Introduction to Engineering Materials

Flashcards covering key concepts in the lecture on Engineering Materials.

What are the Program Educational Objectives (PEO) of the Civil Engineering program?

The PEOs include demonstrating knowledge and skills in Civil Engineering, working in teams, considering ethical and environmental implications, and engaging in lifelong learning.

What does the Outcome-Based Education (OBE) system allow students to do?

It allows students from accredited programs to study or work in signatory countries without having to pass competitive or equivalence examinations.

List the key attributes that graduates of the Civil Engineering Department will demonstrate.

Engineering Knowledge, Problem Analysis, Design/Development of Solutions, Investigation, Modern Tool Usage, The Engineer and Society, Environment and Sustainability, Ethics, Individual and Team Work, Communication, Project Management, Lifelong Learning.

What is the primary function of engineering materials in construction?

To withstand applied loads without breaking and without exhibiting excessive deflection.

What are the two main components of concrete?

Paste (Portland cement, water, and air) and aggregate (sand, gravel, crushed stone).

What percentage of total volume of concrete do aggregates make up?

Aggregates make up 60-75% of the total volume of concrete.

Define natural aggregates.

Natural aggregates are extracted from larger rock formations, forming part of a larger parent mass.

What is manufactured aggregate?

Manufactured aggregate is often a byproduct of other manufacturing industries, such as slag from the steel-making process.

What defines recycled concrete aggregates?

Recycled concrete aggregates are derived from waste concrete obtained from demolition of concrete buildings and other structures.

What effect do coarse aggregates have on concrete?

Coarse aggregates significantly affect strength, stability, and deformation properties.

What is the relationship between water absorption and aggregate quality?

Water absorption affects the amount of water and mortar required, impacting the strength and workability of the concrete.

What is the significance of particle shape in aggregates?

The shape determines how well the material packs into a dense configuration, influencing the concrete's strength.

What is the Los Angeles abrasion test used for?

To measure the toughness and abrasion resistance of aggregates.

What is the fineness modulus?

An index used to estimate the degree of coarseness of aggregates, helpful in estimating proportions in concrete mixtures.

What impact do void contents have on mortar requirements in mix design?

Void contents affect the water and mortar requirements; higher void content leads to increased needs.

What are the defining characteristics of coarse aggregates?

Coarse aggregates are retained on a 4.75mm (#4) sieve and have particle sizes greater than 4.75 mm.

How does the performance of lightweight aggregates compare to normal aggregates in terms of fire resistance?

Lightweight aggregates generally have better fire resistance due to their insulation properties.

What is the importance of aggregate soundness?

Soundness indicates the aggregate's ability to withstand weathering, crucial for structures exposed to severe climatic conditions.

What is meant by 'void content' in aggregates?

Void content refers to the empty spaces between aggregate particles, affecting concrete mix requirements.

What type of aggregates are not suitable for high-strength concrete?

Flaky and elongated aggregates are not suitable due to poor interlocking behavior and weak bond strength.