Class: Senior Secondary School 1 (SS 1)
Term: 3rd Term
Week: 1
Age: 15 years
Duration: 45 minutes
Subject: Block Laying, Brick Laying and Concrete Work
Curriculum Theme: Entrepreneurship (Trade Subjects)
Previous Lesson: .
Topic: PROPERTIES OF CONCRETE
Subject Matter: properties of concrete, strength of concrete, durability of concrete, applications of concrete

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define concrete.
List at least three important properties of concrete.
Explain what is meant by the strength of concrete.
State at least two applications of concrete in construction.

Affective Domain:

Appreciate the importance of understanding concrete properties in construction.
Participate actively in class discussions about concrete applications.

Psychomotor Domain:

Identify the basic components used in making concrete.
Distinguish between different concrete properties based on observable characteristics.

Collaborate with peers to discuss the various uses of concrete in their community.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Basic Technology (JSS 1-3) and Trade Subjects (SS 1-3)
State Unified Scheme of Work for Senior Secondary Schools.
Building Construction for Senior Secondary Schools by J.O. Popoola.

Instructional Materials

The teacher will teach this lesson with the aid of:

Samples of cement, sand, gravel (aggregates).
A sample of hardened concrete.
Charts showing different concrete structures.

Rationale for the Lesson

This lesson helps pupils understand the fundamental characteristics and uses of concrete, a common material in construction. Knowing about concrete’s properties enables pupils to appreciate its role in building structures and its practical applications in daily life and future careers.

Prerequisite/Previous Knowledge

Pupils should have basic knowledge of different building materials and their general uses in construction.

Lesson Content/Board Summary

PROPERTIES OF CONCRETE

Definition of Concrete

Concrete is a composite construction material composed mainly of cement, aggregates (sand and gravel), and water. These ingredients are mixed together and allowed to harden over time.

Properties of Concrete

The following are important properties of concrete:

Compressive Strength: The ability of concrete to resist crushing forces.
Durability: The ability of concrete to resist weathering action, chemical attack, and abrasion.
Workability: The ease with which concrete can be mixed, transported, placed, and compacted without segregation.
Water Tightness: The ability of concrete to prevent the passage of water through it.
Fire Resistance: The ability of concrete to withstand high temperatures without significant loss of strength or integrity.

Strength of Concrete

The strength of concrete is primarily its resistance to compression. It is measured in megapascals (MPa) or pounds per square inch (psi). Factors affecting concrete strength include:

Water-cement ratio.
Type and quality of cement.
Type and grading of aggregates.
Degree of compaction.
Curing conditions and time.

Durability of Concrete

Durability refers to concrete’s ability to maintain its original properties and performance over time when exposed to various environmental conditions. Factors influencing concrete durability include:

Exposure to freeze-thaw cycles.
Chemical attacks (e.g., sulfates, acids).
Abrasion and erosion.
Permeability (how easily fluids can pass through).
Cracking.

Applications of Concrete

The following are common applications of concrete:

Foundations for buildings.
Floors, slabs, and roofs.
Walls and columns.
Roads, pavements, and bridges.
Dams and retaining walls.
Drainage systems and pipes.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils, reviews the previous lesson briefly, and then introduces the new topic, “Properties of Concrete,” by asking pupils to mention common building materials they know.
Pupils’ Activity: Pupils respond to greetings, recall the previous lesson, and mention building materials such as sand, cement, wood, and concrete.
Learning Point: Pupils are reminded of previous knowledge and are prepared for the new topic.

Step 2: Definition of Concrete

Time: 7 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines concrete as a mixture of cement, aggregates, and water, explaining how it hardens to form a strong material. The teacher also shows samples of cement and aggregates.
Pupils’ Activity: Pupils listen attentively, observe the samples, and take notes on the definition of concrete.
Learning Point: Pupils understand the basic composition and definition of concrete.

Step 3: Properties of Concrete

Time: 10 minutes
Teaching Skill: Explanation/Listing
Teacher’s Activity: The teacher explains various properties of concrete such as compressive strength, durability, workability, and water tightness, using simple language and practical examples.
Pupils’ Activity: Pupils listen, ask questions for clarification, and note down the properties of concrete.
Learning Point: Pupils identify and understand key properties that make concrete useful.

Step 4: Strength and Durability of Concrete

Time: 8 minutes
Teaching Skill: Elaboration/Discussion
Teacher’s Activity: The teacher further explains the concepts of concrete strength and durability, discussing factors that affect each. The teacher encourages pupils to think about why these properties are important in construction.
Pupils’ Activity: Pupils engage in discussion, contributing ideas on the importance of strength and durability, and asking questions about the influencing factors.
Learning Point: Pupils grasp the significance of strength and durability in concrete performance and construction safety.

Step 5: Applications of Concrete

Time: 5 minutes
Teaching Skill: Enumeration/Brainstorming
Teacher’s Activity: The teacher lists various applications of concrete in daily life and construction, such as foundations, roads, and bridges. The teacher also asks pupils to mention other places they see concrete being used.
Pupils’ Activity: Pupils listen, identify the listed applications, and mention other uses of concrete they observe in their environment.
Learning Point: Pupils recognize the widespread use of concrete in various structures.

Step 6: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define concrete.
Mention three important properties of concrete.
What is meant by the strength of concrete?
List two applications of concrete in construction.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 7: Conclusion

Time: 5 minutes
Teaching Skill: Summarization/Assignment
Teacher’s Activity: The teacher summarizes the main points of the lesson, emphasizing the importance of concrete’s properties and uses. The teacher then assigns homework: “Research and write down two advantages and two disadvantages of using concrete as a building material.”
Pupils’ Activity: Pupils listen to the summary and note down the homework assignment.
Learning Point: Pupils consolidate their understanding and are given a task to deepen their knowledge.

Lesson Keywords

Concrete – A building material made from cement, aggregates, and water.
Strength – The ability of concrete to resist crushing or breaking forces.
Durability – The ability of concrete to resist wear, weather, and chemical attack.
Aggregates – Materials like sand and gravel used in concrete mixture.
Workability – The ease with which concrete can be handled and compacted.

Differentiation

For pupils who grasp concepts quickly, the teacher can encourage them to research different types of concrete (e.g., reinforced concrete, pre-stressed concrete). For pupils requiring more support, the teacher can provide simplified notes or pair them with higher-achieving pupils for peer learning during discussions.

Note for teachers using this lesson plan

Ensure that actual samples of concrete materials (cement, sand, gravel, and a hardened concrete block) are available for pupils to observe and touch. This practical exposure enhances understanding. Encourage pupils to share examples of concrete structures from their local environment.