Thermal Conductivity of No-Fines Concrete

In simple word thermal conductivity is a measure of ability of a material (here concrete) to conduct flux of heat through concrete. The units used are j/m2s0C/m or Btu/ft2h0F/ft.


In normal concrete, this property depends largely on composition of concrete mix. The typical value of thermal conductivity is about 1.4 to 3.6  j/m2s0C/m when concrete is saturated.


Normally density of concrete doesn’t influence (or influence negligibly) the conductivity of normal concrete. But when lightweight aggregate is concerned, this value varies with density of such concrete.
External wall of no-fines concrete provides thermal insulation
In lightweight concrete there have more air voids and we know air have low conductivity; so this concrete conducts less heat through them.


Our concern is here no fines concrete, which is also of lightweight and should have less thermal conductivity relative to ordinary concrete. The typical value for this concrete varies between (0.69 to 0.94)  j/m2s0C/m when the aggregate is itself normalweight.


Again when lightweight aggregate is used to produce this lightweight concrete the thermal conductivity drop down to 0.22 j/m2s0C/m.


But thermal conductivity is increased considerably when moisture content in concrete is very high. This property is important in determining thermal strain, cracking, warping (at very early age of concrete) and designing thermal insulation. We have discussed about thermal conductivity of normal concrete and some posts about behavior concrete under exposure to fire and explosion. You are invited to read these posts.

1 comment:

  1. Dear Colleagues,

    We are KALMATRON® a SUPER CONCRETE ADDITIVE that we believe has no equal in the United States or world-wide.

    We’re representatives of Kalmatron® Corporation manufacturer of Concrete Class Upgrading Admixtures, Remedial Coats, and Concrete Regenerative Sprays.

    KALMATRON®KF - I a new generation of equivalent KALMATRON®KF- I is a heat-resistant MIXTURE protects surfaces from high temperatures.

    KALMATRON®KF- I is produced by special technology of non-asbestos cement powder with the addition of modifier KALMATRON®. Before application must be mixed with water. It is characterized by high resistance to high temperatures and creates a liquid-impermeable coating for roofs, floors, pipes supplying boiling water, heating, etc. It provides a durable coating, resistant to weathering and biological. KALMATRON®KF- I applied with a brush or trowel under both dry and wet. For extremely hard and porous surface with a high compressive strength, abrasion-resistant, impermeable to liquids, resistant to emit steam and freeze-thaw;

    DESCRIPTION OF KF-I
    KALMATRON® KF-I is a thermo resistant inorganic, non asbestos compound designed for heat/cold protection of concrete, masonry, and wooden structures. KF-I is impermeable to liquids and attenuates temperature cycles.

    USES OF KF-I
    KALMATRON® KF-I is applicable for industrial walls and ceilings of metallurgic and chemical industries, food processing and storage facilities, cooling tanks of nuclear plants, fire protection separators, boiled water supply pipes, heating joints, etc.

    PREPARATION OF KF-I
    Add 4 parts of KF-I to 1 1/4 parts of water by volumes and mix to desired consistency.

    PREPARATION OF SURFACES
    KF-I can be applied to any type of surface. However, some surface textures may require the standard metal wire net to be applied first. For instance, it must be applied onto a wooden surface, severely damaged masonry walls and concrete ceilings.

    APPLICATION
    Applicable by plaster technology, shotcrete or even gunite for damp or leaking conditions. KF-I is completely non toxic and can be safely applied in such structures as water supply systems and food processing plants.

    ESSENTIALS & BENEFITS
    KALMATRON® KF-I is the most sufficient, liquid impermeable heat/cold isolation material for industrial applications.

    The simple application process requires only standard equipment.
    The sanitary requirements are the same as for regular plaster jobs.
    KF-I needs no combination with other isolators because it is highly efficient by itself.v KF-I modifications are available for radiation attenuation and upgraded resistance to severe climate and chemical corrosions.

    The most economical on the world market.
    https://mail-attachment.googleusercontent.com/attachment/?ui=2&ik=b3c5642596&view=att&th=13ff3a5795d9a3d1&attid=0.1&disp=inline&realattid=71dff6e2ced023a0_0.1&safe=1&zw&saduie=AG9B_P9H4GBYvSEIXcHwiFs3i7yn&sadet=1374553307145&sads=5gmab5vk07RAc0dE8MSkVOpBAtQ&sadssc=1

    file:///C:/Users/Dilip%20Shah/Downloads/TDS%20KALMATRON%20KF-I.doc%20(7).pdf

    KF-I is not a paint.
    KF‐I
 will
 perform
as 
an
 insulation,
 partition
 of 
insulation
 with
 structural 
properties 
and 
light 
structural
 concrete.

 Please, open attachment.
    It's all published on website www.kalmatron.com .

    Do not hesitate to ask about sample for your trials even on a job site.

    This technology brings a new economical concept, where KALMATRON® KF-I reduces the cost per square foot of concrete up to 2 times. Our clients say:

    NRD Industries. USA
    E-mail : nrdindustries@gmail.com
    Websites
    www.drivewayoverlay.com NEW!
    www.greenbuiltconcrete.com NEW!
    www.kalmatron.com
    www.shieldcrete.com
    www.concreterepair.name
    www.concreteadmix.com
    www.shotcreteadmix.com
    www.parkingconcrete.com
    www.seismicstar.com
    www.blockdegree.com
    www.wineryrepair.com
    www.kalmatron.cn
    www.nrdindustries.com
    http://nrdindustries.wordpress.com

    ReplyDelete