GP Testing

Tests June 1, 2013

    • One litre test cylinders, ┬átarget weight 1 to 1.2 kg, ┬átarget compressive strength 7MP
    • Weight GBFS
    • Weight Hemp hurd
    • Weight NaOH

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5g NaOH + 100g GBFS + 45ml water 90% hemphurd by volume.
5% solution NaOH has pH=14 ie 5g NaOH to 95g water
10% solution of NaOH = 5g NaOH to 45g water
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5g NaOH + 45ml water + 100g GBFS 90% hemphurd by volume.
Specific weight 650kg/cubic metre (300kg precursor 350kg dry hemphurd)NaOH 10kg/cubic metre hempcrete
GBFS 200kg/cubic metre hempcrete

Cost Calc. hemp hurd $ 50 /cubic metre compacted
GBFS 200kg $ 50 /cubic metre compacted
NaOH 10kg $ 10 /cubic metre compacted
Water 200l $ 0 /cubic metre compacted
Total material cost ca$110 /cubic metre compacted
20MPa readymix cost $220 /cubic metre Thornleigh-Cherrybrook plus gst
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Test 10%NaOH + 100g GBFS = 1part volume
add 10parts loose volume hurd gives 6parts compacted volume.

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Test1 17 Nov 2012
75ml water+50g NaOH very concentrated – activator – 100g GBFS precursor.
0.25l hemphurd no MgO or Lime

Mix fibre and GBFS add activator.

Press dry mix into moulds. Cure at room temperature.
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Test2 17 Nov 2012
50ml water+50g NaOH very concentrated – activator – 100g GBFS precursor.
0.4l hemphurd (compacted) no MgO or Lime

Mix GBFS and activator. Add fibre and mix well.

Press dry mix into mould. Cure at room temperature.
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Test3 18 Nov 2012
50ml water+50g NaOH very concentrated – activator – 100g GBFS precursor.
0.5l hemphurd(compacted) no MgO or Lime

Mix GBFS and activator. Add fibre and mix well.

Press dry mix into mould. Cure at room temperature.
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Test4 20 Nov 2012
50ml water+50g NaOH very concentrated – activator – 100g GBFS precursor.
0.6l hemphurd(compacted) no MgO or Lime
Mix GBFS and activator. Add fibre and mix well.
Press dry mix into mould. Cure at room temperature.
Measurment 40mm high 140mm diameter = 0.616cubic metres
weight 345g specific weight = 560kg/m^3
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very concentration NaOH
very hemphurd quantity
very particle size
very degree of compaction
very time of mixing
very water content

test water resistance 28 days
test flammability
test compressive strength 28 days
test flexural strength 28 days
test joining layers of hempcrete
test thermal resistance
test breatheability


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