CELE Construction Management & Methods — Construction Methods, Equipment and OperationsConcept Map

Concept

Equipment Productivity

Sub Concepts

• Capacity per Cycle
• Cycles per Hour
• Efficiency Factor
• Bucket Fill Factor
• Output Formula

Relationship To Central

Core foundation for calculating work output and efficiency

Concept

Fleet Matching and Optimization

Sub Concepts

• Truck Cycle Time
• Load Time
• Haul Time
• Dump Time
• Return Time
• Number of Trucks Formula

Relationship To Central

Critical for balancing trucks and loaders to minimize idle time and cost

Concept

Earthmoving Operations

Sub Concepts

• Excavators
• Loaders
• Dozers
• Scrapers
• Haul Trucks
• Swell Factor
• Shrinkage Factor
• Bank Volume
• Loose Volume
• Compacted Volume

Relationship To Central

Primary construction method involving soil movement and placement

Concept

Concrete Operations

Sub Concepts

• Batching
• Mixing and Transport
• Placing and Consolidation
• Vibration
• Curing
• Formwork Design
• Falsework
• Fresh Concrete Pressure

Relationship To Central

Major construction method for structural and architectural elements

Concept

Working Time and Efficiency

Sub Concepts

• Working Minutes per Hour
• Job Conditions
• Management Efficiency
• Weather Delays
• Material Delays

Relationship To Central

Modifying factor affecting all productivity calculations

To

Cycles per Hour

From

Equipment Productivity

Strength

strong

Relationship

Direct inverse relationship; cycle time (seconds) determines cycles per hour via 3600/t formula

To

Efficiency Factor

From

Equipment Productivity

Strength

strong

Relationship

Multiplier applied to theoretical output to reflect real-world working time and job conditions

To

Working Time and Efficiency

From

Efficiency Factor

Strength

strong

Relationship

Working minutes per hour and job conditions directly determine the efficiency multiplier (e.g., 50/60 = 0.833)

To

Truck Cycle Time

From

Fleet Matching and Optimization

Strength

strong

Relationship

Numerator in the fleet matching formula N = Cycle Time / Load Time

To

Equipment Productivity

From

Fleet Matching and Optimization

Strength

strong

Relationship

Fleet size must match loader output to prevent idle time or queuing; both use same efficiency concepts

To

Equipment Productivity

From

Earthmoving Operations

Strength

strong

Relationship

Excavators, loaders, dozers, and haul trucks each have specific productivity formulas applied to earthwork projects

To

Swell Factor

From

Earthmoving Operations

Strength

strong

Relationship

Swell increases loose volume beyond bank volume; directly affects truck capacity and haul distance calculations

To

Shrinkage Factor

From

Earthmoving Operations

Strength

strong

Relationship

Shrinkage reduces compacted volume below bank volume; determines bank volume needed for fill specifications

To

Bank Volume

From

Swell Factor

Strength

strong

Relationship

Starting point for calculating loose volume; Vloose = Vbank × (1 + Swell)

To

Compacted Volume

From

Shrinkage Factor

Strength

strong

Relationship

Ending point for fill placement; Vbank = Vcompacted / (1 - Shrinkage)

To

Fresh Concrete Pressure

From

Concrete Operations

Strength

strong

Relationship

Formwork and falsework must be designed to resist the hydrostatic and dynamic pressure of fresh concrete

To

Formwork Design

From

Concrete Operations

Strength

strong

Relationship

Formwork system is critical for concrete placement success; design must account for pressure, bracing, and reuse

To

Bucket Fill Factor

From

Equipment Productivity

Strength

moderate

Relationship

Multiplier for excavators and loaders accounting for partial filling or material rebound; typically 0.8 to 1.0

To

Earthmoving Operations

From

Fleet Matching and Optimization

Strength

moderate

Relationship

Fleet matching is essential to optimize truck-loader systems in earthwork projects

To

Earthmoving Operations

From

Working Time and Efficiency

Strength

moderate

Relationship

Weather, material delays, and management conditions affect all earthmoving equipment output

To

Concrete Operations

From

Working Time and Efficiency

Strength

moderate

Relationship

Concrete operations are sensitive to weather (curing temperature, premature drying) and schedule delays

To

Bucket Fill Factor

From

Capacity per Cycle

Strength

strong

Relationship

Bucket capacity is multiplied by fill factor to get realistic capacity per cycle

To

Equipment Productivity

From

Load Time

Strength

moderate

Relationship

Loader's load time per truck cycle determines how many cycles per hour the loader can complete

To

Truck Cycle Time

From

Haul Time

Strength

strong

Relationship

One component of total truck cycle; depends on haul distance and road conditions

To

Truck Cycle Time

From

Dump Time

Strength

strong

Relationship

One component of total truck cycle; time to discharge load at destination

To

Truck Cycle Time

From

Return Time

Strength

strong

Relationship

One component of total truck cycle; empty return from dump site to loader

To

Concrete Operations

From

Consolidation

Strength

strong

Relationship

Vibration removes air voids and ensures concrete quality; critical phase in placement process

To

Concrete Operations

From

Curing

Strength

strong

Relationship

Post-placement process to maintain temperature and moisture for strength gain; affects schedule and quality

To

Concrete Operations

From

Batching

Strength

strong

Relationship

First phase; precise measurement and mixing of materials to achieve specified concrete properties

To

Concrete Operations

From

Mixing and Transport

Strength

strong

Relationship

Middle phase; concrete transported within slump-loss limits (typically 90 minutes for ready-mix)

To

Concrete Operations

From

Placing and Consolidation

Strength

strong

Relationship

Critical phase where concrete is poured and compacted into formwork; quality depends on method and timing

To

Formwork Design

From

Falsework

Strength

strong

Relationship

Temporary support system for formwork; must be engineered to resist all loads and prevent failure