QUALITY CONTROL MEASURES
TO PREVENT CONCRETE
FAILURE IN STRUCTURES
CASE STUDY: LAGOS AND ABUJA
Basement Construction
Basement Construction
Ikoyi, Lagos
PILE CAP (SUB – STRUCTURE) WATERPROOFING
Abijo Ibeju
Lekki, Lagos
PILE CAP (SUB – STRUCTURE) WATERPROOFING
Ikoyi, Lagos
BASEMENT FLOOR WATERPROOFING
Admiralty Rd Lekki,
Lagos
GROUND FLOOR WATERPROOFING
GENERAL OVERVIEW
Enforcing conformity standards on a concrete structure
is of top most importance. As such it is proactive to
subject the concrete to some established test so as to
ascertain the quality, compatibility, strength and
durability of such concrete delivery to determine its
chemical compositions and sustainability in alignment
with the structural design performance for its life
expectancy .
QUALITY CONTROL MEASURES ON
CONCRETE PROPERTIES
• Ultrasonic Pulse Velocity test
• Compressive Strength test
• Concrete Water Permeability test ACI 212 – 10-3R.
Coefficient of water permeability Darcy’s Law. Using
Universal Testing Machine
• Moisture Content test for Floors
• Rebound Hammer test for Floors and general concrete
• Salinity Resistance test
ULTRASONIC PULSE VELOCITY TEST
An ultrasonic pulse velocity (UPV) test is an in-situ, nondestructive test to
check the quality of concrete and natural rocks. In this test, the strength and
quality of concrete or rock is assessed by measuring the velocity of an ultrasonic
pulse passing through a concrete structure or natural rock formation.
This test is conducted by passing a pulse of ultrasonic through concrete to be
tested and measuring the time taken by pulse to get through the structure.
Higher velocities indicate good quality and continuity of the material, while
slower velocities may indicate concrete with many cracks or voids.
Ultrasonic Pulse Velocity can be used to:
 Evaluate the quality and homogeneity of concrete materials
 Predict the strength of concrete
 Evaluate dynamic modulus of elasticity of concrete,
 Estimate the depth of cracks in concrete.
 Detect internal flaws, cracks, honeycombing, and poor patches.
CONCRETE WATER PERMEABILITY TEST
Concrete contains some pores in its structure. These pores are the route for
substances to enter the concrete element. One of the chief reasons for the
deterioration of concrete due to corrosion of steel present inside concrete is
permeability. When the reinforcement steel meets with water or moisture, corrosion
of steel takes place. The rust formed due to corrosion of steel becomes
approximately 5 to 6 times the volume of steel-oxide layer. Due to this, development
of cracks on concrete begins, and also the concrete starts spalling. To avoid corrosion
in reinforcement and spalling of concrete, the concrete made, should be
impermeable. In some cases, the concrete slabs are made permeable purposely.
Permeability tests are important especially for Reinforced Cement Concrete (RCC) as
the reinforcement bars present inside the concrete element are prone to corrosion
when in contact with water. Due to corrosion, the volume of concrete expands and
leads to cracking of the concrete element.
So it is necessary to check the permeability of concrete and these pores can be
sealed with an effective crystalline waterproofing admixture
COMPRESSIVE STRENGTH TEST
The compressive strength of concrete is given in terms of the characteristic
compressive strength of 150 mm size cubes tested after 28 days (fck). In field,
compressive strength tests are also conducted at interim duration i.e. after 7 days to
verify the anticipated compressive strength expected after 28 days. The same is done
to be forewarned of an event of failure and take necessary precautions.
The characteristic strength is defined as the strength of the concrete below which
not more than 5% of the test results are expected to fall.
For design purposes, this compressive strength value is restricted by dividing with a
factor of safety, whose value depends on the design philosophy used.
IMPORTANCE OF COMPRESSIVE STRENGTH
 Determine the capacity of concrete to withstand loads before failure.
 Ensure that the concrete mixture as delivered on site meets the requirements of
the specified strength.
 Quantify the ability of concrete to resist compressive stresses among structures.
 Determine the potential strength of the concrete mix from which it is sampled.
 Ensure the stability of the concrete structure.
CONCRETE QUALITY CONTROL
HIGH PERMORMANCE FLOORING
Ikoyi, Lagos
EPOXY FLOORING SYSTEM
SPORT FACILITY SYSTEM
FLOORING QUALITY CONTROL
UNDERTILE WATERPROOFING,
ROOF WATERPROOFING & GREEN ROOF SYSTEMS
BEFORE ROOF WATERPROOFING ABUJA
DURING ROOF WATERPROOFING ABUJA
BEFORE ROOF WATERPROOFINGI
AFTER ROOF WATERPROOFINGI
EMEL HOSPITAL FESTAC TOWN LAGOSI
TERRACE WATERPROOFING
TERRACE, BALCONY,
BATHROOM UNDERTILE
WATERPROOFING
BALCONY
SWIMMING POOL PROTECTION
Basement Construction
DURING CONSTRUCTIONI
AFTER CONSTRUCTIONI
SWIMMING POOL WATERPROOFING
CONCRETE RESTORATION, REPAIR AND STRENTHENING
CASE STUDY STRUCTURES
PREVENTIVE MEASURES TAKEN ON THESE
STRUCTURES DURING CONSTRUCTION
CORONA DAY SECONDARY SCHOOL TRUST COUNCIL ABIJO IBEJU LEKKI
LEADWAY MARBLE HOUSE
IKOYI
MERISTEM PROJECT
GERRARD RD, IKOYI
ULESH BUILDING IKOYI
CHURCH GATE TOWER VICTORIAL ISLAND
EMEL HOSPITAL FESTAC TOWN, LAGOS
TRAINING TEAM