[Audio] QA/QC -203
Statistical Quality Control Part 1
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QA/QC -203
Unit 11:
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Statistical Quality Control Part 1
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[Audio] U-11Statistical Quality Control Part 1
Objectives  Understand the concept of statistical quality control  Identify the types of statistical quality control  Understanding and Applying Quality Control Methods ( Flow Chart , Check List , Cause and Effects Diagram , Acceptance Sampling ) in Construction .. 

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Objectives
U-11Statistical Quality Control Part 1
 Understand the concept of statistical quality control
 Identify the types of statistical quality control
 Understanding and Applying Quality Control Methods ( Flow Chart , Check List , Cause and Effects
Diagram , Acceptance Sampling ) in Construction .

[Audio] U-11Statistical Quality Control Part 1
Definition and Importance of S-Q-C in Construction Statistical Quality Control (S-Q-C--) is a methodology that applies statistical methods to monitor and control the quality of processes in construction projects. It ensures that construction processes meet predetermined quality standards by identifying variations in construction processes and materials early, thus reducing errors, defects, and rework. S-Q-C is critical in construction because it provides a data-driven approach to quality management, enabling decision-makers to monitor project performance quantitatively, predict potential issues, and take corrective action before defects occur.. 

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•
Statistical Quality Control (SQC) is a methodology that applies statistical methods to monitor and
control the quality of processes in construction projects. It ensures that construction processes meet pre-
determined quality standards by identifying variations in construction processes and materials early, thus
reducing errors, defects, and rework.
•
SQC is critical in construction because it provides a data-driven approach to quality management,
enabling decision-makers to monitor project performance quantitatively, predict potential issues, and take
corrective action before defects occur.
U-11Statistical Quality Control Part 1
Definition and Importance of SQC in Construction

[Audio] U-11Statistical Quality Control Part 1
Key Elements of S-Q-C in Construction Variation and its Sources: Variations in materials, workmanship, environmental conditions, and equipment can all lead to quality issues. Control Limits and Specifications: Define acceptable ranges for performance parameters such as concrete strength, steel elasticity, or surface flatness in road construction. Continuous Monitoring: Ongoing inspections and statistical testing help keep the project within defined quality limits.. 

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U-11Statistical Quality Control Part 1
Key Elements of SQC in Construction
•
Variation and its Sources: Variations in materials, workmanship, environmental conditions, and
equipment can all lead to quality issues.
•
Control Limits and Specifications: Define acceptable ranges for performance parameters such as
concrete strength, steel elasticity, or surface flatness in road construction.
•
Continuous Monitoring: Ongoing inspections and statistical testing help keep the project within
defined quality limits.

[Audio] U-11Statistical Quality Control Part 1
Types of Statistical Quality Control  Descriptive Statistics in Construction Descriptive statistics summarize large sets of data, such as averages (mean), standard deviation, and range. For instance, monitoring concrete strength samples over a week and calculating their mean and standard deviation helps in understanding material consistency.
 Statistical Process Control (S-P-C--)
S-P-C tools such as control charts and run charts help monitor process performance over time. This ensures that the construction process remains within control limits. A common example is using S-P-C to monitor the curing time and compressive strength of concrete over time.. 

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 Descriptive Statistics in Construction
Descriptive statistics summarize large sets of data, such as averages (mean), standard deviation, and
range. For instance, monitoring concrete strength samples over a week and calculating their mean and
standard deviation helps in understanding material consistency.
 Statistical Process Control (SPC)
SPC tools such as control charts and run charts help monitor process performance over time. This ensures
that the construction process remains within control limits. A common example is using SPC to monitor the
curing time and compressive strength of concrete over time.
U-11Statistical Quality Control Part 1
Types of Statistical Quality Control

[Audio] U-11Statistical Quality Control Part 1
Developing Statistical Quality Control Plans  Steps to Implementing an S-Q-C Plan Define Quality Standards: Set standards for each construction phase (for example, acceptable tolerances for concrete strength, steel reinforcement positioning). Identify Critical Control Points: Identify areas most susceptible to defects (for example, concrete mixing, steel welding). Establish Control Procedures: Create a procedure for regular sampling, testing, and control charting.. 

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 Steps to Implementing an SQC Plan
• Define Quality Standards: Set standards for each construction phase (e.g., acceptable tolerances for
concrete strength, steel reinforcement positioning).
• Identify Critical Control Points: Identify areas most susceptible to defects (e.g., concrete mixing, steel
welding).
• Establish Control Procedures: Create a procedure for regular sampling, testing, and control charting.
Developing Statistical Quality Control Plans
U-11Statistical Quality Control Part 1

[Audio] U-11Statistical Quality Control Part 1
Types of Statistical Quality Control  Acceptance sampling in Construction Acceptance sampling involves testing a subset of materials (like steel bars or asphalt) and making decisions about accepting or rejecting the entire batch based on the sample results. This reduces the need for 100% testing, making QC more efficient.. 

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 Acceptance sampling in Construction
Acceptance sampling involves testing a subset of materials (like steel bars or asphalt) and making decisions about
accepting or rejecting the entire batch based on the sample results. This reduces the need for 100% testing, making
QC more efficient.
U-11Statistical Quality Control Part 1
Types of Statistical Quality Control

[Audio] U-11Statistical Quality Control Part 1
Statistical Quality Control in Construction  Methods of Statistical Quality Control (S-Q-C--) in Construction Statistical Quality Control (S-Q-C--) utilizes various statistical methods to measure, monitor, and control the quality of processes in construction projects. These methods ensure that construction practices meet desired standards and that variations in processes are detected and corrected early to minimize defects. Below, we explore the major S-Q-C methods used in construction projects:. 

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 Methods of Statistical Quality Control (SQC) in Construction
Statistical Quality Control (SQC) utilizes various statistical methods to measure, monitor, and control the quality of
processes in construction projects. These methods ensure that construction practices meet desired standards and
that variations in processes are detected and corrected early to minimize defects. Below, we explore the major SQC
methods used in construction projects:
Statistical Quality Control in Construction
U-11Statistical Quality Control Part 1

[Audio] U-11Statistical Quality Control Part 1
Flow Charts in Quality Control A flow chart is a graphical representation of a process or system, illustrating the sequence of steps required to complete a task. In construction quality control, flow charts help visualize the workflow for completing tasks, ensuring all steps are followed in a logical, consistent manner.
Application in Construction Projects: Process Mapping: Flow charts help map the workflow for construction tasks such as concrete pouring, formwork inspection, or equipment installation. By showing the sequence of operations, they ensure that all necessary steps are followed.. 

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•
A flow chart is a graphical representation of a process or system, illustrating the sequence of steps
required to complete a task. In construction quality control, flow charts help visualize the workflow for
completing tasks, ensuring all steps are followed in a logical, consistent manner.
Application in Construction Projects:
•Process Mapping: Flow charts help map the workflow for construction tasks such as concrete pouring,
formwork inspection, or equipment installation. By showing the sequence of operations, they ensure that
all necessary steps are followed.
Flow Charts in Quality Control
U-11Statistical Quality Control Part 1

[Audio] U-11Statistical Quality Control Part 1
Flow Charts in Quality Control Quality Assurance Procedures: Flow charts can be used to visualize how a quality assurance process works, ensuring that materials and workmanship meet specified standards. Problem Identification: Flow charts are useful for tracing the root cause of a quality issue by visualizing where a deviation from standard procedures might have occurred.. 

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•Quality Assurance Procedures: Flow charts can be used to visualize how a quality assurance process
works, ensuring that materials and workmanship meet specified standards.
•Problem Identification: Flow charts are useful for tracing the root cause of a quality issue by visualizing
where a deviation from standard procedures might have occurred.
U-11Statistical Quality Control Part 1
Flow Charts in Quality Control

[Audio] U-11Statistical Quality Control Part 1
Components of a Flow Chart Start/End (Terminator): Represents the beginning or end of a process. Process (Task): A box that shows a specific task or activity that needs to be performed. Decision: A diamond shape representing a point where a decision must be made (for example, "Is the material acceptable?"). Flow Line: Arrows that show the direction of the workflow. Input/Output: Parallelogram shapes that indicate material inputs or process outputs.. 

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• Start/End (Terminator): Represents the beginning or end of a process.
• Process (Task): A box that shows a specific task or activity that needs to be performed.
• Decision: A diamond shape representing a point where a decision must be made (e.g., “Is the material
acceptable?”).
• Flow Line: Arrows that show the direction of the workflow.
• Input/Output: Parallelogram shapes that indicate material inputs or process outputs.
Components of a Flow Chart
U-11Statistical Quality Control Part 1

[Audio] U-11Statistical Quality Control Part 1
Benefits of Flow Charts: Clarity: Provides a clear, visual roadmap for completing tasks, helping to avoid confusion or missed steps. Process Optimization: Identifies inefficiencies or bottlenecks in the workflow, enabling teams to optimize the process. Standardization: Ensures that every team follows the same process, maintaining consistency across different projects or phases. Training Tool: Flow charts serve as a training tool for new employees, helping them understand each step of the quality control process.. 

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• Clarity: Provides a clear, visual roadmap for completing tasks, helping to avoid confusion or missed
steps.
• Process Optimization: Identifies inefficiencies or bottlenecks in the workflow, enabling teams to
optimize the process.
• Standardization: Ensures that every team follows the same process, maintaining consistency across
different projects or phases.
• Training Tool: Flow charts serve as a training tool for new employees, helping them understand each
step of the quality control process.
Benefits of Flow Charts:
U-11Statistical Quality Control Part 1

[Audio] U-11Statistical Quality Control Part 1
Flow Chart in Construction. 

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Flow Chart  in Construction
U-11Statistical Quality Control Part 1

Flow Chart in Construction
U-11Statistical Quality Control Part 1. 

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[Audio] U-11Statistical Quality Control Part 1
Example (1) Flow Chart in Construction Scenario : During a large commercial building project, Using the this activities to prepare flow chart for the concrete pouring : Ready for Concrete: Check that the site is prepared, forms are in place, and reinforcements are correctly positioned. Concrete Mix Design: Verify that the mix design complies with specifications before proceeding with the pour. Adjust Mix Ratio: If the mix doesn't meet the specifications, adjustments are made, and the mix is re-tested.. 

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• Scenario : During a large commercial building project, Using the this activities to prepare flow chart
for the
concrete pouring :
• Ready for Concrete: Check that the site is prepared, forms are in place, and reinforcements are correctly
positioned.
• Concrete Mix Design: Verify that the mix design complies with specifications before proceeding with the pour.
• Adjust Mix Ratio: If the mix doesn’t meet the specifications, adjustments are made, and the mix is re-tested.
Example   (1) Flow Chart in Construction
U-11Statistical Quality Control Part 1

[Audio] U-11Statistical Quality Control Part 1
Example (1) Flow chart in Construction Monitor Slump/Temperature: During pouring, check the concrete slump (workability) and temperature to ensure they meet the project specifications. Curing Process: Begin the curing process after pouring to ensure that the concrete gains strength according to the specified time.. 

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• Monitor Slump/Temperature: During pouring, check the concrete slump (workability) and temperature to
ensure they meet the project specifications.
• Curing Process: Begin the curing process after pouring to ensure that the concrete gains strength according to
the specified time.
Example  (1) Flow chart in Construction
U-11Statistical Quality Control Part 1

PowerPoint Presentation

QA/QC -203
Statistical Quality Control Part 1
Unit 11:
1
37
Pg:

avatar

U-11Statistical Quality Control Part 1
Objectives  Understand the concept of statistical quality control  Identify the types of statistical quality control  Understanding and Applying Quality Control Methods ( Flow Chart , Check List , Cause and Effects Diagram , Acceptance Sampling ) in Construction .

U-11Statistical Quality Control Part 1
Definition and Importance of S-Q-C in Construction 

Statistical Quality Control (S-Q-C--) is a methodology that applies statistical methods to monitor and control the quality of processes in construction projects. It ensures that construction processes meet predetermined quality standards by identifying variations in construction processes and materials early, thus reducing errors, defects, and rework.


S-Q-C is critical in construction because it provides a data-driven approach to quality management, enabling decision-makers to monitor project performance quantitatively, predict potential issues, and take corrective action before defects occur.

U-11Statistical Quality Control Part 1
Key Elements of S-Q-C in Construction 

Variation and its Sources: Variations in materials, workmanship, environmental conditions, and equipment can all lead to quality issues.


Control Limits and Specifications: Define acceptable ranges for performance parameters such as concrete strength, steel elasticity, or surface flatness in road construction.


Continuous Monitoring: Ongoing inspections and statistical testing help keep the project within defined quality limits.

U-11Statistical Quality Control Part 1
Types of Statistical Quality Control  Descriptive Statistics in Construction Descriptive statistics summarize large sets of data, such as averages (mean), standard deviation, and range. For instance, monitoring concrete strength samples over a week and calculating their mean and standard deviation helps in understanding material consistency.
 Statistical Process Control (S-P-C--)
S-P-C tools such as control charts and run charts help monitor process performance over time. This ensures that the construction process remains within control limits. A common example is using S-P-C to monitor the curing time and compressive strength of concrete over time.

U-11Statistical Quality Control Part 1
Developing Statistical Quality Control Plans  Steps to Implementing an S-Q-C Plan 
 Define Quality Standards: Set standards for each construction phase (for example, acceptable tolerances for concrete strength, steel reinforcement positioning).

 Identify Critical Control Points: Identify areas most susceptible to defects (for example, concrete mixing, steel welding).

 Establish Control Procedures: Create a procedure for regular sampling, testing, and control charting.

U-11Statistical Quality Control Part 1
Types of Statistical Quality Control  Acceptance sampling in Construction Acceptance sampling involves testing a subset of materials (like steel bars or asphalt) and making decisions about accepting or rejecting the entire batch based on the sample results. This reduces the need for 100% testing, making QC more efficient.

U-11Statistical Quality Control Part 1
Statistical Quality Control in Construction  Methods of Statistical Quality Control (S-Q-C--) in Construction Statistical Quality Control (S-Q-C--) utilizes various statistical methods to measure, monitor, and control the quality of processes in construction projects. These methods ensure that construction practices meet desired standards and that variations in processes are detected and corrected early to minimize defects. Below, we explore the major S-Q-C methods used in construction projects:

U-11Statistical Quality Control Part 1
Flow Charts in Quality Control 

A flow chart is a graphical representation of a process or system, illustrating the sequence of steps required to complete a task. In construction quality control, flow charts help visualize the workflow for completing tasks, ensuring all steps are followed in a logical, consistent manner.
Application in Construction Projects:

Process Mapping: Flow charts help map the workflow for construction tasks such as concrete pouring, formwork inspection, or equipment installation. By showing the sequence of operations, they ensure that all necessary steps are followed.

U-11Statistical Quality Control Part 1
Flow Charts in Quality Control 
Quality Assurance Procedures: Flow charts can be used to visualize how a quality assurance process works, ensuring that materials and workmanship meet specified standards.

Problem Identification: Flow charts are useful for tracing the root cause of a quality issue by visualizing where a deviation from standard procedures might have occurred.

U-11Statistical Quality Control Part 1
Components of a Flow Chart 
 Start/End (Terminator): Represents the beginning or end of a process.

 Process (Task): A box that shows a specific task or activity that needs to be performed.

 Decision: A diamond shape representing a point where a decision must be made (for example, "Is the material acceptable?").

 Flow Line: Arrows that show the direction of the workflow.

 Input/Output: Parallelogram shapes that indicate material inputs or process outputs.

U-11Statistical Quality Control Part 1
Benefits of Flow Charts:

 Clarity: Provides a clear, visual roadmap for completing tasks, helping to avoid confusion or missed steps.

 Process Optimization: Identifies inefficiencies or bottlenecks in the workflow, enabling teams to optimize the process.

 Standardization: Ensures that every team follows the same process, maintaining consistency across different projects or phases.

 Training Tool: Flow charts serve as a training tool for new employees, helping them understand each step of the quality control process.

U-11Statistical Quality Control Part 1
Flow Chart  in Construction

U-11Statistical Quality Control Part 1
Example   (1) Flow Chart in Construction 
 Scenario : During a large commercial building project, Using the this activities to prepare flow chart for the concrete pouring :

 Ready for Concrete: Check that the site is prepared, forms are in place, and reinforcements are correctly positioned.

 Concrete Mix Design: Verify that the mix design complies with specifications before proceeding with the pour.

 Adjust Mix Ratio: If the mix doesn't meet the specifications, adjustments are made, and the mix is re-tested.

U-11Statistical Quality Control Part 1
Example  (1) Flow chart in Construction 
 Monitor Slump/Temperature: During pouring, check the concrete slump (workability) and temperature to ensure they meet the project specifications.

 Curing Process: Begin the curing process after pouring to ensure that the concrete gains strength according to the specified time.