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Use of Polymers and Precast Concrete - Lesson Summary

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The key points from this module are as follows:

- Polymers are used in concrete production in three major forms: directly as the binder to replace Portland cement; as an impregnating agent to enhance the properties of Portland cement; as an admixture in concrete resulting in polymer-modified concrete.
- The applications of polymer concrete are: patch repair works in highways; fast-curing, high-strength patching of structures; in areas that are subject to chemical attack; in repair works, where thin sections are required.
- The reasons for concrete compaction are as follows: Compaction results in the highest possible density of concrete by removing voids; It has the effect of fluidifying the mortar component of the mix so that internal friction is reduced and packing of coarse aggregate takes place; It increases the abrasion resistance and general durability of the concrete, decreases permeability, and helps to minimise its shrinkage and creep characteristics; It has a direct impact on achieving the specified surface finish.