Definition. A deleterious gene is one that virtually all reasonable individuals “would judge consistently to cause very premature death or serious health problems that drastically compromise the capacity” of afflicted individuals to carry out normal or near-normal life plans.

Allele frequency refers to how common an allele is in a population. It is determined by counting how many times the allele appears in the population then dividing by the total number of copies of the gene. The gene pool of a population consists of all the copies of all the genes in that population.

: harmful often in a subtle or unexpected way deleterious effects deleterious to health.

If something is deleterious, it does harm or makes things worse. Smoking has obvious deleterious effects on your health, not to mention your social life. My parents were worried that their divorce would have a deleterious effect on us kids, but in the end it was less harmful than watching them fight all the time.

Deleterious materials (also known as prohibited materials) are materials that are prohibited for use in a project. This could be for a variety of reasons including: structural stability/performance/physical integrity/life-expectancy of a project. non-compliance with regulations. susceptibility to change/deterioration.

Asbestos – Asbestos is the most written about deleterious material; Please see our other blogs for information on asbestos hazards and management.

Wood wool: Slabs are often used as permanent formwork and left as a ceiling soffit. This may result in reduced fire resistance, reinforcement corrosion or in extreme cases, loss of structural strength in its use as a permanent shuttering or formwork.

Deleterious materials and highly undesirable constituents. Adverse effects of deleterious materials on concrete includes the increase of water demand in concrete, impair bond strength between cement and aggregate, reduce durability, result in concrete popouts, and impair wear resistance.

For most concrete structures, the curing period at temperatures above 5º C (40º F) should be a minimum of 7 days or until 70% of the specified compressive or flexural strength is attained. The period can be reduced to 3 days if high early strength concrete is used and the temperature is above 10º C (50º F).

In normal concrete work, the maximum compressive strength that can possibly be obtained is generally reckoned to be about 7,500 psi for a 28-day cylinder.

Explanation: Workability of concrete can be improved by more cement and water with proper water cement ratio. At the more workable end of this group, concrete may be manually compacted in roads using aggregate of rounded or irregular shape.

Definition of ‘workability’ The workability of a substance, especially a metal, is how easily it can be changed into a new shape. The workability of a substance, especially a metal, is how easily it can be changed into a new shape.

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Measurement of Workability”. 1. Explanation: Work ability of concrete is measured by slump cone test, compaction factor test. Slump cone is used for medium work ability. For high work abilities it is not accurate.

In case of a shear slump, the slump value is measured as the difference in height between the height of the mould and the average value of the subsidence.