Sushant
School of Art and Architecture
Compressed earth
block construction used to build workshop facility
The Shelter Group
at Development Alternatives and Tara Nirman Kendra are committed to the use of
appropriate technology in building construction. Building technologies and
process must be functional, resource conserving and environmentally sound.
Earth construction, particularly in the area of compressed earth blocks, has
been a major programme at Development Alternatives for over seven years. The
Shelter Group has carried out extensive work on materials research, machine
development, production and testing of blocks, design and construction of
buildings, information dissemination, and training of personnel in this field.
The workshop building
at the Sushant School of Art and Architecture (.S.S.A.A) in Gurgaon, Haryana,
is our most recent building project. Completed in March 1992, the building was
designed by a group of third-year architecture students from S.S.A.A., with
assistance from the Shelter Group.
The 1001-square foot structure is almost entirely built of cement-stabilised,
compressed earth blocks. The blocks were manufactured on the TARA Balram
manual press, using local solid from the project site and from a basement
excavation nearby.
The initial concept of the workshop space to be built as an extension to the
existing art studio came from the Dean, Mr. Mansinh M. Rana, and was
translated into sketch form by the students. It was apparent that the students’
sketches were inspired by the architecture of Hasan Fathy (the esteemed
Egyptian architect and father of modern earth architecture). These were
moulded into final design under the guidance of Shrashtant Patara and Zeenat
Niazi (architects form Development Alternatives) and Mr. Rana, who emphasised
the contemporary nature of the building and its role as a representative of
modern earth architecture.
An important factor in the design was the site itself. The building had to fit
into a grove of eucalyptus trees, resulting in its ‘L’ shape. A young neem
tree which came within the boundaries was made a part of the semi-open
verandah space and allowed to grow through an aperture in the stone roof.
To ensure efficient construction management, it was agreed that the central
responsibility would lie with one single agency. As a regular practitioner of
this technology, Tara Nirman Kendra was appointed as the building agency. The
students were invited to participate in the construction as much as possible.
The roof was point of major debate. According to one viewpoint, a curved roof
form (a natural outcome - since earth is best used in compression structures)
would not harmonise with the surrounding structures which have sloping
asbestos sheet roofs. The computer argument was that a different material and
a different technology should be treated as such, and need not necessarily
conform to its surrounding. An aesthetic balance must be achieved, however.
For
the School of Architecture, it was also important to have various
building types and styles. The debate finally ended in favour of a
curved roof of compressed earth blocks, with the learning value to the
students the deciding factor. |
It is
important to expose students of architecture and engineering to
alternative building materials and technologies |
The inner
space, determined largely by the site clearance and the most economical clear
spans possible, is divided into three parts. The two arms of the ‘L’ are
covered by jack-arches built with compressed earth blocks on composite steel
and RC (reinforcement concrete) beams. The central junction is roofed by a
dome 4.02 metres in diameter and 11.5 cm thick. also built with compressed
earth blocks.
During construction, the three work areas evolved as a single, uninterrupted
space - as all inner walls were removed and only essential structural supports
were left as basic dividers of space. This enhanced the feeling of openness in
the otherwise small space. One brick thick (9 inches or 23 cm) walls and
columns now enclose the workshop which will be used for clay modelling,
sculpture and wood-working.
The local soil available had a very high percentage of fine sand and was low
in clay content. Therefore the soil was stabilised with 5 percent cement and
25 percent coarse sand to achieve the required standard of strength in the
blocks. As the resultant block were found to be highly resistant to water
penetration, we decided to leave them exposed to the elements on the external
surface. Internally, the building has been plastered with a traditional
Rajasthani plaster of lime, sand and surkhi (brick dust).
Traditional
methods and modern technology were employed in the construction of the
building |
The
external cover of the jack-arches was adapted from the traditional terracing
practices of rural Rajasthan and Haryana. Small pieces of broken brickbats
were embedded in a layer of lime-sand-surkhi mix that was applied over the
jack-arch roof. Over this, another layer of the same mix, combined with
stone-grit, fenugreek (maithi seed) and mollases, was applied and the external
face of the jack-arch roof was beaten to firmness. This rather laborious
process eliminated the use of cement concrete in terracing for jack-arches.
For the dome, the external treatment consisted of a soil-based,
cement-stabilised plaster rubbed smooth to a water-resistant finish.
This project provided an excellent opportunity for the Shelter Group to
closely monitor the process of site and construction management. The tight
controls and records maintained at the site enabled the project team to
compile realistic costs per unit rates of each item of construction. The
building took 85 days to complete and was finished only one day behind
schedule, at a cost of Rs. 1.42,000 or Rs. 141.85 per square foot.
Even if more money were to be sent on upgrading finishes, the S.S.A.A.
building demonstrates that it is feasible to build and environmentally-sound
alternatives at considerably less than the normal cost.
For the Shelter Group, this project is one more step in our journey toward
widespread development and dissemination of technologies for improved earth
construction.
by Zeenat Niazi
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