Properties of Self-Compacting Cementitious Composite Materials Containing Cement Kiln Dust Powder

This paper aims to investigate the influence of utilization micro cement kiln dust as a sustainable materials additive in order to reduce the voids and micro cracks in the cementitious mortar materials which cause a drastic reduction in the load carrying capacity of the element. Its therefore very important to decrease the pores and enhance the mechanical strength of the cementitious composite materials. In this article, the properties of self-compacting mortar containing micro cement dust additive was experimentally assessed. Micro cement dust powder was added to the self-compacting mortar in (1, 2, 3, 4 and 5 %) percentage by weight of cement to be used as cementitious sustainable materials. The experimental results indicated that the modification and enhancement of the workability of fresh mixture and the mechanical strengths of self-compacting mortar were increased as micro cement dust additives increases. Also; the water absorption and total porosity were decreased with increases of micro cement dust powder.

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CEMENT KILN DUST IN AN ALL-CONCENTRATE DIET FOR FEEDLOT STEERS

Canadian Journal of Animal Science ◽

10.4141/cjas79-090 ◽

1979 ◽

Vol 59 (4) ◽

pp. 699-705 ◽

Cited By ~ 1

Author(s):

G. W. MATHISON ◽

J. R. THOMPSON

Keyword(s):

Significant Interaction ◽

Control Diet ◽

Weight Basis ◽

Cement Kiln Dust ◽

Control Group ◽

Cement Kiln ◽

Cement Dust ◽

Feedlot Steers ◽

Wet Weight ◽

Kiln Dust

Two groups of 16 steers were fed an all-concentrate diet with or without 3.5% cement kiln dust for 125 days. There were no differences (P > 0.05) in overall animal performance between the two experimental groups. Steers fed the cement dust diet and the control diet gained an average of 1.12 and 1.24 kg/day, respectively. Both groups of cattle ate an average of 9.2 kg of feed daily. There was a significant interaction (P < 0.05) between diet and length of time on feed; the cattle which were fed cement kiln dust ate slightly more than the control group in the first two thirds of the experiment and less in the last third of the experiment. Rate of liveweight gain was also lower (P < 0.05) in the cattle fed cement kiln dust in the last third of the experiment. Lead concentrations in kidney tissues were significantly higher (P < 0.01) in the steers fed the cement kiln dust (0.80 mg/kg, wet weight basis) than in the steers fed the control diet (0.36 mg/kg, wet weight basis). The diets had no significant (P > 0.05) effect on lead concentrations in muscle tissue, blood or liver.

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Effects of cement-kiln dust pollution on the vegetation and seed-bank species diversity in the eastern desert of Egypt

Environmental Conservation ◽

10.1017/s0376892900038868 ◽

1996 ◽

Vol 23 (3) ◽

pp. 249-258 ◽

Cited By ~ 13

Author(s):

Ahmad K. Hegazy

Keyword(s):

Species Diversity ◽

Seed Bank ◽

Life Forms ◽

Seed Rain ◽

Cement Kiln Dust ◽

Cement Kiln ◽

Cement Dust ◽

Dust Pollution ◽

Standing Vegetation ◽

Kiln Dust

SummaryThere is very little information on effects of particulate pollution from cement factories in the Middle East and northeastern Africa. Variations of natural vegetation, germinable soil seed bank and species diversity were therefore investigated amongst four study sites situated at different distances from the Suez Cement Company factory, south of Suez, Egypt. The composition of plant life-forms was similar in both vegetation and seed-bank communities, with only site-dependent differences in their proportional values. For the standing vegetation, chamaephytes attained the highest relative density and cover, while hemicryptophytes and geophytes exhibited the lowest values. Germinable soil seed bank of all life-forms tended to increase with distance from the cement-dust pollution source. Vegetation, seed rain and seed banks of hemicryptophytes and geophytes were the most affected by cement-kiln dust accumulation in the area. The ratios of seed-bank/seed-rain in all life-forms were less than unity, with a narrow range of variation amongst sites and species. The germinable seed bank was more affected by cement-kiln dust accumulation than the seed rain in all species and life-forms. The species diversity of perennial plants was greater than that of annuals, with values increasing as distance increased from the cement-dust pollution source. Diversity in the standing vegetation Was higher than that of the germinable seed bank. Differences in the standing vegetation and seed-bank reserves were observed in the different study sites. According to their response to cement-dust accumulation, the plant species (listed in text) in the study area were separated into four major groups: (1) tolerant species; (2) non-tolerant species; (3) species having intermediate tolerance; and (4) indifferent species. Management considerations for the conservation of vegetation in cement quarrying sites and around cement factories were put forward to optimize recovery and restoration of vegetation in sites polluted by cement dust.

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