This paper presents the results of consolidated and undrained (CU) triaxial cyclic tests related to influence tire waste addition on strength characteristics two different soils from Southern Poland: unswelling kaolin swelling red clay. The test procedure included normally remolded specimens prepared pure clay (RC) (K) their mixtures with fractions shredded rubber powder (P) granulate (G) in 5%...

Earthen construction represents almost 30% of the housing in developing countries, partially because its low cost compared to steel and concrete construction, also raw materials are available everywhere. One biggest disadvantages earthen is lack information variety on their constitutive materials, specifically soil type. This work addresses physical mechanical properties adobe matrices containi...

Despite occurring in a wide variety of taxa, deliberate soil consumption (geophagy) is a poorly understood behavior. In humans, geophagy is sometimes considered aberrant or a sign of metabolic dysfunction. However, geophagy is normally assigned an adaptive function in nonhuman primates and various other organisms. One hypothesis submits that clay-rich soil adsorbs intestinal insults, namely pla...

The presence of clay-sized particles and clay minerals in modern sands and ancient sandstones has long presented an interesting problem, because primary depositional processes tend to lead to physical separation of fineand coarse-grained materials. Numerous processes have been invoked to explain the common presence of clay minerals in sandstones, including infiltration, the codeposition of floc...

Column experiments were conducted to study chemical factors that influence the release of clay (kaolinite and quartz minerals) from saturated Ottawa sand of different sizes (710,360, and 240 microm). A relatively minor enhancement of clay release occurred when the pH was increased (5.8 to 10) or the ionic strength (IS) was decreased to deionized (DI) water. In contrast, clay release was dramati...

The erosion threshold, beyond which bed sediments start to move, is a key parameter describing sediment transport processes. For silt-dominated mixtures, in the grain size between sand and clay, existing experimental studies exhibit contradictory observations. That is, was either sand-like or clay-like, suggesting transitional behavior. To explore underlying mechanism of behavior silt-sized sed...

In the paper some results on the effects of chemo-physical evolution of clay-lime-water suspensions on the microstructure of a lime treated kaolin have been presented. A multi-scale investigation on the sedimentation behaviour of clay suspensions under different pore water chemistry has been developed highlighting the chemophysical mechanisms controlling particle arrangement and the soil fabric...

BACKGROUND Although geophagia (earth eating) has been observed and documented in many areas of the world, the specific preference for consuming kaolin is less well known. The ingestion of kaolin, also known as white dirt, chalk, or white clay, is a relatively common type of pica found in the central Georgia Piedmont area. METHODS We reviewed the literature, made informal contacts with Georgia...

Klebsiella pneumoniae H12 produced a newly identified extracellular polysaccharide in an ethanol medium with a yield of 3.0 g/l. The molar composition of the polysaccharide was 56.04% galactose, 25.92% glucose, 10.92% galacturonic acid, 3.71% mannose, and 3.37% glucuronic acid. The addition of 0.5%-1.5% NaCl increased production. The polysaccharide flocculated with kaolin clay in suspension at ...