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Polymer concrete


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Polymer concrete

  1. 1. Polymer Concrete
  2. 2. Polymer Concrete The porosity due to air-voids, water voids or due to the inherent porosity of gel structure itself. On account of the porosity, the strength of concrete is naturally reduced. It is conceived by many research workers that reduction of porosity results in increase of strength of concrete. Therefore, process like vibration, pressure application spinning etc., have been practiced mainly to reduce porosity. All these methods have been found to be helpful to a great extent, but none of these methods could really help to reduce the water voids and the inherent porosity of gel, which is estimated to be about 28%. The impregnation of monomer and subsequent polymerization is the latest technique adopted to reduce the inherent porosity of the concrete, to improve the strength and other properties of concrete
  3. 3. 1. Polymer Impregnated Concrete (PIC). 2. Polymer Cement Concrete (PCC). 3. Polymer Concrete (PC). Type of Polymer Concrete
  4. 4. Polymer impregnated concrete is one of the widely used polymer composite. It is nothing but a precast conventional concrete, cured and dried in oven, or by dielectric heating from which the air in the open cell is removed by vacuum. Then a low viscosity monomer is diffused through the open cell and polymerized by using radiation, application of heat or by chemical initiation Polymer Impregnated Concrete (PIC)
  5. 5. Methyl methacrylate (MMA) Styrene Acrylonitrile T-Butyl styrene Monomers
  6. 6. Polymer cement concrete is made by mixing cement, aggregates, water and monomer. Such plastic mixture is cast in moulds, cured, dried and polymerized. The monomers that are used in PCC are: (a) Polyster-styrene. (b) Epoxy-styrene. (c) Furans. (d) Vinylidene Chloride. Polymer Cement Concrete (PCC)
  7. 7. Polymer concrete is an aggregate bound with a polymer binder instead of Portland cement as in conventional concrete. The main technique in producing PC is to minimize void volume in the aggregate mass so as to reduce the quantity of polymer needed for binding the aggregates. This is achieved by properly grading and mixing the aggregates to attain the maximum density and minimum void volume. The graded aggregates are prepacked and vibrated in a moulds. Monomer is then diffused up through the aggregates and polymerization is initiated by radiation or chemical means. A Silone coupling agent is added to the monomer to improve the bond strength between the polymer and the aggregate. In case polyester resins are used no polymerization is required. Polymer Concrete (PC)
  8. 8. Stress-Strain Relationship Compressive Strength Tensile Strength Flexural Strength Creep Shrinking Durability Properties of Polymer Impregnated Concrete
  9. 9. PIC has a nearly linear stress-strain relationship to failure. There is very little departure from linearity up to 90% of ultimate strength and there is no abrupt change at the proportional limit. The stress strain curves for Styrene-TMPTMA impregnated concrete also show the same characteristics as for MMA impregnated concrete. The modulus of elasticity increased from 27 GPa for impregnated specimen to 49 GPa for MMA impregnated specimens. Stress-Strain Relationship
  10. 10. The effect of polymer loading on the compressive strength in PIC Using methyl methacrylate as monomer and with a polymer loading of 6.4%, strength of the order of 144 Mpa (thermal catalytic process was 130 Mpa) have been obtained using radiation technique of polymerization. The control specimen had compressive strength of 38 MPa Compressive Strength & Tensile Strength
  11. 11. Polymer impregnated concrete with polymer loading of 5.6% MMA and polymerized by radiation have shown flexural strength 3.6 times more than that of the control specimen, i.e. the flexural strength was increased to 18.8 MPa from 5.2 MPa. Compressive Creep deformation of MMA impregnated concrete and styrene— impregnated concrete has been observed to be in direction opposite to that of the applied load i.e., Negative Creep. After the typical initial movement during load application, these concretes expand under sustained compression Flexural Strength & Creep
  12. 12. Freeze Thaw Resistance Polymer impregnated concrete has shown excellent resistance to freeze-thaw MMA impregnated and radiation polymerized specimens have withstood 8110 cycles of freeze-thaw compared to 740 cycles in case of unimpregnated concrete. Even partially impregnated concrete withstood 2310 cycles. Resistance to Sulphate Attack it has been observed that there is at least 200% improvement in the resistance of polymer impregnated concrete and 89% improvement in the case of partially impregnated concrete over the conventional concrete. Durability
  13. 13. Acid Resistance The acid resistance of PIC has been observed to improve by 1200% when exposed to 15% HCI for 1395 days. Water Absorption A maximum reduction of 95% in water absorption has been observed with concrete containing 5.9% polymer loading Durability