DAST DACC

CHAPTER ONE

My First Day on Site Was Not What I Expected

I arrived on site early that morning with a new helmet, clean boots, and confidence that only a fresh engineering graduate can have. I had passed strength of materials, structural analysis, soil mechanics, and reinforced concrete design. I believed genuinely that I was ready.

By noon, construction site had humbled me.

The project was already active when I arrived. Machines were running, workers were shouting across the site, and concrete was being poured somewhere at the back. Nobody stopped to welcome me. Nobody asked for my GPA. Nobody cared that I graduated with honors.

The site manager looked at me once and said,
“Engineer, go and check that column.”

That was it. No explanation. No drawings in my hand. Just go and check.

The First Shock: Drawings vs Reality

In school, drawings are clean. Straight lines. Perfect dimensions. Everything fits.
On site, nothing looked like the drawings I had memorized.

The column he asked me to check was already cast. The surface was rough. Some parts looked darker. At the base, I noticed small holes and weak patches. I remembered the word honeycombing from lectures, but standing in front of it felt different.

I asked a technician, “Is this column okay?”

He laughed.

“Engineer, this one don strong pass you.”

That was my second shock. The people pouring and vibrating the concrete had more confidence than I did and more experience.

Lesson 1

On site, confidence does not come from certificates. It comes from experience.

Concrete Does Not Behave Like Exam Questions

Later that day, pile head chipping was ongoing nearby. Some piles looked dry and solid at the top. Others were wet, weak, and almost crumbly below a certain depth. I was confused.

In school, concrete strength is a number: 25 MPa, 30 MPa, 40 MPa.
On site, concrete tells a story.

Nobody had taught me that:
• Bentonite slurry can contaminate concrete
• Lacustrine clay can hold water and affect curing
• Poor tremie control can create bleeding pockets
• Concrete below ground can look “alive” and weak during chipping

When I asked why some piles were weak, someone said,
“Na soil problem.”
Another said,
“Bentonite enter concrete.”
Another said,
“No proper vibration.”

All of them were partly right.

Lesson 2

Concrete quality is not decided only by mix design.
It is decided by soil, workmanship, supervision, and timing.

The Foreman Who Knew More Than Me

By the second week, I met the foreman properly. He had no degree. No COREN number. But he had poured more concrete than I had calculated in my entire life.

One day, I insisted that reinforcement spacing must follow the drawing strictly. He nodded, waited for me to leave, and adjusted it slightly.

Later, he explained calmly,
“Engineer, if we follow this drawing like this, concrete no go enter well.”

He was right.

That moment hurt my pride but saved the structure.

Lesson 3

Respect experience.
Do not confuse authority with knowledge.

“Engineer, Just Approve It”

The most dangerous lesson came early.

A pour was delayed. Concrete trucks were waiting. The client was angry. The contractor was panicking.

Someone pulled me aside and said,
“Engineer, just approve it. We’ll correct it later.”

That sentence is responsible for more structural failures than bad calculations.

In school, nobody teaches you how to say no under pressure. Nobody teaches you that delays cost money, and money creates pressure that flows downhill to the engineer.

That day, I realized something important:
• Engineers rarely fail because they don’t know calculations
• Engineers fail because they approve what they shouldn’t

Lesson 4

Your signature is more powerful than your calculator.
Once you approve it, you own it.

Soil Does Not Read Your Soil Report

Later in my career, I learned this the hard way.

A site investigation report said the soil was fine at a certain depth. On site, excavation told a different story. Water seeped in. The soil collapsed. Everything changed.

In school, soil is layered neatly:
• Clay here
• Sand there
• Bearing capacity calculated cleanly

On site, soil is chaotic.

Lesson 5

Soil reports are guides, not guarantees.
Always observe excavation behavior.

Why School Couldn’t Teach This

Looking back, I don’t blame the university.

You cannot teach:
• Pressure
• Ethics under stress
• Managing artisans
• Making decisions with incomplete information
• Engineering judgment

These things are learned:
• On noisy sites
• Under the sun
• With mistakes that stay with you

Lesson 6

Engineering judgment is developed, not taught.

The Real Meaning of “Engineer”

By the end of my first month, I understood something school never explained.

An engineer is not:
• Someone who knows formulas
• Someone who draws designs
• Someone who wears a helmet

An engineer is:
• Someone who makes decisions when things are unclear
• Someone who balances safety, cost, and reality
• Someone who protects lives even when it’s inconvenient

Key Takeaways for Young Engineers
• Expect shock. It’s normal.
• Respect artisans and foremen.
• Observe materials, don’t just trust reports.
• Never approve what you don’t understand.
• Document everything.
• Experience will teach you faster than textbooks. if you pay attention.

Closing

My first day on site did not make me a better engineer.
But it started the process.

This book exists because too many engineers learn these lessons the hard way—alone.

If you are reading this before your first site experience, you are already ahead.


Ruqoyah Bolanle DAST DACC Dast Dacc@

For everyone in this profession, you’ll agree with me that foundations are non-negotiable in structural engineering.
We may optimize column sizes, adjust beam layouts, or even change superstructure systems, but once a foundation fails, every other element becomes irrelevant.

Among foundation elements, piles are very common—especially where soil conditions are poor. And once piles are introduced, Pile Integrity Test (PIT) becomes one of the most important checks you’ll encounter on site.

What We Often Learn in School

In school, piles are mostly treated as a design problem:
• Determine pile capacity
• Classify as end-bearing or friction pile
• Apply safety factors

Once concrete is poured, attention quickly shifts to pile caps and superstructure.

But site experience taught me that casting a pile does not guarantee its integrity.

What Site Experience Taught Me

On site, piles are exposed to real construction challenges:
• Soil collapse during drilling
• Improper tremie concreting
• Segregation and necking
• Interrupted concrete supply
• Groundwater intrusion

From the surface, the pile head may look perfect.
Below ground? No visual confirmation at all.

That’s where Pile Integrity Test (PIT) comes in.

Understanding PIT in Simple Terms

Pile Integrity Test is a low-strain, non-destructive test carried out to check:
• Continuity of the pile
• Changes in cross-section
• Possible defects (necking, cracks, voids)
• Approximate pile length

A light hammer impact is applied at the pile head, and wave reflections are analyzed to detect anomalies along the pile length.

Key Things to Understand When Reviewing PIT
1. PIT checks integrity, not load capacity
A pile may pass capacity design but still fail integrity.
2. A “failed” PIT does not always mean rejection
It signals the need for:
• Further investigation
• Coring
• CSL testing
• Design review or strengthening
3. Construction quality directly affects PIT results
Most PIT failures I’ve seen are tied to:
• Poor concreting control
• Inadequate tremie practice
• Rushed pile installation

How I Personally Handle PIT on Large Projects

When dealing with many piles, checking every result in detail can be overwhelming. This is how I approach it:
1. I first review the piling method statement
If the method is weak, PIT issues will follow.
2. I scan for abnormal signals first
Instead of over-analyzing all piles, I focus on:

• Sudden impedance changes
• Early reflections
• Inconsistent pile lengths

3. I pay attention to repeated patterns
If several piles in the same zone show similar issues, it often points to a systemic construction problem, not isolated defects.

This approach saves time and helps me focus on what truly matters.

Final Takeaway
School taught me how piles should work.
Site taught me how piles actually fail.

Pile Integrity Test bridges the gap between design assumptions and construction reality, and ignoring it is a risk no project should take.

Contact DAST Designs and Construction Company Ltd for more details. 08092412088 WhatsApp. [email protected]