# RCC Structure & Foundations

> RCC structure and foundations are the footings, rafts or pile caps, columns, beams, slabs and cores that carry a building, built to IS 456. The foundation type is decided by a soil investigation, and the frame's long-term quality depends on mix design, compaction, cover to reinforcement, curing, and slump and cube testing on site.

## What we deliver

**Foundations, RCC frames, slabs, staircases, and structural works** for
commercial and industrial buildings — from groundwork upwards, with testing at
every stage.

Structure is the part of a building that is invisible once finished and
impossible to correct afterwards. The quality of what gets poured, compacted and
cured decides the building's life far more than anything added later.

## Scope of works

| Stage | What we deliver |
| --- | --- |
| Groundwork | Setting out, excavation, soil preparation |
| Foundations | Footings, raft or pile caps per the structural design |
| Frame | Columns, beams, slabs, shear walls |
| Staircases & cores | RCC stairs, lift and service cores |
| Reinforcement | Bar bending, placing, cover blocks, inspection |
| Concrete | Mix design, placement, compaction, curing |
| Testing | Slump, cube tests at 7 and 28 days |

## Where projects go wrong

- **No soil investigation.** The foundation is then designed on assumption.
- **Insufficient curing.** In Indian heat, concrete that dries too fast never
  reaches design strength.
- **Poor compaction.** Voids and honeycombing weaken the member.
- **Inadequate cover.** Reinforcement too close to the surface corrodes.
- **Service openings not planned.** Coring through a finished beam or slab later
  is risky and expensive.

## Why Hagerstone

**Civil works delivered from groundwork to completion** as part of a single
contract with the facade, MEP and interiors — so service openings and slab edges
are set out for the trades that follow.

**A 53-member site team and owned equipment** including core cutting, levelling
and lifting, under ISO 9001 / 14001 / 45001 and 79+ quality checkpoints.

## Standards referenced

Reinforced concrete to **IS 456:2000**. Foundations to **IS 1904**.
Earthquake-resistant design to **IS 1893 (Part 1)**.

## Frequently asked questions

### Why is a soil investigation necessary?

Because the foundation is designed on it. The bearing capacity and behaviour of the soil decide whether an isolated footing, a raft or piles are needed, and how large they must be. Designing without a proper investigation means either over-designing and wasting money or under-designing and risking settlement that shows up as cracks years later.

### How is concrete quality controlled on site?

Through the mix design, and then by testing what actually arrives — slump tests on delivery and cube tests at 7 and 28 days to confirm strength. Curing matters as much as the mix: concrete that dries out too fast in Indian heat does not reach its design strength regardless of how good the mix was.

### What causes cracks in RCC buildings?

Most often inadequate curing, poor compaction, insufficient cover to reinforcement, or settlement of the foundation. Some are cosmetic shrinkage cracks; others indicate a structural problem. Nearly all of the avoidable ones are prevented by site discipline during construction rather than by the design.

## Sources

- [IS 456:2000](https://standards.bis.gov.in/website/published-standards/department-wise) — Plain and reinforced concrete — code of practice
- [IS 1904](https://standards.bis.gov.in/website/published-standards/department-wise) — Design and construction of foundations in soils
- [IS 1893 (Part 1)](https://standards.bis.gov.in/website/published-standards/department-wise) — Criteria for earthquake resistant design

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Source: https://hagerstone.com/services/construction/rcc-structure-and-foundations