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Phoenicia University
Solid Slabs From A to Z
Dr. Ashtarout Ammar
May 17,2019
Intro
Design
Materials
Construction
Project Overview (1)
Overview
Project Overview (2)
Green Office Building Facility consists of:
- Four upper floors
- Three basements
Solid Slab
- A solid slab is a STRUCTURAL element
- It is made up of REINFORCED CONCRETE
- It provides a SMOOTH FLAT SURFACE
- It supports LOADS
Solid Slab Definition
LOADS
Loads
Dead Loads
Dead Loads
consist of self-weight of :
- slab
- column
- beam
Superimposed Dead loads
Dead Loads
floor finishes: services,partitions,light weight partitions,roof( water proofing+screed) , cable wires , , plumbing pipes, AC duct
LIVE LOADS
....................................................... 5KN/m2
..................................................................................................... 2.5KN/m2
- Corridors and Stairs
- Offices
- Mechanical/Electrical Equipment
- Light Storage Areas
- Heavy Storage Areas
........... 5KN/m2
........................................................... 6KN/m2
Live Loads
..................................................... 12KN/m2
wind Design
Seismic Design
- Per ASCE 7-2017
- Pw(lb/ft2) = Ce.Cq.qs.Iw
- Per IBC 2012 & ASCE 7-2017
- Acceleration of Earthquake
- Mass of structural Elements
- E = ρ Eh + Ev
Wind & Seismic Loads
Capacity
Capacity should be greater than Ultimate load
Capacity
Concrete Compressive Strength (F'c)
35 MPa
Concrete Mix Design
Concrete Mix
Preparation
Portland Cement Type I
10 & 20mm coarse Aggregates - Sand - Cement - Water
Preparation
- Cement Type:
- Component of Concrete Mix:
- Cementation Content:
- Water to Cement Ratio:
- Workability:
min(310 kg/cm3) - max(540 kg/cm3) - Used(350 kg/cm3)
min(0.3) - max(0.45) - Used(0.4)
Slump test: min(50mm) - max(75mm) - Used(72mm)
Calculations
Given: SG(cement)=3.15 , SG(water)=1, SG(20mm Agg.)=2.856,
SG(10mm Agg.)=2.854, SG(sand)=2.573
Find: SSD(20mm Agg.)=2.884, SG(10mm Agg.)=2.878, SG(sand)=2.605
calculations
A) Degreeof Absorption: Ab.(20mm Agg.)=0.97%, Ab.(10mm Agg.)=0.83%, Ab.(sand)=1.23%
B) Water amount= w/c * c =0.4*350=140 L
Vc= 350/(3.15*1000)=0.11 m3
C) In 1 m3 of Concrete:
Vw= 140/(1*1000)=0.14 m3
MAgg=D*V
VAgg= 1-(Vc+Vw)=0.75 m3
Vcoarse=0.75*0.62=0.465 m3 - Vfine=0.285 m3
Testing
Testing
Reinforcement
High Grade Steel (Fy)
Reinforcement
Placement
Steel is placed depending on moments:
- Positive Moment: steel is placed at the bottom of the slab
- Negative Moment: steel is placed at the top
Placement
Splicing or Overlap
Splicing
- Splicing is to connect something newly build to something old-built
- Connecting an old slab and new slab should be based on some criteria:
- Distance between the old and new
- Distance is related to the diameter to the old one.
Phase 1: Preparation
STEP 2
STEP 1
STEP 3
Preparation
Temporary Supports
Spacers (2.5 cm)
Framework (PLY Wood)
Phase 2: Progress
STEP 6
STEP 4
STEP 5
Progress
Reinforcement Placement
Concrete Pouring
Screeding
Phase 3: Control
STEP 9
STEP 7
STEP 8
Control
Concrete Curing
Remove Framework
Progress construction