Chemical and Physical Deterioration Mechanisms
(CED3104 : Repair and Rehabilitation of RC Elements – Module 1)
Dr. M. S. Haji Sheik Mohammed, Professor
Department of Civil Engineering
B.S. Abdur Rahman Crescent Institute of Science and
Technology , Chennai
Some Images and information are sourced from Internet and other Educational Materials for
demonstration purpose only 1
,CHEMICAL DETERIORATING MECHANISMS
2
,PHYSICAL DETERIORATING MECHANISMS
, Chemical 1. Alkali-Silica Reaction (ASR)
• The chemical reaction, in the
presence of moisture, between
the active mineral constituents
and the alkali hydroxides
present in concrete.
• Formation of alkali-silica gel of
unlimited swelling type –
formation of cracks.
• Initial cracks give access to more
moisture resulting in more
expansion, which in turn results
in more cracks.
4
(CED3104 : Repair and Rehabilitation of RC Elements – Module 1)
Dr. M. S. Haji Sheik Mohammed, Professor
Department of Civil Engineering
B.S. Abdur Rahman Crescent Institute of Science and
Technology , Chennai
Some Images and information are sourced from Internet and other Educational Materials for
demonstration purpose only 1
,CHEMICAL DETERIORATING MECHANISMS
2
,PHYSICAL DETERIORATING MECHANISMS
, Chemical 1. Alkali-Silica Reaction (ASR)
• The chemical reaction, in the
presence of moisture, between
the active mineral constituents
and the alkali hydroxides
present in concrete.
• Formation of alkali-silica gel of
unlimited swelling type –
formation of cracks.
• Initial cracks give access to more
moisture resulting in more
expansion, which in turn results
in more cracks.
4
