E05
IN-SITU CONCRETE CONSTRUCTION GENERALLY
SPECIFICATION FOR
IN-SITU CONCRETE CONSTRUCTION GENERALLY
SECTION E05
Revision
Date
Issue Authorised By
Approved for Issue
Date
Author S Williams
18 Sept 2007
clarkebond
PROJECT
Bettws School Newport
JOB No SC00940
Rev Page 1 of 3
E05
IN-SITU CONCRETE CONSTRUCTION GENERALLY
To be read with Preliminaries/ General conditions.
220
DESIGN OF STRUCTURAL CONCRETE
Standards:
- Design: To BS8110 and BS8007
- Drawings: To BS EN ISO 4157
- Reinforcement schedules: To BS 8666
Finished product: To comply with the requirements of design standard.
225
TEMPERATURE RECORDS
Requirement: Throughout period of concrete construction record:
- Daily: Maximum and minimum temperatures and at intervals of four hours (maximum)
- Under adverse temperature conditions: Temperature at commencement and end of placing.
Equipment: Submit proposals.
- Location: In the shade, close to the structure.
235
OPENINGS, INSERTS AND FIXINGS
Requirement: Collate all information.
Submit: Details where openings, inserts and fixings can only be accommodated by adjustments
to reinforcement.
Locate reinforcement: To ensure specified minimum cover at openings and inserts and to be
clear of fixing positions.
250 A
STRUCTURAL TESTING
Load testing where required shall be carried out in accordance with BS 8110-2, Section 9 and
under the direction of the CA.
290 A
ACCURACY OF CONSTRUCTION
Reference system: To BS 5964-1
Element shape and position: As set out in clause 291 B
- Substitution of alternative requirements: None.
291 B ACCURACY OF CONSTRUCTION
Formwork shall be so constructed and supported that after it is struck the dimensions of the
concrete shall not vary from those shown on the drawings by more than the following
deviations (in mm). BS 5606 does not apply.
Element
Alignment
Foundations
± 10
Ground Beams
± 10
Walls
±5
Columns
±5
Beams
±5
Slabs
-Stairs
±5
Tolerances shall not be cumulative.
Level
± 10
± 10
± 10
-±5
±5
--
Verticality
--± 10 in 5m
± 10 in 5m
----
Dimension
± 25
+10/ - 0
± 10
±5
± 10
± 10
±5
Thickness
± 25
+10/ - 0
±5
±5
± 10
± 10
±5
300 A LEVELS OF STRUCTURAL CONCRETE FLOORS
Tolerances (maximum):
- Level of floor: As clause 291 B or as clause 315 below.
- Steps in floor level: 2mm maximum.
310 A
SURFACE REGULARITY OF CONCRETE FLOORS TO BS 8204 - GENERAL but not
including industrial ground floors.
Standard: To BS 8204-1 or –2.
Measurement: From underside of 2m straight edge (between points of contact) placed
anywhere on surface and using a slip gauge.
315
SURFACE REGULARITY OF CONCRETE FLOORS TO BS 8204 – TOLERANCE CLASS
SR2
Author S Williams
18 Sept 2007
clarkebond
PROJECT
Bettws School Newport
JOB No SC00940
Rev Page 2 of 3
E05
IN-SITU CONCRETE CONSTRUCTION GENERALLY
Location: All ground floor slabs
Abrupt changes: 2mm maximum
325 B THICKNESS OF GROUND FLOOR SLABS:
The ground floor slab should have a thickness of 175mm.
Ground bearing slabs on natural ground to have 1 layer of A252 mesh in the top with 40mm
cover.
Ground bearing slabs on improved ground to have 2 layers of A252 mesh, one top and one
bottom, with 40mm cover
Proprietary supports for reinforcement mesh to be used to achieve required cover. Slab
thickness tolerance to be –0mm and +10mm.
420
WATER RESISTANT CONCRETE CONSTRUCTION:
Description: Swimming pool tank, scum channels and related tanks and channels.
Form of construction: To BS 8102, type B with water penetration prevented
Design standard: BS 8007
Requirement: Work is to be water resistant when tested to clause E05/ 460
430
SURFACE CRACKING OF WATERTIGHT CONCRETE CONSTRUCTION
Method of measurement: Submit proposals
Critical crack width: 0.2mm
Action: Should cracks occur that are wider than the critical crack width:
- Survey: Frequency and extent of such cracks and investigate cause.
- Report: Findings together with recommendations for rectification.
460
TESTING OF WATER RETAINING STRUCTURES
Timing: To be agreed.
Recording: Maintain accurate test records at all stages.
Preparation for testing:
- Fill completed and clean structure to capacity with water at a uniform rate not exceeding 2m
depth in 24 hours.
- Maintain level by adding more water for an agreed stabilizing period.
Filled level: Accurately mark and record.
Permissible drop in level after allowing for evaporation and rainfall (maximum): 1/500th of the
average depth of the water.
- Test period: 7 days.
- Intervals for recording drop in level: 24 hours.
461 B
TESTING OF WATER RETAINING STRUCTURES
Method: In accordance with Clause 9.2 of BS 8007.
470
TESTING OF ELEVATED WATER RETAINING STRUCTURES
Requirements in addition to clause 460: During test period, the exposed faces of the
structure must show no signs of leakage and remain apparently dry.
Author S Williams
18 Sept 2007
clarkebond
PROJECT
Bettws School Newport
JOB No SC00940
Rev Page 3 of 3