Létt steypuaukefni | Afkastamikil froðuefni fyrir frumusteypu
Foam concrete is a cellular lightweight concrete, manufactured from cement, sand or fly ash and water in combination with a foaming agent. It is used for a wide variety of applications including thermal insulation, bulk filling and structural elements.
Mix proportions of foamed concrete are determined by the requirements of the given site and the materials used for required workability, plastic density and compressive strength. The dry density of the resulting product depends on the saturation level in its pores, which can range from 300 til 1600 kg/m3 depending on the type of sand or fly ash used for base materials and the amount of foam added for additional workability.
The ratio of the sand or fly ash to portland cement should be kept between 1:3 og 2:1 fyrir léttsteypu með þéttleika undir 600kg/m3. Til framleiðslu á þyngri frauðsteypu með þéttleika sem er meiri en 1500 kg/m3, meira magn af sandi er venjulega notað sem grunnefni.
Nokkrir þættir hafa áhrif á örbyggingu léttsteypu (FC). Svitaholastærðardreifingin, vökvavörurnar og skellaga uppbygging svitahola eru allar mikilvægar breytur sem hafa áhrif á þrýstistyrk FC.
Mikill fjöldi alþjóðlegra bókmennta um FC hefur verið gefinn út. Þó mikið af því fjalli um stórsæja þætti frumuléttsteypu, rannsóknir á örbyggingu þess eru ekki vanræktar.
Í þessari rannsókn, fjöldi mismunandi blönduhönnunar var útbúinn með því að breyta hlutföllum sements og sands. A renowned and commercially available foaming agent was used to produce air-entrained concrete. The mixture was then molded into different shapes. The compressive strength of these mixes was tested at various ages. The results showed that the compressive strength of these mix designs varied from 2.8 til 6.14 MPa og 28 daga.