Concrete a composite material made from cement, water, fine aggregate and coarse aggregate. But present researchers are in interest of finding new cement materials by waste materials or waste products produced from industries which are harmful to environment. The present paper deals with partial replacement of cement with quarry dust and metakaolin which are having silica used as admixture for ...

Truck and shovel are the most common raw material transportation system used in the cement quarry operations. One of the major challenges associated with the cement quarry operations is the efficient allocation of truck and shovel to the mining faces. In order to minimize the truck and shovel operating cost, subject to quantity and quality constraints, the mixed integer linear programing (MILP)...

Fiber reinforced concrete is a composite material consisting of mixtures of cement, fine aggregate, coarse aggregate and fibers. The fiber reinforced concrete exhibits better fatigue strength and increased static and dynamic tensile strength and compressive strength. In this project, the strength of fiber reinforced concrete was investigated partial replacement of cement with rice husk ash and ...

OBJECTIVE to identify the association between the exposure of workers to inorganic dust in a quarry and a cement factory and pulmonary diseases. METHODS a transverse study on data from 32 quarry workers (QWs) and 57 cement production line workers (CFWs) to inorganic-dust exposure was performed. Pulmonary function tests and chest X ray were done in both groups. RESULTS there were differences...

In this study, the researchers investigated the potential use of locally available waste materials from the lime stone quarry and the granite industry as a partial replacement of cement. Quarry sites and granite industry in the eastern province of Saudi Arabia produces tons of powder wastes in the form of quarry dust (QD) and granite sludge (GS), respectively, causing serious environmental prob...

In this note we deal with a practical problem arising at ENCI Netherlands BV. ENCI is a major producer of cement. Its factory site is located south of Maastricht where an important ingredient of cement, marl, is digged from a quarry. The following situation occurs at the site of ENCI. There are different kinds of traac on the site and the vehicles of each kind of traac follow a xed route on the...

In 1978 a study of the mortality of United States cement plant and quarry workers was initiated. The vital status of a cohort of 5292 men who had been employed for at least five years in a cement plant between 1950 and 1980 was traced to 1 January 1980. The mortality experience was evaluated for 4231 white men for whom complete work histories and demographic information were available. Deaths f...

OBJECTIVES Cement contains hexavalent chromium, which is a human carcinogen. However, its effect on cancer seems inconclusive in epidemiologic studies. The aim of this retrospective cohort study was to elucidate the association between dust exposure in the cement industry and cancer occurrence. METHODS The cohorts consisted of male workers in 6 Portland cement factories in Korea. Study subjec...

Abstract Peat soil is one of the types available in Malaysia, which has a high compressibility and low shear strength. Thus, peat considered inappropriate to support construction site its natural state. Among methods suitable for stabilization using cement. However, quantity cement required quite large made this method not too environmentally friendly due carbon dioxide, CO 2 emission from prod...