Building Materials
The basic purpose of a retarder in concrete is

To increase the initial setting time of cement paste in concrete
To improve the workability of concrete mix
To decrease the initial setting time of cement paste in concrete
To render the concrete more water tight

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Building Materials
The plywood

Has good strength along the panel only
Has greater impact resistance to blows than ordinary wood
Can be spilt in the plane of the panel
Cannot be bent more easily than ordinary wood of same thickness

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