Abstract
This study compares the performance of perlite with that of conventional additives in blended cements. The results of the application of Perlite Powder (PP) as a component of blended cements in two different proportions (30% and 50%) are presented and compared with standard additives of fly ash (FA) and Ground Granulated Blast Furnace Slag (GGBFS). Moreover, perlite is tested as a component of ternary cement (70% cement, 15% P and 15% FA and GGBFS alternatively). Blended cements are tested in terms of flexural strength, compressive strength, bulk density, water absorption, and frost resistance. The results show that although perlite blended cements achieve lower strengths and higher absorptivity compared to conventional additives, they have significant potential for freezing and thawing durability, especially in ternary combination with GGBFS. For practical applications, the intrinsic values of the parameters of the individual binders with perlite (e.g. flexural strength of 4.1–6.2MPa or compressive strength of 18.8–38.5MPa) are sufficient for many practical applications. Perlite, when suitably combined with other pozzolanic materials, can be a suitable component of blended binders.
Highlights
Cement is a material consisting of ordinary concrete, and of various types of cement composites
This study presents the results of the application of perlite as a component of blended cement in two different proportions, and compares it with standard additives (FA and Ground Granulated Blast Furnace Slag (GGBFS)) in the same amounts
The evaluation of the results is mainly focused on samples with perlite, both against the reference sample and samples with conventional additives of GGBFS and Fly Ash (FA)
Summary
Cement is a material consisting of ordinary concrete, and of various types of cement composites. Nowadays, when sustainability principles, including the CO2 footprint, have to be taken into account, other SCMs should be researched. These include raw materials, like micro-powder limestone, metakaolin [1], zeolite [2], rice husk ash [3], tile powder [4], perlite, etc. Each of these materials has to undergo preproduction testing before being used as an SCM in concrete. The technical properties (mechanical, rheology, durability and thermo-insulation) and the economic and environmental parameters of these SCMs must be assessed [5]
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