Question
Download Solution PDFSuperplasticisers are also called ________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF|
Admixtures |
Functions |
Typical compounds |
Application |
Disadvantages |
|
Water-reducing retarders |
Increased workability and delayed setting |
Mixtures of sugars or hydroxylated carboxylic acids and lignosulfonate. |
Water reducer, with slower loss of workability. |
|
|
Plasticizers (water reducers)-8 to 15 percent water reduction |
Higher flowability |
Hydroxylated carboxylic acid derivatives Calcium and sodium lignosulfonates. |
1. Higher workability with strength unchanged. 2. Higher strength with workability unchanged. 3. Less cement for same strength and workability. |
Certain special types of cements like sulphate resistant cement (low C3A content) and expansive cement do not perform well. |
|
Superplasticizers (Super-water reducers) – 15 to 30 per cent water reduction |
Greatly enhanced workability. |
Sulfonated Melamine formaldehyde resin, sulfonated naphthalene-formaldehyde resin, Mixtures of saccharates and acid amides. |
1. Water reducer, but over a wider range. 2. Facilitate production of flowing or self-leveling concrete |
1. Tendency to segregate. 2. Flowability is not long lasting. 3. During hot weather the workability retention period decreases fast. |
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