Effect of micro-sized lead oxide on the workability, mechanical strength and durability of alkali-activated slag mortar

This is the first attempt to investigate the effect of micro-sized lead oxide (mPbO) on the properties of alkaliactivated slag (AAS) mortars. Various ratios of mPbO ranging from 2.5 wt% to 10 wt% were added to the neat AAS mortar specimens. The variation in the workability, mechanical strength development, transport properties and accelerated aging resistance were investigated. The available advanced devices were used to analyze the results. The results indicated a positive effect of mPbO on the flowability of the mixtures. The addition of mPbO increased the mechanical strength and the resistance of accelerated aging, where 7.5% was the optimal. A higher ratio of mPbO than 7.5% (i.e 10%) did not show additional improvement, but an adverse effect was observed compared to that of 7.5% mPbO. The transport properties and accelerated aging resistance were improved with the addition of 2.5-7.5% mPbO, but slightly worsen with the addition of 10% mPbO compared to that of 7.5% mPbO. The microstructure was improved and refined with the addition of suitable ratios of mPbO.

Automated summary

This study is the first attempt to investigate the effect of micro-sized lead oxide (mPbO) on the properties of alkali-activated slag (AAS) mortars. Different ratios of mPbO were added to the AAS mortar specimens, and the workability, mechanical strength development, transport properties, and accelerated aging resistance were analyzed. The results showed that the addition of mPbO improved the flowability, mechanical strength, and resistance to accelerated aging, with 7.5% mPbO being the optimal ratio. Higher ratios of mPbO did not provide additional improvements and had adverse effects. The transport properties and aging resistance were improved with 2.5-7.5% mPbO, but slightly worsened with 10% mPbO. The microstructure was improved with suitable ratios of mPbO.