Composites Based on Alternative Raw Materials at High Temperature Conditions

• DOI: 10.3311/ppci.9820
• Publication Date: 2017-06-15T20:41:23Z
• Authors: Tomáš Melichar; Jiří Bydžovský; Ámos Dufka
• Keywords: popílek; polymer-cement; density; agloporite; pevnost; malta; přídržnost; vysokopecní struska; 02 engineering and technology; bond; reziduální vlastnosti; agloporit; blast furnace slag; zvýšené teploty; fly ash; elevated temperature; objemová hmotnost; mortar; rapid cooling; residual properties; rychlé chlazení; strength; 0210 nano-technology

This paper presents newly developed polymer-cement composites.The primary binder (cement) was partially substituted byuse of blast-furnace slag and high-temperature fly ash. A lightweightaggregate – agloporite (grain size in range 1–2 mm) wasused among other components. porous aggregate is producedfrom energy by-products (fly ash). Attention focusedon the behavior composites when exposed to elevatedtemperatures (400 °C–1,000°C). The influence several differentmethods temperature decrease assessed slow(in furnace 1°C/min) rapid (laboratory ambient 22°C andwater bath 18°C). Specific dimensional changes were determined,including strength characteristics bulk density.Structural deterioration microstructural selectedspecimens investigated by analytical techniques (SEM andCT). Compressive bending tensile changed variouslydepending on changes, including severalcooling conditions. Deterioration reactions (especially cracks)which formed composite structures correspondedwith results physico-mechanical testing. That wasconfirmed using CT SEM.The fact that has a positive effect thermalresistance wasproved. Almost no cracks or failures identified (byusing SEM) interfacial transition zones agloporiteafter thermal stress. indicates very good bond adhesionbetween matrix aggregates during extremetemperature conditions (in case different cooling methods).