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Durability and Repair of Concrete Structures




Course Overview

Where does the responsibility of a consulting engineer or contractor end?  On the completion date, at the end of a maintenance period or when the structure requires maintenance some 50 years after construction.  From whom can the client claim costs of repair at that stage?

Concrete is subject to deterioration due to several factors ranging from abrasion of floor surfaces, exposure to acids and corrosion of steel reinforcement.  Proper specification, testing and workmanship can prolong the useable life-span of reinforced concrete structures.

Description of course

The two-day course will deal with many of the deterioration mechanisms of concrete that can make a reinforced concrete structure partially or totally unusable, aesthetically unacceptable or unsafe.  The incidence of acidic gasses in the atmosphere is increasing steadily and is able to reduce the ability of concrete to protect steel reinforcement.  The mechanism is not clearly understood by designers and contractors, and will be explained along with the cause of many other aggressive factors that act on concrete.

Course outline

·         Constituent materials for concrete and their effects, particularly cement extenders such as Blastfurnace slag  or Pulverised fuel ash

·         Aggregates and their influence on shrinkage, elastic modulus, alkali aggregate reaction, water demand, absorption and cracking

·         Properties of concrete in the plastic, green and hardened states and site operations in each state to prolong the life-span of concrete

·         Deterioration mechanisms on hardened concrete

o   Mechanical deterioration such as cracking, abrasion, salt crystallisation, freeze thaw, thermal cracking and modulus of elasticity

o   Environmental factors such as acidic gasses and chlorides

o   Erosion by moving water and attack by pure water

o   Additional stresses due to structural misalignment

o   Interface between different materials and fire damage

o   Durability testing for protection of steel reinforcement

·         Detection and repair of concrete defects

o   Visual examination

o   Concrete sounding and half-cell measurements

o   Use of covermeter, strain gauge, Schmidt hammer, pull-off test

o   Repair of defects, repair of cracks, removal and repair of defective concrete, surface preparation and repair materials

o   Repair of specific structural elements

Course outcomes

·         An awareness of concrete deterioration and how to avoid many of them by proper specification and workmanship

·         Protection of structures and prolonging their life-span in the interests of the client

·         Expertise in the design of concrete mixes to promote impermeability and resist the ingress of chloride ions or acid gasses

·         An understanding of concrete surface finishes to promote abrasion resistance

·         The ability to identify aggressive materials that will be found in the structural environment and specify or build in protection mechanisms

Who should attend?

·         Designers of reinforced concrete structures where the client has an anticipated life-span without maintenance

·         Contractors who want an awareness of the effects of poor material selection and workmanship

·         Client and government bodies who wish to protect reinforced concrete assets which are very expensive to construct

·         Specialist contractors who undertake repairs of concrete structures

·         Suppliers of ready mixed concrete who need to design concrete for special purposes

Type: Course
CESA Validation Num: CESA-652-12/2017
CPD Points: 2
Coordinator: Blessings Banda
Provider: BA Raath & Associates
Presenter: Bruce Raath
Fee: R 5 325.00 excl. VAT
R 6 070.50 incl. VAT
R500.00 discount incl. VAT for CESA members
  • CESA Training Centre, Johannesburg , Paulshof
  • Mon 16 October 2017  08:30 to 16:30
  • Tue 17 October 2017  08:30 to 16:30