The effects of accelerated aging on a pigmented elastomer were evaluated by using a weathering chamber. Silastic 44210, a maxillofacial material with proven color and physical property stability, was chosen for pigmentation with 11 maxillofacial pigments. The values of ultimate tensile strength, maximum percent elongation, shear strength, Shore A hardness, and permanent deformation were determi...

In this study, we investigated the color, gloss and surface roughness of bamboo (Phyllostachys bambusoides) and Scots pine (Pinus sylvestris) samples impregnated with boron and copper based preservatives during accelerated weathering from 168 h to 672 h. Tanalith-E, ACQ, wolmanit-CB were used as copper-based chemicals, while a mixture of boric acid and borax (7:3; w/w) was used as the boron com...

UNLABELLED Bacteria play important roles in mineral weathering, soil formation, and element cycling. However, little is known about the interaction between silicate minerals and rhizobia. In this study, Rhizobium yantingense H66 (a novel mineral-weathering rhizobium) and Rhizobium etli CFN42 were compared with respect to potash feldspar weathering, mineral surface adsorption, and metabolic acti...

Plastic debris in Earth's oceans presents a serious environmental issue because breakdown by chemical weathering and mechanical erosion is minimal at sea. Following deposition on beaches, plastic materials are exposed to UV radiation and physical processes controlled by wind, current, wave and tide action. Plastic particles from Kauai's beaches were sampled to determine relationships between co...

Pothole formation and development may be influenced by joint sets and other heterogeneities within bedrock, as well as by hydraulics. Previous research indicates that most potholes found in rivers of the mountainous Spanish Central System exhibit preferred orientations associated with dominant joints and correlate more strongly with variations in substrate resistance than with hydraulics. Weath...

. introduction weathering is crushing, decomposition and decaying the rocks of outer earth's crust by natural processes such as; running waters, wind blowing and ice creeping and biological actions and so on. the study of weathering is important because this process lead to formation of all known of soil types in outer part of earth crust finally. climate is the most important parameter in crea...

Abstract Soft rocks can weather and lose their structure within a short time due to drying out rewetting. Thus they are very sensitive weathering. Since these often found in the shallow subsurface, of great practical relevance foundation constructions. The rock properties change during weathering process. Particularly relevant is softening material decrease its mechanical properties, which dete...

In this study, the purpose was to improve outdoor performance of cement bonded wood composite due their biodegradation and sensitivity moisture especially in warm humid climates. Cement composites were treated with different concentrations (10 %, 25 50 75 % 100 %) water repellent. Water repellent used an organo-silicon based, nano-sized, eco-friendly, water-based agents. Dipping pressure system...

Allanite and epidote occur in the parent rocks of weathered regolith at the Coweeta Hydrologic Laborato~y in North Carolina and exhibit different responses to weathering. Petrographically, epidote and allanite are identical at Coweeta, and only with additional analytical techniques (e.g., EDS or LAICP-MS) can the two be distinguished. Allanite is more abundant in unweathered bedrock but weather...

Introduction: We present evidence suggesting that the spectral slope of airless bodies in the UVvisible wavelength range can be used as an indicator of exposure to space weathering. While space weathering generally produces a reddening of spectra in the visible-NIR spectral regions, it tends to result in a bluing of the UV-visible portion of the spectrum, and may in some cases produce a spectra...