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Composition(arbitrarywt.units) Properties compressive 5,494,513 9 10 portland silica silica bulkdensity No. zeolite* cement lime ?our sand water (kg/m3) strength (MPa) 1 2 l — -—~ — 1.32 490 0.37 2 2 l — — 0.3 1.32 500 1.80 3 2 l 0.27 1.15 — 1.41 560 2.60 *ZeoliteinthistestwasfromGreenhrae,CA,USA andcalcinedat550°C.for2hours‘TheZeolite intestNo.1had72.6%particleslargerthan0.175mm and5.5%particleslargerthan0.295mm. The Zeolite in test No. 2 and 3 had 15.3% particles larger than 0.175 mm. The Zeolite used in this test was quite pure and able to 15 generate a large amount of air bubbles. The coarse Zeolite ... Prti resultedinlowerdensityandstrengthintheproducts.The aerated concrete products made by this Zeolite had low value of bulk density and compressive strength after autoclave '° 20 cunngat178 C'for3hours. EXAMPLE 2 . . This example illustrates the use of calcined Zeolite (500° Composition(arbitraryW1’units) portland silica rope es mm. bulk Pressive density strength . . zeolite* cement lime sand water (kg/m3) (MPa) 3.5 1 0.27 1.35 2.79 1210 14.4 *Zeolite in this test was from Western Canada. and not pre-treated. It had C.)toproduceaeratedconcreteproductshavinglowdensity andhighstrengthforuseasloadbearingwallmaterialfor25 15.3%particleslargerthan0.175mm. construction.Theeffectofsilica?our,silicasandandZeolite particle size are also demonstrated. The test results are shown in following table: The Zeolite was not calcined. Since itshigh surface area required more water to satisfy the workability requirement, the concrete made by natural zeolite stil had low bulk Composition (arbitrary wt. units) _ portland silica No. zeolite* cement lime sand PVA water (kg/m3) strength (MPa) 1 3.5 1 0.4 _ _ 2.21 925 2 3.5 1 0.4 0.43 0.93 2.21 1051 10.3 3 3.5 1 0.27 — 0.80 2.21 1231 16.4 43.510.27_0.802.21960 4.9 5 2.0 1 _ _ _ 1.28 700 7.3 *Zeolites in test No. l-4 were from Western Canada, and calcined at 500° C. for 2 hours. Particle size:No. land2Zeolitehave 15.3%particleslargerthan0.175mm; No.3zeolitehas 15.1%particles largerthan0.075mm;No.4Zeolitehas72.6%particleslargerthan0.175mm and5.5%particles larger than 0.295 mm. Zeolite in test No. 5 was from Greeuhrae, CA, USA, and calcined at 550° C. for 2 hours. Ithad 15.3% particles larger than 0.175 mm. The Zeolite used in this test had lower purity and generated lessairbubblesthantheZeoliteusedinexample 1.Thebulk density of the concrete after autoclave curing at 178° C. for 3 hours was much higher than that of the concrete in 50 _ _ example 1eventhoughtheZeolitecontentinthiscasewas d?nslty after autoclav? Curing at 178° C- for 3 hours- The compressivestrengthoftheconcreteproductwashigherdue manufacture. EXAMPLE 4 This example illustrates the use of high temperature calcined Zeolite to produce lightweight concrete products having high strength for use in heavy load bearing wall _ _ construction and roof unit manufacture. The test results are shown in the following table: bulkdensity Properties compressive higher. Correspondingly higher compressive strength was obtained. The addition of silica ?our and silica sand in the No. 2 mixture apparently increases the compressive strength anddensityTheZeolitecontainingCoarseparticles(N04) 55 canbeused1nwallandconstructlonforroo?ngmaterial resulted in a lower bulk density and strength in aerated concrete products than the ?ne Zeolite (No. 3) due to the particle size effect discussed above. Zeolite in test No.5 pflducedlowerdensityproductthanthoseusedintestNo. 60 EXAMPLE 3 This example illustrates the use of natural Zeolite to producehighstrengthlightweightconcreteproductsforuse 65 in wall construction and for roo?ng maten-als for Construc_ tion. The test results are shown in the following table: 7.6 to the high pozzolanic activity of the Zeolite. This product ___PDF Image | ZEOLITE-BASED LIGHTWEIGHT CONCRETE PRODUCTS
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