Over the last few years the Texas Department of Transportation has expressed concern about mineralogical segregation (variation) of coarse aggregates used in bituminous mixes; problems are associated with variation in the quality of aggregates taken from a quarry/gravel pit. The primary objective of this project was to examine the effects of poor quality coarse limestone aggregate on hotmix asp...

Limestone is widely used in the construction industry to produce Portland limestone cement (PLC) concrete. Systematic evaluations of hydration kinetics, compressive strength development, and carbonation resistance are crucial for the rational use of limestone. This study presents a hydration-based model for evaluating the influences of limestone on the strength and carbonation of concrete. Firs...

Cement-based materials are fundamental resources used to in construction. The increase in requests for and consumption of cement products, especially in Iran, indicates that more cement plants should be equipped. This study developed a geographical information system using pairwise comparison based on grey numbers to identify potential sites in which to set up cement plants. A group of five exp...

Coal mining has played an important role in the history of West Virginia’s economy, but it is also cause a major environmental issue called acid mine drainage (AMD). AMD caused by heavy metals from abandoned mines running into waterways and soils. concern because many areas affected flow larger water sources that are used for drinking recreation. This problem individuals unknowingly consuming g...

The conditions of the open pit drainage are usually very complex and, as a rule, insufficiently researched. When it comes to exploitation technical stone, especially limestone, working environment is characterized by crack porosity, and present system cracks faults, apart from being in relationship with each other, greater or lesser water permeability function size openings, type material which...

In this work we have tested the fluidized bed desulfurization performance of lime particles obtained by means of a proprietary limestone slow calcination pre-treatment technique. This performance was compared to that of the parent untreated limestone particles. The occurrence of particle fragmentation and attrition during the fluidized bed operation was also investigated with a specific test pr...

Acid mine drainage (AMD) from abandoned mines has significantly impaired water quality in eastern Kentucky. A small surface flow wetland constructed in 1989 .: to reduce AMD effects and subsequently failed after six months of operation was :‘ renovated by incorporating anoxic limestone drains (ALDs) and anaerobic subsurface drains promoting vertical flow through successive alkalinity producing ...

It happened in Hungary several times that a limestone quarry opened the entrance of new, unknown cave during its activity such as case was Villány Mountains, Budapest, and Kesel?, Naszály or Esztramos Hills. is right natural caves are protected, but what solution cases? Closing mine? Absolving from protection? difficult question. The real way: we must weigh. Which more expensive? How valuable u...

A study was conducted to determine the effect of different limestone particle sizes in layer diets on bone quality characteristics at end-of-lay hens. Calcitic limestone (360 g Ca/kg DM) that is extensively used in commercial poultry diets was obtained from a specific South African source. Limestone particles were graded as small (<1.0 mm), medium (1.0 2.0 mm) and large (2.0 3.8 mm) and include...