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No. water Composition (arbitrary WI- Properties compressive . units) portland zeo1ite* cement The properties of the products were measured after 12 hours moist curing at 85° C. Zeolite-based lightweight concrete . products can also be produced by steam curing. The com 50 pressivestrengthofsteamcuredproductsislowerthanthat by autoclave curing in EX PLE7 This example illustrates the use of chemical admixtures in 55 productionoflightweightconcreteproductstoincreasetheir strength. The test results are shown in the following table: Properties Composition(arbitrarywt.units) compressive 11 12 *Zeolite in this test was from Western Canada. No. 1 zeolite had 72.6% particleslargerthan0.175mm and5.5%particleslargerthan0.295mm; No. Properties 2 zeolite had 15.3% particles larger than 0.175 mm. com Thepropertiesoftheproductsweremeasuredafter28days Cornposition(arbitrarywt.units) portland silica zeo1ite* cement lime sand water (kg/m3) (MPa) 3.5 1 0.27 1.35 2.21 1461 26.9 10 *Zeolite in this test was from Western Canada and calcined at 800° C. for 2 hours.Ithad 15.3%particleslargerthan0.175mm. The zeolite was pre-treated at high temperature. The zeolite lost its ability of generating air bubbles after the high temperature calcination due to its decomposition. The cal cinationtreatmentappearedtoincreasethepozzolanicactiv ity of zeolite. The concrete product made with such a zeolite hadhighcompressivestrengthafterautoclavecuringat178° C.for3hours.Thisproductcanbeusedashighload-bearing material for wall units and roof slabs. EXAMPLE 5 20 This example illustrates the use of zeolites to produce lightweight low cost concrete products cured at normal temperature for other applications including blended 25 masonry cement, land?ll lining, soil strengthening, etc. The test results are shown in the following table: 1 3 1 2.0 1216 19.0 3 1 2.1 985 24.5 bulk pressive hydration at 23° C. in moisture. It is clear that zeolite-based lightweight concrete products can also be produced using normal-temperature curing. A suf?cient strength and low bulk density can be obtained at 28 days. The product made by zeolites containing more ?ne particles had higher com— pressive strength and lower bulk density. This material can be used as masonry cement, grouting cement or other applications where long-term moisture curing is available. EXAMPLE 6 This example illustrates the use of zeolite to produce lightweightconcreteproductsproducedbysteam-curingfor use in construction. The test results are shown in the followingtable: density strength bulkdensity (kg/m3) (MPa) 5,494,513 Composition(arbitrarywt.units) portland silica No. zeolite* cement lime sand water (kg/m3) strength (MPa) 1 3.6 1 0.27 1.35 2.31 1306 10.8 2 3.6 1 0.27 1.35 2.31 1321 11.3 3 3.6 1 0.27 1.35 2.54 1126 2.5 4 3.6 1 0.27 1.35 2.76 1300 12.1 *Zteolites in tests No. l-3 were from Western Canada. The zeolite was calcined at 800° C. for 2 hours in test No. 2 and itwas calcined at 550° C. for 2 hours in test No. 3. The zeolite in test No. 4 was also from Western Canada but from a di?'erent location. The particle size of the zeolite used here had 15.3% particles larger than 0.175 mm. strength . portland silica bulkdensity strength No. zeolite* cement lime sand admixture water (kg/m3) (MPa) 1 3.6 1 0.27 1.35 - 2.31 1306 10.8 2 3.6 1 0.27 1.35 Na¢SO4 2.31 1268 18.2 bulkdensity Properties compressivePDF Image | ZEOLITE-BASED LIGHTWEIGHT CONCRETE PRODUCTS
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