L'utilisation des résidus des mines d'amiante comme granulats dans les bétons

1978 ◽  
Vol 5 (4) ◽  
pp. 557-571
Author(s):  
Michel Pigeon
Keyword(s):  
Cement Paste ◽  
Quebec City ◽  
Concrete Aggregates ◽  
City Area ◽  
Complete Study ◽  
Solid Part ◽  
Asbestos Tailings

Preliminary studies having shown that it is possible to use the solid part of various asbestos tailings as concrete aggregates, a complete study of two tailings considered particularly suitable for this purpose was undertaken. The dust was first removed from the tailings, and these were submitted to the usual tests (absorption, sulfate soundness, etc.). The tailings were then used to make concretes that were later compared to concretes made with normal aggregates from the Quebec City area. These tests showed that the tailings could be used as aggregates, but that the quantity of cement paste required to obtain a given slump was much higher than that of normal mixes. The making of concrete with asbestos tailings as aggregates was thus found to be uneconomical. The concrete s made with the tailings were also found to be much more deform able than normal concretes. [Journal translation]

scholarly journals Seroprevalence of Antibodies against Human Herpesvirus 6 in the Quebec City Area

1992 ◽  
Vol 3 (4) ◽  
pp. 179-184 ◽  
Author(s):  
Louise Deschênes ◽  
Jean R Joly ◽  
Michel Couillard ◽  
Gilles Richer
Keyword(s):  
Cell Line ◽  
Antibody Titre ◽  
Geometric Mean ◽  
Human Herpesvirus ◽  
Quebec City ◽  
Age Group ◽  
Human Herpesvirus 6 ◽  
Serum Samples ◽  
City Area ◽  
Herpesvirus 6

Seroprevalence of antibodies against human herpesvirus 6 was determined in a sample of 303 randomly selected individuals from the Quebec City area. The influence of different variables on antibody litres was also evaluated. Human herpesvirus 6 was grown in the HSB-2 cell line, and antibody litres were measured by indirect immunofluorescence. Serum samples were collected from 177 females and 126 males ranging in age from two months to 88 years. Ninety-nine per cent (300 of 303) of this population had an antibody titre of at least 1:10, whereas 75% had a titre of at least 1:80. Women had a higher geometric mean litre than men (P=0.06). This difference between sexes varied according to age and became statistically significant in subjects older than 20 years of age (P=0.04). It was found that this difference was attributable to higher antibody litres in women in the 15 to 40 year age group who had previously had children.

scholarly journals Feasibility of Recycled Concrete in Pavements with Demolished Building Waste in UAE

2019 ◽  
Vol 8 (3) ◽  
pp. 5773-5778
Keyword(s):  
Cement Paste ◽  
Experimental Research ◽  
Commercial Buildings ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Construction Waste ◽  
Concrete Aggregates ◽  
Natural Aggregate ◽  
Natural Aggregates ◽  
Growing Population

The growing population has increased the demand for residential and commercial buildings. As a result of demolition of these buildings, lot of construction waste is generated. Most of these waste are non-biodegradable. When put into landfills, these waste pollute the land and harm the environment. Therefore, need of recycling these materials and using them is necessary. Concrete aggregates from demolished buildings can be reused to make concrete. However, its strength is immensely affected due to cement paste and mortar attached to it. Experimental research was carried out to determine how strengths of concrete made of natural aggregate, rejected concrete batch aggregate, aggregate from 8 years and 16 years old demolished buildings vary and also the feasibility of each. Different ratios of each type of recycled aggregates were taken along with the natural aggregates to determine how strength varies with change in ratio.

A trace fossil preserving its producer (Trentonia shegiriana) from the Trenton Limestone of the Quebec City area

1978 ◽  
Vol 15 (4) ◽  
pp. 659-664 ◽  
Author(s):  
R. K. Pickerill ◽  
W. H. Forbes
Keyword(s):  
Shallow Water ◽  
Trace Fossil ◽  
Quebec City ◽  
Water Interface ◽  
City Area ◽  
Subtidal Environment ◽  
Water Depths

The Trenton Limestone of the Quebec City area contains a moderately abundant and diverse ichnofauna including numerous simple trails that formed at the sediment–water interface. A rare specimen of one of these trails demonstrates that its producer was an errant polychaete annelid, Trentonia shegiriana gen. et sp. nov. It is suggested that T. shegiriana or a morphologically similar errant polychaete annelid was responsible for the production of not only the trails described herein but also the ichnospecies Walcottia rugose. Faunal, ichnofaunal and sedimentological evidence suggests that T. shegiriana inhabited a shallow water subtidal environment with water depths in the order of 10 m or less and preferred a calcisiltite substrate. In the absence of T. shegiriana these simple trails can therefore be utilized as useful palaeoenvironmental indicators.

scholarly journals Emergence of a new turfgrass insect pest on golf courses in Quebec, the European crane fly [Diptera: Tipulidae]

2006 ◽  
Vol 87 (1) ◽  
pp. 43-45 ◽  
Author(s):  
Louis Simard ◽  
Jacques Brodeur ◽  
Jon Gelhaus ◽  
Élisabeth Taschereau ◽  
Julie Dionne
Keyword(s):  
Insect Pest ◽  
First Record ◽  
Golf Course ◽  
Quebec City ◽  
Golf Courses ◽  
City Area ◽  
Climatic Regions ◽  
Large Populations ◽  
Fly Larvae

Abstract A survey of European crane fly occurrence was performed in 2002 on 18 golf courses from different climatic regions of Quebec, Canada. At each golf course, the scouting was done weekly from early May to mid-October on three greens and three fairways using a grid and a golf course hole cutter, respectively. The European crane fly (Tipula paludosa), a major turfgrass insect pest, was identified on two golf courses in the Quebec City area. This is the first record of this species in Quebec. These European crane fly larvae were observed from mid-May to the end of August, and adults were detected from late August to mid-September. The European crane fly was found to be a pest on the two golf courses and insecticide applications were used to control the large populations of this insect.

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