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13 14 -continued Composition(arbitrarywt.units) portland silica No. zeo1ite* cement lime sand admixture water glma) (MPa) 0.23 3 3.6 1 0.27 1.35 Na2NO-3 2.31 1319 17.0 0.23 4 3.6 1 0.27 1.35 SMF 1.92 1376 21.1 0.03 *Zeolites in this test was from Western Canada. The particles size distribution of the zeolite had 15.3% particles larger than 0.175 mm. 15 The properties of the products were measured after 12 hours mo'lst'cunng at 850 C‘ The Strength °_fzeohte'based hght' we1ght concrete products can be s1gm?cantly enhanced by adding sodium sulphate and sodium nitrate, or by adding superplasticizer (sodium sulfonated melamine forrnalde- hyde). EXAMPLE 8 This example illustrates the production of low cost light weightconcreteproductsmadebyzeolite,lime,sandanda small amount of chemical admixture for use in construction and soil strengthening. The test results are shown in the followingtable: lightweight concrete products to prevent cracks due to dryingshrinkage.Thetestresultsareshowninthefollowing tb1_ Composition(arbitrarywt.units) bulkdensity No. zeolite* sand lime NaQSO4 water (kg/m3) strength (MPa) 7.3 *Zeolites in this test were from Western Canada. The particle size distribution of the zeolite had 15.3% particles larger than 0.175 mm. The properties of the products in test No. 1 and 2 were Composition(arbitrarywt.unitsj 1 1 0.37 0.15 — 0.75 1257 1 0.37 0.15 0.06 0.75 1333 11.9 3 1 _ 0.20 0.71 1028 9.7 portland No. zeo1ite* cement 1 3.6 1 2 3.6 l 3 3.6 l 4 3.6 1 Properties drying bulk compressive sodium zeolite lime sulfate aggregate wollastonite water (%) (kg/m3) (MPa) 5,494,513 Properties compressive bulkdensity strength a 6' 20 25 Properties compressive 0.27 — 6.9 — 2.92 0.02 0.27 0.23 6.9 — 2.92 0.03 0.27 0.23 —— 0.70 2.31 0.06 0.27 0.23 -— 0.92 2.31 0.07 1305 11.1 1336 15.6 1290 14.1 1329 16.1 *Zeolite in this test was from Western Canada. The particle size distribution of the zeolite had 15.3% particles larger than 0.175 mm. Thesizeofzeoliteaggregateis2-6mm indiameter. measured after 12 hours moist-curing at 85° C. The strength of zeolite-based lightweight concrete products can be enhanced about 63% by adding sodium sulphate. The prop erties of the products in test No. 3 were measured after 28 days moist-curing at 23° C. EXAMPLE 9 65 This example illustrates the use of crushed zeolite aggre gateandthemineraladmixturewollastoniteinproductionof 60 Thepropertiesoftheproductsinthetestsweremeasured after 12 hours moist-curing at 85° C. The addition of wollastonitedidnotreducethetotaldryingshrinkageofthe products. It was concluded on the basis of optical micros copy however that the number of microcracks on the surface of the products was reduced. shinkage density strengthPDF Image | ZEOLITE-BASED LIGHTWEIGHT CONCRETE PRODUCTS
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