Calcium oxide

About: Calcium oxide is a research topic. Over the lifetime, 7600 publications have been published within this topic receiving 66104 citations. The topic is also known as: caustic lime & quicklime.

An introduction to lime stabilisation

Abstract: An outline is given of the history of the use of lime stabilisation which has been used extensively in the UK since the late 1980s. Quicklime has several advantages over hydrated lime in the UK. The effect of lime on clay and silt soils is explained and the mechanism of lime stabilisation is discussed. Consideration is given to the reaction of sulphate with cementitious materials causing heaving. The improvement and modification of clay soils with lime stabilisation is outlined. As the strength and cohesion of the soil is enhanced by stabilisation, it is possible to improve soils prone to movement by settlement or swelling so that they can be used in structural applications. Examples are given of the situations where stabilisation of soils can be made on economic and technical merit. Future opportunities are outlined. For the covering abstract see IRRD 887532.

Calcium glyceroxides formed in the System of calcium oxide‐glycerol. With 4 figures

Abstract: Four crystalline glyceroxides, that is, CaC3H6O3, Ca(C3H7O3)2, Ca3(C3H7O3)6 · (C3H8O3)2 and Ca(C3H7O3)2 · (C3H8O3)4 were found in the system of calcium oxide-glycerol in the temperature range from 10deg;C to 150°C. Phase equilibrium, solubilities, optical data, X-ray data, IR-spectroscopic data as well as data on thermal decomposition of each crystalline compounds are included. Im System CaO-Glycerin wurden zwischen 10 und 150°C vier kristalline Calciumderivate des Glycerins (Formeln s. Summary) aufgefunden und durch ihre Phasengleichgewichte, Loslichkeiten, optischen Eigenschaften, Rontgenpulverdaten, IR-Spektren und thermische Zersetzung charakterisiert.

Carbonation of lime and cement stabilized layers in road construction

Abstract: The problem of deterioration of lime, lime-slag and cement stabilized pavement layers during curing, before sealing and in service is partly ascribed to carbonation of the stabilizer during curing and subsequent exposure to the atmosphere before sealing. The surface disintegration problem can be prevented by better construction practices. However, the long term durability of cementation appears to be in question and further research is urgently needed. (Author/TRRL)

Diffusion and diffuse cementation in lime and cement stabilised clayey soils - chemical aspects

Abstract: Quantitative measurements were made of the diffusion of lime into unpulverised clay lumps in lime and cement stabilised mixtures of a heavy montmorillonitic clay soil. Lime/clay reaction products, both within lumps and within the initially stabiliser-rich matrices, were analysed. Interpreted in the light of earlier findings the chemical analyses reveal the striking efficiency with which even 0.5 per cent lime could alter the physical properties of this soil. The analyses show that montmorillonite was the exclusive reactant with lime, and further, that montmorrillonite reacted almost exclusively at crystal edges. The analyses show why diffuse cementation so effectively utilises such small quantities of lime: not only are products strategically placed, but their extensive development at any location is unlikely while nearly clay remains unreacted. A phenomenon similar to the adsorption of lime postulated by diamond and kinter was demonstrated; but it was concluded to be associated with only extremely ready availability of lime, and therefore to be of rather lesser significance than anticipated by diamond and kinter. However, it possibly could be prejudicial to the most uniform development of diffuse cementation: to guard against its occurrence, coarsely pulverised mixtures might be best stabilised with coarsely ground lime. /Author/ /TRRL/