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E VALUATION APPLICABILITY OF USING NEUTRAL SOIL STABILIZER OF PLASTER AS SOIL IMPROVEMENT MATERIALS. Nagasaki University. R.Suzuki H.Sakanoshita Y.Tanabashi Y.Jiang S.sugimoto. Waste plaster board. Back ground of research. ・ Price is low ・ Excel in sound insulation and adiabaticity.

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E VALUATION APPLICABILITY OF USING NEUTRAL SOIL STABILIZER OF

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E

EVALUATION APPLICABILITY OF USING NEUTRAL SOIL STABILIZER OF

PLASTER AS SOIL IMPROVEMENT MATERIALS

Nagasaki University

R.Suzuki

H.Sakanoshita

Y.Tanabashi

Y.Jiang

S.sugimoto


Back ground of research

Waste plaster board

Back ground of research

・Price is low

・Excel in sound insulation and adiabaticity

Plaster board

It is used extensively

Scrapped construction


Back ground of research1

・ Increase of disposal cost

・Heavy metal and the hydrogen sulfide are detected

Back ground of research

Waste plaster board

・Emission increase

1.38million ton(2005)

1.76million ton(2010)

The resource recycling of them is an urgent problem


Purpose of research

Purpose of research

Recycle plaster

Waste plaster board

Disposed to harmless

Soil mixture

Pavement and filling material

Mechanical property

Chemical property

Evaluation of usability


Baseline characteristic of plaster

heat

CaSO4・1/2H2O+3/2H2O

CaSO4・2H2O

water

calcification

Environmentally thoughtful solidification material

Baseline characteristic of plaster

Chemical equation of plaster

Cement

Alkaline

Recycle plaster

Neutral


Experimental overview

Experimental overview

Several soil

Recycle plaster

Target strength②

300kPa

(banking material)

mix・chum

product under test

(φ=5cm、H=10cm)

Target strength①

50kPa

(conveyance)

Cure (constant-temperature zone)

(temperature25℃、humidity90%)

uniaxial compression test


Examination case

Examination Case


The characteristics of several soil

The characteristics of Several Soil


Pc cohesive soil

28th day

case CC(cement)

300(kPa)

7th day

50(kPa)

Strength growth

Solidification material function

PC(cohesive soil)

Compressive strength(KPa)

60

additive amount(kg/m3)

Additive amount increase


Ps sandy soil

Case CS(cement)

28th day

7th day

300(kPa)

Additive amount increase

PS(sandy soil)

Compressive strength(KPa)

60

additive amount(kg/m3)

Strength make no difference


Pa ariake cray

28th day

50(kPa)

7th day

Strength is low

PA(Ariake cray)

Compressive strength(KPa)

additive amount(kg/m3)

Additive amount is low


Pa ariake cray1

28th day

case CA(cement)

7th day

Strength growth

PA (Ariake cray)

Compressive strength(KPa)

additive amount(kg/m3)

The gap between cement and plaster is wide.

・Additive amount increase

・Moisture content down


Results of the uniaxial compression test

large

small

Moisture content have a large effect

Moisture content of PA

・170%

・120%

・80%

Alteration of unconfined compression strength

Results of the uniaxial compression test

・PC(cohesive soil) : solidification material

・PA(Ariake cray) : solidification material


Relation moisture and compression strength

50(kPa)

Strength growth

Reduced moisture content

Moisture content is 80%

Reached the 50(kPa)

Relation moisture and compression strength

300(kg/m3)

  • 7th day

Compressive strength(KPa)

200(kg/m3)

100(kg/m3)

Moisture content(%)


Relation moisture and compression strength1

300(kPa)

50(kPa)

Long cure

Several cases reached

300kPa

Relation moisture and compression strength

300(kg/m3)

(b) 28th day

Compressive strength(KPa)

200(kg/m3)

100(kg/m3)

Moisture content(%)


Heavy metals leaching test

Heavy metals leaching test

In all sample and mixture sample, no heavy metals exceeded the reference value.

(unit:mg/l、N.D.: Non-Detected)


Conclusions

PS(sandy soil)

・Additive amount of plaster have a small effect

・Plaster (60 kg/㎥ and 100 kg/㎥) on the 28th day is as

strong as cement on the 7th day

PA(Ariake cray)

・Moisture content have a small effect

・Moisture content has a very large effect

① Mechanical property

Conclusions

PC(cohesive soil)

・ Solidification material function

・Strength increases as material age length


Chemical property

Conclusions

Affirmation of chemical stability

The mechanical and chemical properties

Solidification material is available by additive amount of recycle plaster and moisture content of soil

② Chemical property

No heavy metals exceeded

the referencevalue.


E

End


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