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Unformatted text preview: cement content of
600 kg/m3 and a compressive strength not less than
use of pozzolana as an admixture to
Portland cement is not permitted. Unless otherwise
25 N/mm2 at 28 days. 4.1 For precast concrete pipes, materials complying specified by the purchaser,
used is left to the discretion the type of cement
of the manufacturer. to be Where the process of manufacture is such that the
strength of concrete or mortar in the pipe differs
from that given by tests on cubes, the two may be
related by a suitable conversion factor.
purchaser requires evidence of this factor, he shall
ask for it before placing the order. The conversion
factor for 28 days compressive strength for spun concrete may be taken as 1’25 in the absence of any
data. 4.3 Aggregates - Aggregates used for the manufacture of unreinforced and reinforced concrete pipes
shall conform to IS : 383-19707. The maximum
size of aggregate should not exceed one third the
thickness of the pipe or 20 mm, whichever is smaller.
4.4 Reinforcement - Reinforcement used for the
manufacture of the reinforced concrete pipes shall be
mild steel Grade 1 or medium tensile steel bars
conforming to IS : 432 ( Fart 1 )-1982* or harddrawn steel wire conforming to IS : 432 ( Part 2 )19829 or structural steel ( standard quality ) bars
conforming to IS : 226-1975lO. Where soft grade
wire is used, it shall conform to IS : 280-1978’l. 4.5.2 For pressure pipes splitting .tensile strength
of concrete cylinders at 28 days, when tested in
accordance with IS : 5816-9701, shall be 2’5 N/mm2.
4.5.3 Compressive strength tests shall be conducted
on I5 cm cubes in accordance with the relevant
requirements of IS : 456-1978’ and IS : 516-1959’. to IS : 1566-1982l’
NOTE- Wire fabric conforming
or deformed bars and wires conforming
to 1s : 178619851*may also be used. 4.5.4 The manufacturer shall give a certificate
indicating the quantity of cement in the concrete
mix. 4.5 Concrete or Mortar - Concrete used for the
manufacture of unreinforced and reinforced concrete
pipes and collars shall conform to 1s : 456-197814. 4.6 Rubber Ring - Rubber ring chords used in pipe
joints shall conform to Type 1A of IS : 5382-I967*. ‘Specification
for ordinary ,and low heat Portland
cement ( third revision ).
%pecification for Portland slag cement (third revision).
aspecification for Portland pozzolana I cement ( second
*Specification for rapid hardening Portland cement (first
5Specification for hydrophobic
Portland cement (first
for 43 grade ordinary Portland cement
(first revision ).
for coarse and fine aggregates
natural sources for concrete ( second revision ). 5. DESIGN
Reinforced concrete pipes either
spun or cast shall be designed such that the maximum
tensile stress in the circumferential steel due to specified hydrostatic test pressure does not exceed the
limit of I25 N/mm2 in the case of mild steel rods,
140 N/mm2 in the case of hard-drawn st...
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This document was uploaded on 10/01/2013.
- Fall '13