01-06-2012, 11:37 AM
CODE OF PRACTICE FOR PRESTRESSED CONCRETE
CODE OF PRACTICE FOR PRESTRESSED CONCRETE.PDF (Size: 491.76 KB / Downloads: 272)
FOREWORD
0.1 This Indian Standard (First Revision) was adopted by the Indian
Standards Institution on 30 December 1980, after the draft finalized
by the Cement and Concrete Sectional Committee had been approved
by the Civil Engineering Division Council.
0.2 This standard was first published in 1960. This revision was taken
up with a view to keeping abreast with the rapid development in the
field of concrete technology and also to bring in further clarifications
and modifications in the light of experience gained while applying the
provisions of the earlier version of the code to practical situations.
SCOPE
1.1 This code deals with the general structural use of prestressed
concrete. It covers both work carried out on site and the manufacture
of precast prestressed concrete units.
1.2 Special requirements of structures such as pipes and poles covered
in respective codes have not been covered in this code; these codes
shall be used in conjunction with this code.
MATERIALS, WORKMANSHIP,
INSPECTION AND TESTING
4. MATERIALS
4.1 Cement — The cement used shall be any of the following, with the
prior approval of the engineer-in-charge:
a) Ordinary Portland cement conforming to IS : 269-1976*;
b) Portland slag cement conforming to IS : 455-1976†, but with not
more than 50 percent slag content;
c) Rapid-hardening Portland cement conforming to IS : 8041-1978‡;
and
d) High strength ordinary Portland cement conforming to
IS : 8112-1976§.
CONCRETE
5.1 Grades — The concrete shall be in grades designated as per Table 1.
5.1.1 The characteristic strength of concrete is defined as the strength
of the concrete below which not more than 5 percent of the test results
are expected to fall.
WORKABILITY OF CONCRETE
6.1 The concrete mix proportions chosen should be such that the
concrete is of adequate workability for the placing conditions of the
concrete and can properly be compacted with the means available.
Suggested ranges of values of workability of concrete are given in
IS : 456-1978*.