A bench work study was carried out to investigate the use of kaolinitic clay containing 29.4% Al2O3 extremely abundant in Saudi Arabia for the production of pure alumina by calcination at 700 o C for 1h (recommended by previous investigators) then leached by hydrochloric acid. The effects of leaching temperature (25 o C to boiling temperature), period of activation (10-150 minutes), acid concen...

This study investigated the effects of layered clay on the thermal curing behavior and tensile properties of resole phenol-formaldehyde (PF) resin/clay/cellulose nanocomposites. The thermal curing behavior of the nanocomposite was characterized using conventional differential scanning calorimetry (DSC) and temperature modulated (TMDSC). The addition of clay was found to accelerate resin curing,...

The most used bricks in house building NDjamena, city of Chad which is situated semi dry arid area with 600 millimeters pluviometry per year and 50 °C as highest temperature, are raw clay bricks, terracotta or ciment block. have strong sensibility water weak resistance to compression. cement block high thermal conductivity contrary the adobe their manufacturingcontribute destroy environment. a...

The use of clay materials for the production of emulsion paints was investigated. Two types of clay: White tinged with Purple and Smooth clay (WSP) and Grey Brown and Coarse clay (GBC), were used for the production of Emulsion Clay Paints (ECP). Conventional Chemical pigmented Paint (CP) was also produced as a control. Atomic Absorption Spectroscopy, (AAS) was used to determine the chemical com...

Water contamination with dyes is harmful to humans and the environment. This study investigated photocatalytic activity of natural clay (GOL) mixed carbon nanotubes (CNT) for removal brilliant black (BB) in wastewater. The materials were characterized FESEM-EDS, XRD, XRF, FTIR UV-vis DRS. contains 2.34 % TiO2 which 75% more than most clays. SEM showed that CNT well dispersed clay. DRS spectra t...

Plant metabolic activity in arid and semi-arid environments is largely tied to episodic precipitation events or ‘‘pulses’’. The ability of plants to take up and utilize rain pulses during the growing season in these water-limited ecosystems is determined in part by pulse timing, intensity and amount, and by hydrological properties of the soil that translate precipitation into plant-available so...

A large amount of granite sludge waste (GSW) is produced during the quarry processing that has a negative impact on environment. The main aim this study to investigate possibility partial replacement brick clay by GSW and silica fume (SF) due similarity mineralogical composition clay. Five different series SF proportions were tried, which (70:5:25), (70:10:20), (70:15:15), (70:20:10), (70:25:5)...

Many termite species use clay to build foraging galleries and mound-nests. In some cases clay is placed within excavations of their wooden food, such as living trees or timber in buildings; however the purpose for this clay is unclear. We tested the hypotheses that termites can identify load bearing wood, and that they use clay to provide mechanical support of the load and thus allow them to ea...