CELE Construction Management & Methods — Construction Materials and TestingConcept Map

Concept

Concrete

Sub Concepts

• Water-Cement Ratio (w/c)
• Slump Test (Workability)
• Compressive Strength Testing
• Tensile Strength (Split-Cylinder)
• Flexural Strength (Modulus of Rupture)
• Air Content Testing

Relationship To Central

Primary material requiring comprehensive testing and quality control

Concept

Aggregates

Sub Concepts

• Fine Aggregate Grading
• Coarse Aggregate Grading
• Fineness Modulus
• Specific Gravity
• Absorption
• Unit Weight
• Cleanliness Testing

Relationship To Central

Key constituent materials affecting concrete quality and workability

Concept

Steel Reinforcement

Sub Concepts

• Yield Strength Testing
• Ultimate Strength Testing
• Elongation (Ductility)
• Bend Test
• Mill Certificates
• Sample Tension Tests

Relationship To Central

Structural material requiring strength and ductility verification

Concept

Statistical Quality Control and Acceptance

Sub Concepts

• Average Strength (f'cr)
• Standard Deviation (s)
• ACI Required Average Formula
• Two-Formula Approach
• Statistical Sampling
• Acceptance Criteria

Relationship To Central

Framework for verifying material compliance and establishing required average strength

Concept

Testing Standards and Procedures

Sub Concepts

• Standard Cylinder Dimensions
• Standard Cube Dimensions
• Age of Testing (28 days)
• Loading Rate
• Curing Conditions
• Philippine Standards (NSCP 2015)
• ACI 318 Compliance

Relationship To Central

Standardized methods ensuring consistent and reliable material evaluation

To

Compressive Strength Testing

From

Water-Cement Ratio (w/c)

Strength

strong

Relationship

w/c is the primary design variable controlling the strength outcome measured in compressive testing; lower w/c yields higher strength

To

Water-Cement Ratio (w/c)

From

Slump Test

Strength

strong

Relationship

Slump (workability) is inversely affected by w/c; lower w/c reduces slump but increases strength

To

Statistical Quality Control and Acceptance

From

Compressive Strength Testing

Strength

strong

Relationship

Individual cylinder test results feed into average and standard deviation calculations for ACI acceptance formulas

To

Concrete

From

Aggregates

Strength

strong

Relationship

Aggregate gradation and cleanliness directly influence concrete workability, strength development, and paste demand

To

Required Average Strength (f'cr)

From

Standard Deviation (s)

Strength

strong

Relationship

Standard deviation is the critical input to ACI formulas for determining the required average strength; higher s requires higher f'cr

To

Concrete Workability

From

Fineness Modulus

Strength

moderate

Relationship

Well-graded aggregate (appropriate FM) reduces paste demand and improves workability

To

Structural Performance

From

Steel Reinforcement

Strength

strong

Relationship

Steel yield and ultimate strength values establish reinforcement capacity; elongation and bend tests verify ductility for safe design

To

Flexural Strength (Modulus of Rupture)

From

Tensile Strength (Split-Cylinder)

Strength

moderate

Relationship

Both measure tensile capacity of concrete by different methods; split-cylinder is more practical for QC; MOR used for pavement design

To

All Material Testing

From

Testing Standards and Procedures

Strength

strong

Relationship

Standardized methods (NSCP 2015, ACI 318) ensure consistent, reproducible results across all material testing

To

Concrete Durability

From

Air Content Testing

Strength

moderate

Relationship

Adequate entrained air improves freeze-thaw and salt-spray durability; air content must be within specified limits

To

Concrete Mix Design

From

Specific Gravity (Aggregate)

Strength

moderate

Relationship

Specific gravity is used to convert aggregate proportions from mass to volume and to calculate unit weight of concrete

To

Water-Cement Ratio Calculation

From

Absorption (Aggregate)

Strength

moderate

Relationship

High-absorption aggregate requires correction to effective water content in mix design and w/c calculations

To

Field Quality Assurance

From

Compressive Strength Testing

Strength

strong

Relationship

Job cylinders provide the primary evidence for concrete acceptance and payment; test results drive warranty and corrective action decisions

To

Conservative Design

From

Two-Formula ACI Approach

Strength

strong

Relationship

The maximum of two formulas ensures adequate statistical safety margin; the governing formula depends on variability (standard deviation)

To

Steel Quality Control

From

Mill Certificates

Strength

moderate

Relationship

Mill certificates document yield and ultimate strength; sample tension tests from the job batch verify compliance with certificates