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Method statement for Block works

Objective:
This method statement to define the requirements for execution of Autoclaved AeratedConcrete (AAC) block works.

2-Scope:
For internal and external block walls of the Hospital under the scope of the contract.

3- References:
1. Project approved drawings.
2. IS6041(1985) Code for AAC block


4 Procedure:
4.1 Submittals
4.1.1 ABC will submit AAC blocks supplier and sample for the consultant's approval.
4.1.2 ABC will submit AAC blocks Adhesive for the consultant's approval.
4.2 Preparations
4.2.1 The area/floor proposed to start the block work activity in, should be cleaned fromany debris, old mortar, dust
 4.2.2 The surveyor will set out all the required axes, offset lines and points.
4.2.3 The block work area will be wetted with waterinvariably be laid in ordinary mason's mortar, theComposition of bedding mortar 1:1:6 (1 cement: 1 lime: 6 sand).

4.2.4 Surface of AAC blocks to be joined with mortar is to be wetted.
4.2.5 The mortar for AAC block will be blocks adhesive.
4.2.6 The base bed courses must
4.2.7 The joint adhesive thickness should be approximately 2-3 mm, and the thickness of  joint for base course bed should be at least 12.5 mm.


4.3 Connections
4.3.1 Wall to Wall connections: In case of L connection interlocking bond will be used, and the galvanized steel ties will be used every three courses in case of T connection.

4.3.2 Wall to column Connection: Mason's mortar should be used at all wall to column Interface joints, columns should be brushed dust-free, and if necessary roughened by basting to ensure good bond. Walls should be mechanically tied to columns with30 cm steel anchor rods 2T10 mm every two courses.

4.3.3 In case of Wall to beam Connections and wall to floor soffit connections: ordinary mason's mortar should be used. 4.4 Block laying:
4.4.1 The first course of the block will be laid in a full bed of ordinary mortar. Thiswill
 be inspected for internal dimensions, door sizes, distances …
 4.4.2 The block mason will complete the wall on the approved first course.
or verticality, alignment …..
4.4.3 The maximum height to be built in one day is 1.6 m (8 courses).
4.4.4 For the walls not have opening for doors and windows the heights more than 3 ma concrete tie beam 200 mm depth will be poured for stiffness purposes

4.4.5 For the walls have opening for doors and/or windows the overhead lintels shouldbe continue along the wall and in this case no need for concrete tie beams.


4.4.6 In-situ reinforced concrete lintels and beams should be 4T10 and T8/30 cm stirrups.
4.4.7 Cast-in-situ reinforced concrete window sills with 200 mm depth, 4T10 and T8/30cm stirrups.
4.4.8 Keep AAC unit work free of mortar droppings as work progresses and, at completionof work, rub AAC unit to remove excess mortar.

4.4.9 The block walls will be finally inspected by Engineer f 

4.4.9 Tolerances:
1. Maximum variation from plumb: 0.6mm in 3 m, not exceeding 0.9mm in 6m.

2. Maximum variation from level: 0.6 mm in 6m, not exceeding 12.5mm in 15 mor more.


5 Inspection for block works

5.1 Cleaning of concrete surface
5.2 Setting out the first course.
5.3 Inspection of the block wall.
Thank You

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