What are the Types of members in Prestressed Structures?
The physical tests to be conducted for fly ash at the site The intensity of these processes depends largely on the ash fineness (particle size and particle size distribution) so that the pozzolanic reactivity increases with the specific surface of the ash. International standard ASTM C 311 describesRead more
The physical tests to be conducted for fly ash at the site
The intensity of these processes depends largely on
the ash fineness (particle size and particle size
distribution) so that the pozzolanic reactivity increases
with the specific surface of the ash. International standard
ASTM C 311 describes the procedures of chemical and
physical methods for characterization of fly ash, and
standard ASTM C 618 provides chemical and physical
criteria related to classification.
all samples of ash that were for seven days exposed in a
humid environment contains a substantial amount of
amorphous glassy-matter, but also crystal phase of
feldspar, melilite, mullite, very little anhydrite and
quartz is present. In the specimens that were
subjected for 28 days besides the already mentioned
minerals a trace of calcite occurs in the sample;
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Pre-stressed concrete is a form of concrete used in construction. It is substantially prestressed during production, in a manner that strengthens it against tensile forces which will exist when in service. According to the construction methods there are two kinds of prestressed concrete :- - Pre-tenRead more
Pre-stressed concrete is a form of concrete used in construction. It is substantially prestressed during production, in a manner that strengthens it against tensile forces which will exist when in service. According to the construction methods there are two kinds of prestressed concrete :-
– Pre-tensioned concrete
– Bonded Post-tensioned concrete
– Unbonded Post-tensioned concrete
The three types of members in prestressed concrete are as follows:-
1. Neither allowing tension nor crack.
See less2. Allowing tension within permissible stress but cracking is not allowed.
3. Tension and crack both are allowed but within permissible stress.