southampton solent university
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Southampton Solent University. Southampton Solent University with the Good Earth Trust promotes projects in Africa that utilise interlocking rammed earth blocks. Commercial brick kilns Oil fired / coffee husks?. Quarried stone blocks. Transport?. Deforestation. Release of CO 2. - PowerPoint PPT PresentationTRANSCRIPT
Southampton Solent University
Southampton Solent University with the Good Earth Trust promotes projects in Africa that utilise interlocking rammed earth blocks
Commercial brick kilns
Oil fired / coffee husks?
Quarried stone blocks. Transport?
Deforestation
Release of CO2
Manual production of ISCEB?
The interlocks between the earth blocks reduces the need for 10+mm mortar joints as can be seen here with fired bricks
Hand made un-stabilised blocks in Eastern Chad
HAT & BOOTS!
1year of weathering in exposed UK location
LIME PLAIN CEMENT
6 years of weathering in UK
Rammed Lime Plain Cement
Lime and cement stabilisers arenormally used, but research into theuse of enzymes and polymers isbeing conducted to provideinnovative low carbon alternatives tocement. Also, there is significantresearch into the production of lowcarbon cements
Lime stabilisation:Calcium carbonate in varioustypes of limestone are burnt andslaked to produce hydrated, hydraulic or natural-hydraulic limes (NHL). Normally, NHL is mixed with the soil to produce
stabilised blocks.
Low carbon cements: In a drive to reduce theenvironmental impact of cement, different low carbon alternativesare being developed. These willhave a dramatic effect on the
amount of CO2 used instabilising ISSB earth blocks.
Enzymes:These are bio-molecules or proteins
that will create a catalytic chemical
reaction in soils to produce blocks
of similar strength and durability to
cement or lime stabilised blocks.
Polymers:
Geopolymers are based on lumino silicates that create a chemical process to turn them into a binder that does not release CO2, and takes place at temperatures lower than that needed for cement production. 300 kg of CO2 per tonne is emitted, compared with 700+ kg for OPC.
Two materials are used to create a geo-polymeric cross-linking of clay soils. Sodium hydroxide, NaOH (caustic soda) is mixed with lime and a reaction takes place at low temperatures in excess of 25°c to stabilise blocks
Surface treatments:Not only can the durability of a blockbe improved by stabilisation, theapplication of various coatings willalso improve them. 4:1 old engineoil/diesel mix proves very effective
Engine oil and unfinished after
erosion.
Plain Lime Cement
Conclusions:There is a need for a dedicated research project into different low carbon alternatives to stabilising Interlocking Stabilised
Compressed Earth Blocks
‘my dad says this stabilised earth block wall has been here for 14 years’
Further details from [email protected]