Hollow Concrete Block

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    HOLLOW BLOCK

    BHAVESH PETHANI (13BCL083)

    DHRUV PRAJAPATI (13BCL084)

    HITESH PRAJAPATI (13BCL085)

     ABHISHEK SHARMA (13BCL104)

    SUSTAINABLE BUILDING TECHNOLOGY

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    History •   The first hollow concrete b

    1890 by Harmon S. Pa

    States. After 10 years of ex

    patented the design in 19 were 8 in (20.3 cm) by 10

    (76.2 cm), and they were s

    be lifted into place with a s

    an estimated 1,500

    manufacturing concrete b

    States.

    •   These early blocks were u and the average output w

    per person per hour. To

    manufacturing is a highly

    that can produce up to 2,00

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     A   h o llo w m as o n r y defined as having

    cross-sectional area

    plane, parallel to the

    surface, less th p e r c e n t   of the gros

    sectional area in th

    plane

    DEFINITION

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    MATERIALS USED

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    (1)Proportioning

    (2)Mixing (4)Curing

    (3)Compacting

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    Types of machinery used

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    Type of machinery used

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    Type of machinery used

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    Type of machinery used

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    1

    2

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    SIZE

    Cavities

    1. 100× 200 × 400

    2. 200× 200 × 400

    The total width of the cavity in a

    the face of the block as laid in w

    surface will be at right angles to

    shall not exceed 65% of the total Shell Thickness

    The shell thickness of blocks shall not be less

    than 40 mm for sizes A & B and 20 mm for other 

    sizes. Joints The end of the blocks, which form

    may be plain rectangle and groov

    grooved.Aggregates •   Passes through IS sieve 1285mm

    •   15% should retained on IS sieve 10 mm and 10-

    40% on IS sieve 4.75 mm

    Quality Specific

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    1

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    Density

    Crushing Strength

    The block density hollow concrete block shall

    not be richer than 1600 kgs. Per cubic meter of 

    gross volume.

    The average crushing strength o

    immersed in water maintaining a

    for a period of 24 hrs bedded with

    shall be not less than 50 kg pe

    area.

    Drying Shrinkage

    The drying shrinkage of average of three blocks

    when unrestrained shall not exceed 0.004 per 

    cent. Moisture contents The moisture content (average of

    blocks on being immersed in w

    0.03 %.Water Absorption

    The water absorption (av. 3 blocks)

    shall not exceed 240 kg per cu meter.

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    Method of bui

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    Corner bonding

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    Estimating Data

    Blocks

    There are 121  ⁄  2 blocks in every square meter of wall surface area.

    Mortar 

    1m3 of mortar is required for approximately 800

    blocks.

    For a 1:1:6 mortar mix, the approximate quantities

    required for 1m3 of mortar are:

    6 bags cement

    6 bags lime

    1.2 m3 of damp sand (allowing 20% bulking)

    Grout

     Approximate quantities for filling concrete blocks

    and elements:

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    HOLLOW BLOCK

    RETAINING WALLS

    COLUMNS

    COMPOUND WALLS

    USES

    In view of their vers

    properties, hollow concr

    demand by depa

    engaged in construction

    Housing Boards and Urb

    Corporations, Road Tran

    and Forest Departments.

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    Some Creative Uses of HCB

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    LIFE CYCLE ANALYSIS Steps 4 steps

    1. goal and scope

    2. Life cycle inventory

    3. Life cycle impact analysis

    4. Interpretation of the

    results.

    One square meter of partition wall system is chose

    consumption and materials are based on this functio

    CO2e/m2 etc.

    The values

    impacts are 6

    /m2 and 0.018

    wall values a

    CO2 /m2 an

    respectively, r

    6% of total emb

    LCI is a technical, data-based proces

    and raw material requirements, a

    waterborne emissions, solid waste,

    the entire life cycle of a product ,proc

    EE: (Embodied Energy)

    GWP: (Global Warming Po

     AP: (Acidification Potential)

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    EMBODIED ENERGY

    THE BENEFITS OF HOLLOW

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    Economy in design of sub-structure due to reduction of loads Saving in mortar for lying of blocks as compared to ordinary brick work. Saving in

    Uniform Plaster thickness of 12 mm can be maintained due to precision o

    compared to brick work where plaster thickness of average 20 mm is required

    even plastered surface due to variations in the sizes of bricks.

    Insulation of walls is achieved due to cavity, which provides

    all times. Similarly hollowness results in sound insulation

    Paint on finished walls can be applied due to cavity, which

    saving for all times. Similarly hollowness results in sound insu

    No problem of the appearance of salts. Hence, grea

    maintenance of final finishes to the walls.

    THE BENEFITS OF HOLLOW

    CONCRETE BLOCK:-

    THE BENEFITS OF HOLLOW

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    Laying of Blocks is much quicker as compared to brickwork

    saving in time.

    Thermal insulation property of hollow concrete block is more

    ordinary brick wall.

    Hollow concrete block is environmentally eco friendly.

    Factor of safety of hollow concrete block is more than brick m

    Maintenance cost of the hollow concrete block is less than br

    THE BENEFITS OF HOLLOW

    CONCRETE BLOCK:-

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    DISADVANTAGE • Rising Damp: When groun

    wall from the base and migrat

    • Cracking: Often due to shrin

    or movement of the wall.

    • Efflorescence: Occurs whe

    salt are carried to the surface

    through the masonry.

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    The dead load of hollow concrete block is much lesser tha

    due to this, one can work with the structural engineer anconsumption in construction.

    Hollow concrete blocks require minimal mortar.

    If these blocks are engineered properly then dimensional a

    finishing quality is obtained

    Usage of lintel blocks brings tremendous operational efficie

    lower cost.

    Hollow concrete blocks have additives to improve their wat

    seepage minimization

    Why to use HCB??

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    Hollow concrete blocks can be engineered to achieve very h

    strengths.

    Hollow concrete blocks are much more sturdy.

    The hollow concrete block adopt to modern design forms

    texture etc.

    Minimum maintenance cost and cost competitiveness with ot

    it a preferred material for   today’s building.

    Hollow concrete blocks can effectively be used for cold sto

    go downs as they are thermally effective.

    Why to use HCB??

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    C SE STUDY

    SPRING FIELD ohio

    The house is a 1,300

    square foot, single-story

    structure. The house has

    concrete masonry

    exterior walls, a wood-

    framed floor deck over a

    crawl space, and wood-

    framed interior walls and

    roof trusses.

    BRICK MASONRY AND HOLLOW CONCRETE BLOCK-A COMPARISIO

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    BRICK MASONRY AND HOLLOW CONCRETE BLOCK A COMPARISIO

     Ahmad et.al

    • Materials used

    1. Cement:

    Khyber ordinary Portland cement of 43 grade confining to IS 8112:1989 wa

    the work .

    2. Sand:

    Sand used throughout the work comprised of plane river sand with maxim

    confining to zone II as per IS 383-1970 with specific

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