Composition of Concrete

What percentage of the total composition of concrete is made up of aggregates by weight?

What is the primary function of cement in concrete composition?

At what temperature does the point of incipient fusion occur during the cement production process?

Which material is primarily responsible for creating Portland Cement after being burned?

What is formed when the burnt product of Portland Cement is mixed with Gypsum?

Which of the following is true of hydraulic cement?

Who is credited with the invention of modern Portland cement?

What is the heat generated from the reaction between cement and water called?

What is the primary component that fills the voids in fine aggregates according to the composition of concrete?

Why was Portland Cement named so?

Composition of Concrete

Composed of three main components: 14% Cement, 80% Aggregates, and 6% Water by weight.
Aggregate classification: Coarse Aggregates account for 50% while Fine Aggregates consist of 30%.
By volume distribution: 10% Cement, 70% Aggregates, 15% Water, and 5% Air.

Functions of Cement

Binds Coarse Aggregates (CA) and Fine Aggregates (FA) to form a durable mass.
Fills voids between CA and FA for compactness and stability.

Portland Cement

Made by calcining a mixture of argillaceous and calcareous materials at approximately 1480°C, resulting in a product known as clinker.
Clinker is combined with Gypsum and pulverized to create Portland Cement.
Named after Portland stone, which resembles the cement, and patented by Joseph Aspdin in 1824; modern formulations credited to his son William Aspdin in the 1840s.

Hydraulic Cement

Reacts chemically with water through a process called Hydration.
Hardens even when submerged underwater, demonstrating resistance to water effects.
Gains strength continuously in the presence of moisture.

Heat of Hydration

Refers to the heat generated during the chemical reaction between cement and water.
The heat produced varies based on the cement's chemical composition and factors such as fineness, chemical structure, and temperature during hydration.

This quiz explores the composition of concrete, including the roles and proportions of its key components: cement, aggregates, and water. Understand the classifications of these materials and their functions in creating a solid structure. Test your knowledge on the active and inactive groups within concrete's make-up.