Durability of the Reinforced One-Part Alkali-Activated Slag Mortars with Different Fibers

Z Abdollahnejad,M Mastali,M Illikainen,M Falah,T Luukkonen,K Mohammad Shaad

doi:10.1007/s12649-020-00958-x

Z Abdollahnejad, M Mastali + Show 4 more

Open Access

https://doi.org/10.1007/s12649-020-00958-x

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Abstract

This paper investigates the effects of reinforcing one-part alkali-activated slag binders (OAASs) with different types of fiber (steel, polyvinyl alcohol [PVA], basalt, and cellulose) and fiber combinations (single and hybrid) on the mechanical and durability properties of OAASs. All OAASs were reinforced by a 1% fiber volume fraction. Compressive and flexural strengths were the mechanical properties, which were addressed. The durability of the reinforced OAASs was examined based on water absorption by immersion and capillary, acid resistance, high temperature resistance, carbonation resistance, and freeze/thaw resistance. The experimental results showed that the fiber type and combination greatly affects the mechanical and durability properties of OAASs. Moreover, the influence of fiber type and combination on high temperature resistance and freeze/thaw resistance is greater than the influence on acid resistance and carbonation resistance.Graphic

Highlights

The growth of global construction has contributed to the increase in the amount of ordinary Portland cement (OPC) concretes
Alkali-activated materials with variable raw material availabilities, hydration reactions, costs, and CO2 emissions due to production have been proposed as alternatives to OPC-based concretes, showing acceptable mechanical and durability properties as well as lower environmental impacts [2]
The greatest increases and decreases in the ultrasonic pulse velocity (UPV) in relation to the reference mixture were observed in the one-part alkali-activated slag binders (OAASs) reinforced by

Summary

Introduction

The growth of global construction has contributed to the increase in the amount of ordinary Portland cement (OPC) concretes. The production of OPC-based concretes and transportation of raw materials results in significant CO2 emissions into the atmosphere. Cement contributes more CO2 emissions than other components in OPC-based concretes [1]. Alkali-activated materials with variable raw material availabilities, hydration reactions, costs, and CO2 emissions due to production have been proposed as alternatives to OPC-based concretes, showing acceptable mechanical and durability properties as well as lower environmental impacts [2]. Some researches have made efforts to replace aqueous alkali activators with solid activators [8,9,10]. These alkali-activated binders are called one-part alkali-activated materials, and they have various advantages over conventional alkali-activated materials with aqueous alkali solutions, which are called two-part alkali-activated materials

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