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increase the application of AAC blocks in residential and commercial buildings,
the fire and explosion safety on the industrial buildings plays the important
aspect for the evaluation. Wang et al. (2017) discusses about the threat the
world is facing against the terrorist attack, which eventually leads to threat
to building from fire and explosion. For which the experiment on AAC panels was
conducted where various AAC block panels was used created with different
material laid on the outer part and impact behaviour of them were studied based
on the impulsive loading. The use of fibre reinforced plastic (FRP’s) with the AAC
blocks aided to enhance the anti-impact ability of the building walls, whereas
the fire resistance and the porous nature of AAC block reduces the sound and
thermal insulation, which eventually makes the building safe from the initial
impact from the explosion. It is noteworthy that the bi-directional wrapping scheme
enhances the bearing capacity of the AAC panel at a magnitude of 94.2%. The
mechanical properties of carbon fibre reinforced (CFR) sheet and the epoxy
resin used to increase the impact ability of AAC walls which cannot be
applicable for clay brick wall or RC blocks. To improve the performance of the
AAC block, fibre is to be added in the slurry at the time of casting.

Darshana and Venugopal (2015) supports the view of AAC having a high thermal
capacity and can absorbs large quantities of radiant heat and does not transmit
rapidly largely due to porous nature. The use of coal bottom fly ash adds to
the nature of thermal conductivity which is the need of an hour to tackle the excess
energy usage, and this is not possible when conventional cement is used. A
study by Kunzel (1995) proposed that the building materials must be
non-hygroscopic and capillary-inactive (hydrophobic) as the thermal insulation
lining of a building can be damaged by the silent culprit in the form of water.
Whereas Jerman et al. (2013) conducted various experiment to make an argument
regarding the relativity between thermal conductivity and capillary water
saturation in AAC blocks. The results showed that the thermal conductivity can
be as much as six times higher in capillary water saturation state than in dry
conditions. Also, the thermal conductivity is found to increase up to 50% when
temperature is increased from 2°C to 40°C which is massive when
Asian countries are taken into consideration as the temperature tends to
deviate in similar brackets round the year. Hence, it is evident that the
thermal conductivity of porous building materials is known to depend on both
moisture content and temperature in a substantial way.

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et al. (2008) acknowledged the main reason behind the seismic earthquake effect
on building. With the point of discussion being the major old buildings having
the traditional masonry work with clay bricks and stone which are unsustainable
to the seismic vibration by earthquake and tend to crumble under such
situation. Hence with the assistance of Seismic Displacement-based Adaptive Pushover
(SDAP) algorithm which reproduce the dynamic behaviour of masonry structures,
the various AAC masonry structure where studied and comparison were made with
the traditional masonry structure to simulate and assess the seismic performance
of different AAC masonry buildings with different structural typologies. The
results supported the assessment of Yardim et al. (2012) that the light weight of AAC material and its high deformability
(low value of Young modulus in compression) tends to reduce inertia forces on
the building induced by the seismic motion. The results of AAC building seismic
analyses point out that for 1-2 storey buildings and for low to medium levels
of excitation, the damage limit state may not be attained whereas for high rise
the performance against the seismic vibration of AAC masonry were much better
compared to traditional masonry from bricks and rocks.

Naresh and Karisiddappa (2013) suggested that the physical properties of
autoclaved aerated concrete block such as compressive and flexural strength,
the thermal insulation are at par or even better in certain cases with the RC
blocks and clay bricks, although the density of the block is 1/3rd
which resulted into great reduction in self-weight and thus may result into
lower structural cost. The value obtained for AAC masonry structure for the
walls were higher than the wire cut bricks and the traditional masonry in the
experiments conducted for the water permeability and thermal insulation along
with achieving requisite strength and elastic properties of masonry structure
proved the point of acceptance of AAC block over other bricks and traditional
masonry with clay bricks.

et al. (2016) observed the reduction
in thermal conductivity due to increase in pores in the block but
simultaneously it affected the compressive strength of the block. This led to
examination by adding polypropylene, carbon, basalt and glass fibres into
autoclaved aerated concrete used as the elements in the building. The change in
thermal conductivity value, compression and flexural strength were inevitable
in the results. The main aim was to find out the fibre which provided best
compression and flexural strength without compromising on the thermal
conductivity of AAC. The fibre reinforcement led to increase in bonding in
autoclaved aerated concrete which elevated the flexural strength. The
mechanical properties of AAC improved on adding above materials and results
were exceeding the numbers when compared to numbers of clay brick and RC
blocks. While carbon, polypropylene and glass fibres were increasing the
thermal conductivity of AAC, basalt fibre reduced it. Considering the thermal
conductivity value which is contemplated as an important feature in terms of
AAC, basalt fibre AAC has also given good results in each case. Author suggested
that based on the usage of the block, specific material can be added to suffice
the need.