OUTLINE
In this research, gypsum and lime are mixed to the soil to promote the properties of the material. The gypsum stabilized soil sets in a short time, which makes the production time shorter and the curing unnecessary. It also makes the production period independent from the rainy days. The material is porous, thereby increases the insulting value.
The mechanized construction technology for the gypsum stabilized earthen construction aims to improve the local construction material for mass-housing. It will also contribute to preserve the natural sources and save funds for the country.
The Soil
To obtain required strength and durability
Traditional Earthen Construction | ALKER construction |
preprocessing | preprocessing is not necessary |
grinding |
|
sieving |
|
setting the soil aside |
|
30% clay | 10% clay |
Proportion of ALKER(Gypsum + Lime Adobe)
Ingredient | % by Weight | Practical Measures |
Soil | 100 | 2 full wheel barrow |
Gypsum | 10 | 4 shovel full |
Lime | 2 | 1 shovel full |
Water | 18-20 | 1 bucket full |
General Properties
Unit weight | 1.6-1.7 kg/lt |
Shrinkage | 1.0-1.5% |
Compressive strength | 2.0-4.0 N/mm2 |
Shear strength | 0.9-1.3 N/mm2 |
Water absorbtion | very low |
Long term water exposure
(except direct rainfall) |
no erosion |
Heat transfer value l | 0.4-0.5 kcal/mhC |
Specific calorific | 1.0 kJ/kgK |
Workability
Water Content | Workability |
18-29% | rammed earth |
20-22% | adobe blocks |
24% and more | segregation |
Curing
To obtain required strength and
durability
Traditional earth
construction |
ALKER construction |
15-21 days strengthing | 20 min. strengthing |
curing area | no curing area |
water sprinkling | no water sprinkling |
rain protection | no rain protection |
Construction
Earth:___________100 kg__________100%
without humus
clay (appr. %10) + silt + sand + grvel (7 cm)
Water:____________20 kg__________20%
Gypsum:___________10 kg__________10%
Lime:______________2 kg___________2%
mixer + earth + 2 kg water | 2 minutes mechanical mixing |
barrow + water 18 kg + lime 2 kg + gypsum 10 kg | 2 minutes hand mixing |
pour the barrow full of mixture into the mixer
(water 18 kg + lime 2 kg + gypsum 10 kg) |
3 minutes mixing |
pour the mixture to the wheel borrow; ramm it into the wall form | in no longer than 15 minutes |
Please inform Bilge ISIK
about
the results with your full address and a short CV.
Your interest is appreciated.