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1.1 What is stabilization? A process in which small quantities of additive(s) is used and added to the existing materials which can significantly improve the normal engineering properties of soils, crushed rocks and gravels e.g. CBR, permeability and strength etc.. . 1.2 How to carry out stabilization? * Usually carry out in-situ * Sometimes in a centralized processing plant 1 STABILIZATION Soil Soil + Cement Soil+Cement+Polymer 1

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1.3 Advantages * Minimal use of chemical * Efficient & rapid construction * Reduced energy consumption * Environmentally sound * Existing materials can be used * Reduces susceptibility to water * Well proven process 1 STABILIZATION (Cont.#1) 2

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2.1 What is GeoStab Polymer ? * A water soluble white milky viscous liquid which is neutral, non-toxic, and non-hazardous. * Chemically, a proprietary polymer-based mixture dispersed in water * An Australian developed technology * A world-wide patent pending product 2 POLYMER 3 Other physical properties are :

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2.2 What polymer is used * A proprietary polymer mixture for use in soil-stabilization * An additive to improve the performance of cement soil-stabilization through modification of their properties * Enhance modulus of elasticity, flexibility, strength characteristics and durability * Based upon more than 60years of proven soil-cement stabilization application technology * Experience confirms it to be a superior modifier of soil-stabilization 2 POLYMER (Cont.#1) 4

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2.3 Modification of soil- stabilization by Polymer * Cyclic load (repetitive & reversal) from traffic caused fatigue failures in pavement * Above factors are rapidly rendering conventional soil-stabilization less suitable today * Conventional soil-stabilization susceptible to sulphate attack and proven inappropriate for clayey soils containing excessive fines(> 35% passing the No. 200 sieve) and of high plasticity (P.I. > 10) * All these suggest modification to original soil-stabilization technology is necessary in order to meet critical actual needs of pavements today * Laboratory tests, full-scale pavement test and in-service pavements have confirmed the suitability of GeoStab as a modifier of soil-cement stabilization technology to not only meet but actually greatly exceed the requirements of pavement stabilization today and into the foreseeable future 2 POLYMER (Cont.#2) 5

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2.4 How Does the Polymer modify Soil-Stabilization? * Increase modulus of elasticity through connecting cement-coated soil particles by what can by described as numerous ‘micro rubber bands’ * The water-holding nature is useful during curing process * Protect soil-stabilization against harmful effects of chemical compounds in soil, e.g. sulphate * Prevent penetration and capillary rise of water within soil-stabilization * Reduce the effects of moisture migration – a major cause of pavement deterioration * Encapsulates items that would normally be considered harmful to concrete 2 POLYMER (Cont.#3) 6

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2 POLYMER (Cont.#4) 7 Polymer “micro rubberbands” Soil particles Cement Soil particles Harmful chemicals Polymer Coating

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Shortage of water in conventional soil stabilization during curing 2 POLYMER (Cont.#5) 8 PC-Soils overcome water shortage problem during curing Soil Cement Base course Cracks ! Polymer water storage No Cracks !

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2 POLYMER (Cont.#6) 9 Free capillary rise of water Blocked capillary rise of water Soil-Cement Surface Micro pores PC-SoilsSurface Capillary action (bleed) in Normal Soil-Cement Reduced bleeding in Polymer Concrete Soils

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2.5 What is polymer modified soil-cement ? Adding 5% GeoStab™ 101 Polymer (by weight of cement) will produce a mixture on site which upon compaction and curing will harden to give an impermeable durable structural concrete slab with high elastic modulus & flexibility and at the same time possesses improved compressive and tensile strength characteristics to resist today’s critical load conditions experience by pavements. Polymer Concrete Soils - Acronym “PC-SOILS” 2 POLYMER (Cont.#7) 10 = PC-Soils

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STEPS FOR CONSTRUCTION OF Polymer Concrete ROAD PAVEMENT 3 START LABORATORY SOIL TESTING * SITE INVESTIGATION& SOIL SAMPLINGS RESULTS DESIGN ** CONSTRUCTION FINISH NO PEAT PEAT * Soil Test Required : 1.Natural Moisture Content 2.Grain Size Distribution 3.Atterberg Limits 4.Sulphate Content 5.Organic Content 6.Compaction Test (Modified Proctor Method) 7.Durability Test 8.Compression Strength Test ** Design Method Used : Equivalent Thickness Method (TA) - Pavement Design END 11 PEAT = Organic Matter

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ROAD CONSTRUCTION PROCEDURE BY RECYCLING MACHINE 5 14 Step 1 : Mark the stabilized area Step 2 : Load GeoStab™ mixture and Portland cement as designed ratio into the soil stabilizer machine Step 3 : Run the soil stabilizer machine over the existing base material Step 4 : Mix the existing material with cement and GeoStab™ mixture to the designed thickness

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ROAD CONSTRUCTION PROCEDURE BY RECYCLING MACHINE (Cont.#1) 5 15 Step 5 : Compact the stabilized area by the roller compactors to the required CBR Step 6 : Cure the GeoStab™ base with water if required Step 7 : The GeoStab™ surface after completed Step 8 : Density test by sand replacement

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ROAD CONSTRUCTION PROCEDURE BY GRADER MACHINE 6 16 Step 1 : Grading the constructing area Step 2 : Putting the suitable volume of cement Step 3 : Spread the Portland cement all over the surface Step 4 : Mixing soil and cement properly

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ROAD CONSTRUCTION PROCEDURE BY GRADER MACHINE (Cont.#1) 6 17 Step 5 : Spray the mixture of GeoStab™ and water. Step 6 : Mix GeoStab™and Water to Soil-Cement Properly. Step 7 : Smoothing the surface by grader and compacting the road. Step 8 : The GeoStab™ road surface 1 day after construction.

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ROAD CONSTRUCTION PROCEDURE BY MIXING PLANT 7 18 Step 1 : Sub-grade appearance after completely leveling and compacting. Step 2 : Mixing GeoStab™ with water at mixing plant. Step 3 : Dumpers are waiting for Ready-mixed GeoStab™ from the continuous mixing plant. Step 4 : Ready-mixed GeoStab™ flow onto Dumper.

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ROAD CONSTRUCTION PROCEDURE BY MIXING PLANT (Cont.#1) 7 19 Step 5 : Pour the blend from Dumper to Paver. Step 6 : Paving the GeoStab™-soil-cement by Paver. Step 7 : Compacted by vibrating roller compactor. Step 8 : Surface appearance of second layer after curing.

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CONCLUSIONS 7 20 Polymer modified soil-cement (or Polymer Concrete Soils “PC-Soils”) build upon a well proven soil stabilization process. In essence, it is a mixture of pulverized soil, GeoStab™ admixture, cement and water which when compact, cure and harden will turn into a durable structural material as a Polymer Concrete. A change in today’s traffic loading conditions as compared to previous; notably high traffic volume and heavy axle load have rendered modification of the conventional soil-cement most necessary, if not a must. The technique is appropriate for new pavement construction, pavement rehabilitation and recycling works for maintenance.

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CONCLUSIONS (Cont.#1) 7 21 By optimizing and improving the engineering properties and performance (e.g. Load carrying capacity, elastic modulus and thus fatigue resistance and permeability and thus dimensional stability) of; local materials available on site (e.g. Soil, crushed rocks and gravel) so that they can be efficient, economical and durable this method lessen and/or totally removes the dependence and reliance on outside imported quarry products and/or borrowed soil materials during pavement construction. Consequently, it represents not only a time saving solution but also an environmental sustainable & friendly construction and maintenance approach.

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CONCLUSIONS (Cont.#2) 7 22 Although partial mechanization, a more affordable method, is suitable for less trafficked rural roads or construction in remote areas, full mechanization is preferred in the construction of major highways and runways or the like structures where better homogeneity is achieved through more efficient mixing process and also higher and more predictable output capacity are realizable. In brief, effective PC-Soils stabilization treatment can be achieved without the requirement of specialized stabilization or recycling equipment, high level of engineering know-how, or an understanding of materials and quality systems. However for more critical applications such as motorways, highways and runways, all these are necessary to ensure that desired design outcomes are achieved.

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PROJECT REFERENCE Acapulco Highway, Mexico 24 8

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PROJECT REFERENCE Bicycle Track ,Thailand 25 8

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PROJECT REFERENCE Car Parking, Thailand 25 8

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PROJECT REFERENCE Highway No.1003, Thailand 26 8

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PROJECT REFERENCE Rehabilitation Road ,Bangkok 27 8

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PROJECT REFERENCE Farm Entrance Road, Malaysia 28 8

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PROJECT REFERENCE Road Construction ,GHANA 29 8


Tags: stablization geostab geological polymer concrete

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