Cementitious Composites: Manufacturing and Characterization.

Hongzhi Zhang¹

¹School of Qilu Transportation, Shandong University, Jinan 250002, China.

Materials (Basel, Switzerland)

|May 14, 2025

Summary

This summary is machine-generated.

Multifunctional cementitious composites offer enhanced properties for modern construction. Research focuses on developing advanced materials with tailored functionalities for improved performance and sustainability.

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Area of Science:

Materials Science
Civil Engineering
Construction Technology

Background:

Growing demand for advanced construction materials with enhanced performance.
Interest in cementitious composites due to their versatility and cost-effectiveness.
Need for multifunctional materials that offer properties beyond basic structural integrity.

Discussion:

Exploring novel admixtures and additives to impart specific functionalities.
Investigating the synergistic effects of combining different functional components.
Analyzing the impact of material composition on mechanical, durability, and functional properties.

Key Insights:

Development of cementitious composites with integrated functionalities such as self-healing, sensing, or energy harvesting.
Successful incorporation of nanomaterials and phase-change materials for improved performance.
Demonstration of enhanced durability and extended service life in experimental composites.

Outlook:

Potential for widespread adoption in sustainable and smart infrastructure projects.
Further research into cost-effective production and long-term performance validation.
Exploration of new applications in specialized construction and repair scenarios.