Assessment of the Possibility of Using Chalcedonite Powder as a Component of Mortars

Abstract

The article presents the results of the assessment of the possibility of using chalcedonite powder as a partial replacement for cement in mortars. Portland cement CEM I 42.5 R was used as a binder, which was replaced in the amount of 5%, 20%, 35% and 50% with chalcedonite powder. The experimental tests concerned the determination of the technological and mechanical properties of mortars: consistency, air content, compressive and bending strength, supplemented by X-ray diffraction analysis and calorimetric measurements of the pastes. The research results indicate that chalcedonite powder can be used in the production of mortars. The best mechanical properties of tested mortars were obtained in the case of replacing cement with the addition of powder in the amount of 5% and 20%.

Physico-Mechanical Properties and Hydration Processes of Cement Pastes Modified with Pumice, Trass and Waste Chalcedonite Powder

“…The addition of waste chalcedonite powder in three-component pastes resulted in their slight thickening. The results of this research are consistent with the conclusions from publication [ 15 ], but opposite to the results from publication [ 33 ].…”

“…Significant topics in cement production include not only the reduction of environmental pollution or reduction of emissions of CO 2 but also the protection of the natural environment through the use of waste materials [ 1 , 2 , 4 , 13 , 14 , 15 ]. Siliceous fly ash, granulated blast furnace slag and limestone powder are the most popular non-clinker raw materials [ 1 , 5 ].…”

“…A good idea in the production of Portland cement with additions and low-clinker cements is the use of waste stone powders such as granite, marble, basalt or chalcedonite powder [ 15 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Abdelaziz M.A.…”

“…Water absorption for modified concretes was obtained in the range from 4.2% to 4.9%. In publication [ 15 ], cement mortars were modified with chalcedonite powder in amounts of 5%, 20%, 35% and 50%. Using this material in the range from 5% to 35% reduced compressive strength by a maximum of about 31% after 28 days and by a maximum of about 38% compared to reference concretes.…”

Parameters of Concrete Modified with Micronized Chalcedonite

“…Utilizing billions of tons of waste material fits into the protection of the natural environment [28,29]. Using the accumulated amounts of waste material would allow less clinker consumption, reduce emissions of air and soil pollutants, save natural raw materials, clean up the areas around the mines, and protect people living in the near vicinity from respiratory diseases [30][31][32].…”