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Wednesday, 16 October 2019
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Raw materials & technologies, Applications

Preparing polymer-modified mortar with styrene-acrylic copolymer

Thursday, 9 October 2014

Chinese researchers prepared a new polymer-modified waterproof mortar using steel slag, iron tailings and fly ash as aggregates.

A core-shell styrene-acrylic copolymer was used as mortar modifier. Source: Nicole Kaiser/Fotolia

A core-shell styrene-acrylic copolymer was used as mortar modifier. Source: Nicole Kaiser/Fotolia

Using Poly(styrene-co-hydroxyethyl methacrylate) (P(St-co-HEMA)) microsphere with a core-shell structure as the modifier, a new polymer-modified waterproof mortar was developed with steel slag, iron tailings and fly ash as aggregates. Effects of cement-aggregate ratio, polymer-cement ratio and defoamer-cement ratio on performances of this mortar were investigated.

Mortar gave better mechanical properties

The factor design was used to determine the optimal conditions: polymer-cement ratio, 12 wt.%; cement-aggregate ratio, 1:2.5; defoamer-cement ratio, 0.8 wt.%. The product conformed to Chinese norms. Furthermore, the mortar with P(St-co-HEMA) as the modifier gave better mechanical properties and water resistance compared to those with commercial ethylene-vinyl acetate copolymer (EVA) and styrene-acrylic copolymer (SAE) as modifiers. Microstructures of these polymer-modified mortars were compared and discussed. The results showed, that mortar gave better mechanical properties and water resistance compared to those with commercial EVA and SAE as modifier.

The study is published in: Construction and Building Materials, Volume 72, 15 December 2014, Pages 15-22.

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