(i) Resin content does not have much effect on compressive strength. (ii) Temperature rise was observed for frequency range of 200–400 Hz. (iii) Addition of 1% silane agent increases the load for withstanding 2 million cycles from 59% to 64% of ultimate strength.
Crushed quartzite, siliceous sand, and calcium carbonate
Resin type, silane treatment, and microfiller addition
Compressive strength, flexural strength, and split tensile strength
(i) Epoxy concrete has much superior properties than the polyester concrete. (ii) Compressive strength goes up by 30% for the polyester concrete and 36% for the epoxy concrete by incorporation of a silane coupling agent. (iii) The compressive and flexural strengths of the polyester concrete are greatly improved on incorporation of the microfiller.
Temperature, strain rate, void content, method of preparation, and resin content
Compressive strength, flexural strength
(i) Maximum flexural and compression modulus are observed between 14 and 16% resin content by weight. (ii) Strain rate was found to have very limited effect on the flexural behaviour. (iii) Compaction moulding was found to have better results than vibration moulding.
Resin content, silane treatment, compaction, and glass fiber content
Compressive strength, flexural strength, and split tensile strength
(i) Maximum compressive and flexural strength were reported at 14% resin content. (ii) Addition of glass fibers increases the flexural strength, compressive strength. (iii) Silane treatment increases the flexural strength by 25%.
Temperature, strain rate, aggregate type, and curing conditions
Compressive strength, split tensile strength
(i) Compressive strength increases with curing temperature. (ii) Maximum strength was obtained for one-day room temperature curing followed by one-day curing at 80°C. (iii) Use of gap graded aggregate resulted in highest compressive strength.
Curing conditions, silane treatment, and rate of loading
Compressive strength, tensile strength, and stress strain relationship
(i) Maximum compressive strength was obtained for a resin content of 15%. (ii) 1-day room temperature curing followed by 1-day curing at 80°C increased the compressive strength by around 50% as compared to 2-day curing at room temperature. (iii) Compressive strength and modulus increase with increase in strain rate. (iv) Silane treatment of aggregate increases the compressive strength by around 14%.
Granite aggregate confirming to ASTM mesh No-5–50, river sand, and fly ash
Fly ash and river sand contents have been varied in full range of 0–100% of fine aggregate to study the replacement of river sand with fly ash
Flexural strength
(i) Fine aggregates in combination with fly ash and river sand show synergism in strength behaviour and resistance to water absorption up to the level of 75% by weight of fly ash. (ii) At the higher level of fly ash, properties decline as the mix becomes unworkable due to the fact that pure fly ash, because of large surface area, does not mix with resin binder effectively.
(i) Maximum compressive strength was achieved at 12% resin content for all types of resins. (ii) Highest modulus of rupture was also obtained at 12% resin content, which was almost 3 times that of cement concrete.
Resin content, microfiller content, mixing method, and type of sand
Three-point bend tests on specimens of mm
(i) Best results were obtained for 20% resin content. (ii) Clean sand gives better properties with low resin content as foundry sand has high specific surface.
Resin content, microfiller content, type of sand, and curing cycle (7 days at 23°C and 3 hrs at 80°C)
Three-point bend tests on specimens of mm
(i) Curing cycle of 3 hrs at 80°C gives almost the same results as 7 days at 23°C curing. (ii) Epoxy resin gives better properties with foundry sand as aggregate, whereas polyester gives better properties with clean sand because of the higher capacity of epoxy to wet the aggregates.
Pea gravel as coarse aggregate and sand as fine aggregate, fly ash
Fly ash content
Compressive strength
(i) Replacing 15% by weight of sand with fly ash results in 30% increase in compressive strength. (ii) Caution should, however, be exercised when using a relatively high loading of fly ash, because the high surface area of the material would make the mix become too sticky and thus unworkable.
River gravel of 0–4 mm size and 4–8 mm size, silica fume (SUF)
Resin content, microfiller content
Compressive strength, flexural strength, and split tensile strength
(i) Compressive strength varies from 43.4 to 65.3 MPa and flexural strength varies from 12.29 to 17.5 MPa. (ii) Resin content of 15.6% was found suitable for almost all the properties of polymer concrete.
Gravel of 2–4 mm, gravel to sand ratio of 0.25 used for optimum packing density
Resin content, curing conditions
Compressive strength, flexural strength
(i) Maximum compressive strength and flexural strength were reported for a resin content of 13%. (ii) Maximum compressive and flexural strength were obtained after 3 days of curing.
Mix composition based upon maximum bulk density, curing conditions, and water content of aggregates
Compressive strength
(i) The following optimum mix proportion has been suggested: 11.25% resin, 11.25% calcium carbonate, 29.1% andesite (5–20 mm), 9.6% sand (1.2–5 mm), 38.8% sand (<1.2 mm). (ii) Compressive strength becomes constant after 7-days curing at 20°C. (iii) Strength reduces with increases in water content of aggregate; maximum water content shall be limited to 0.1%.
(i) Authors proposed an optimized mix based upon their study as that containing 10% resin, 45% pea gravel, 32% sand, and 13% fly ash. (ii) Polymer concrete achieves 80% of its strength after curing of one day, when compared to seven-day curing period.
(i) The polymer concrete bed had large damping factors over wide frequency range. (ii) Damping factors found experimentally were higher than those for steel structure and cast iron.
(i) Damping loss factor of polymer concrete is 65% higher than that of cast iron. (ii) Polymer concrete maintains its damping over a large frequency range.
Use of recycled fillers, that is, powdered rubber, tyre rubber, and so forth
Damping, loss modulus
(i) Addition of powdered rubber, tyre rubber, and so forth increases damping over wide temperature. (ii) Polymer concrete containing organic fillers can be used for making machine tool bases.
(i) Damping of polyester concrete is four to seven times higher than that of cast iron. (ii) Damping characteristics were not much influenced by mix composition.
