Concrete 101: Shotcrete & Gunite Applications

Sometimes concrete doesn’t get poured — it gets sprayed. That’s the case with shotcrete (also called gunite in some applications), a method where concrete is pneumatically projected through a hose at high velocity.

What is Shotcrete?

Shotcrete is concrete or mortar conveyed through a hose and “shot” onto a surface.
It’s applied using compressed air, which compacts the mix as it hits the surface.
It can be either wet-mix (pre-mixed with water before spraying) or dry-mix (water added at the nozzle).

Where It’s Used

Swimming Pools: Creates curved, watertight shells.
Retaining Walls & Slopes: Stabilizes soil and rock faces.
Tunnels & Mines: Provides quick, strong linings for underground structures.
Architectural Features: Allows for creative, free-form shapes that are hard to achieve with traditional formwork.

Why It Matters

Shotcrete is versatile, fast, and efficient. It can be applied overhead, on vertical surfaces, or in tight spaces where standard pours aren’t practical.

👉 Next time you’re near a pool or tunnel, remember — that strong, curved surface may have been sprayed, not poured.

⚠️ Legal Disclaimer:
This blog post is intended for informational purposes only and should not be taken as professional, legal, or construction advice. Every project is unique, and conditions may vary. RLW Concrete LLC is not liable for any actions taken based on this information. Always consult with a qualified professional or attorney for your specific needs.
License #PA65009

Comments

📰 Introducing: RLW — The Mixer Minute

📰 Introducing: RLW — The Mixer Minute Your new go-to source for all things concrete. At RLW Concrete LLC, we know concrete inside and out—but we also know that not everyone does. That’s why we’re launching The Mixer Minute , a fresh new blog designed to educate, inspire, and connect with our customers and community. Whether you’re a homeowner planning your first patio, a DIYer with questions about finishing tools, or just someone who wants to learn more about the materials under your feet—we’ve got something for you. 👷‍♂️ Who We Are About RLW Concrete LLC RLW Concrete LLC is a family-owned business serving Central PA and the surrounding areas since 2010. Founded by Ryan and Robin Welder, our company is built on the values of family, integrity, and high-quality work. We’re proud to deliver exceptional service to every client, and we treat every job—big or small—with the same attention to detail and care. 🛠 What You’ll Find on The Mixer Minute : We’re kicking off the b...

Concrete 101: Understanding the Concrete Mix – What’s in the Bag?

🧱 Concrete 101: Understanding the Concrete Mix – What’s in the Bag? New to concrete? No problem. Whether you're pouring a slab for a shed or managing a new driveway install, it helps to know what’s actually in a concrete mix—and why it matters. At its core, concrete is a simple recipe: cement , aggregates , and water —but slight changes to that recipe can have a big impact on how your project performs. Let’s break down what goes into a standard mix and what each ingredient can do for your concrete. 🧪 The Basic Ingredients 1. Cement Cement is often confused with concrete, but it’s just one part of the mix. It's the binding agent —when combined with water, it reacts chemically (a process called hydration ) to create a paste that hardens and glues everything together. Most mixes use Portland cement , which is widely available and compatible with a variety of applications. 2. Aggregates ( Sand and Gravel ) Aggregates give concrete its volume and strength. These can ...

Concrete 101: A Brief History of Concrete

Concrete 101: A Brief History of Concrete RLW: The Mixer Minute Concrete is one of the most widely used building materials in the world today—but it’s not a modern invention. Its history stretches back thousands of years, proving just how reliable and versatile it is. Here’s a quick look at concrete through the ages. ✅ 1. The Ancient Origins The earliest forms of concrete date back to ancient civilizations. The Egyptians used a mixture of mud and straw for bricks and later developed a lime and gypsum mortar. But it was the Romans who perfected the use of concrete, mixing volcanic ash with lime and water to create structures that still stand today. ✅ 2. Roman Concrete Marvels The Romans built roads, aqueducts, and massive structures like the Colosseum and the Pantheon dome using concrete. Their formula allowed the material to resist cracking and even grow stronger over time when exposed to seawater. ✅ 3. Concrete Disappears—and Returns After the fall of the Roman Empire, ...

RLW: The Mixer Minute

Search This Blog