Effects of different levels of compost application on the amounts and percentage distribution of organic N forms in whole soils and particle size fractions were investigated. Soil samples were collected from three plots: a) F, only chemical fertilizers; b) F + LC, chemical fertilizers plus low level of compost; (c) F + HC, chemical fertilizers plus high level of compost. Each soil sample was di...

In this paper, the influence of cement and some selected admixtures: redispersible polymer powder, airentraining and hydrophobing agents, on the hydrophobicity of cured renovation plaster was analysed. The results were obtained experimentally. The result of capillary action (H) over a given period of time was used to evaluate the hydrophobicity of these materials. Statistical methods based on m...

In the modern construction practices, industrial wastes or by-products are largely used as raw materials in cement and concrete. These impart many benefits to the environment and bringabout an economic impact because the cost of waste disposal is constantly increasing due to strict environmental regulations. It was reported in literature that the leakage of oil onto concrete element in older ce...

<p>Permanent damages and spalling occur in conventional concrete due to high temperatures. Also loses its compressive strength amounting about 50 75% of the original as reported most research works. As opting for grade leads higher costs emits CO2, an attempt develop thermal-resistant geopolymer is done. A new class silica-alumina binders called geopolymers has ability withstand Generally...

The practical use of recycled concrete aggregate produced by crushing concrete waste reduces the consumption of natural aggregate and the amount of concrete waste that ends up in landfills. This study investigated two methods used in the production of fine recycled concrete aggregate: (1) a method that produces fine as well as coarse aggregate, and (2) a method that produces only fine aggregate...

Today concrete is most widely used construction material due to its good compressive strengt h and durability. Depending upon the nature of work the cement, fine aggregate, coarse aggregate and water are mixed in specific proportions to produce plain concrete. Plain concrete needs congenial atmosphere by providing moisture for a minimum period of 28 days for good hydration and to attain desired...