Research on the influence of fineness and content of lithium slag on the performance of cement mortar

Abstract

Lithium slag(LS) is industrial solid waste during the production of lithium carbonate. LS has pozzolanic effect and replace cement to achieve the purpose of protecting the environment and saving resources. In order to clarify the influence of fineness and content of LS on the performance of cement mortar. The effects of different fineness and content of LS powder on the workability, mechanical properties and microscopic properties of cement mortar were studied. The results shown that the grinding time refined the particle size of LS and increased the particle content in the range of 0.95μm~5.68μm. Fineness of LS had little effect on the workability and mechanical properties of cement mortar. Excessive LS had significant negative impact on workability and mechanical properties of cement mortar. When the content of LS was 10 %, the heat release, the production of Ca(OH)2 and ettringite of cement paste increased. Early mechanical property of cement mortar was unreduced and effectively improved later mechanical properties under this content. The research can provide data support for the application of LS in practical engineering.