Evaluation of the pozzolanic activity of red ceramic waste using mechanical and physicochemical methods

Abstract

Alternative cementitious materials can potentially reduce the environmental impact of the extraction of lime and the hazardous production of Portland cement. Red ceramic waste can be comminuted to fine particles with both filler and pozzolanic activity and used in Portland and lime mortars. This study presents the evaluation of the pozzolanic activity of red ceramic waste by physicochemical and mechanical methods using Portland cement and lime mortars. The evaluated waste depicted high pozzolanic activity and absence of Na2O, and consumed 32% of CaO according to the adapted Chapelle test. The compressive strength recorded in the pozzolanic activity test with lime was 7.1 MPa at 7 days. Moreover, the compressive strength of mixes with 25% replacement of Portland cement by red ceramic waste was 11% higher than the reference waste-free composition. The red ceramic waste depicted adequate characteristics to be used in the production of large volumes of Portland and lime mixes commonly employed in the civil construction.

Use of numerical method for optimization of granulometric curves in eco-efficient concrete

“…Taking into account the mechanical behavior of concretes, Figure 16 shows the results of compressive strength of the studied concretes, where can be observed a greater increase at 91 days in concretes with GCBW. This behavior can be explained by the pozzolanic activity (on a smaller scale) of this material that could be identified in previous studies [37,40,41]. The pozzolanic properties were not extensively investigated in the GCBW used.…”

Experimental study on potential suitability of natural lime and waste ceramic dust in modifying properties of highly plastic clay

“…As a result, the silicates (SiO2) and aluminates (Al2O3) from the clay particles are dissolved. The silicates get ionized with increase in PH of pore water which in turn raises the cation exchange capacity [ 33 , 37 ].…”

“…In the stabilization of clayey soils not only the physical properties of the soil are affected but also its chemical properties are altered as a result of reactions taking place between the negatively charged clay particles and the cation from the stabilizers like limestone and waste ceramic dust [ 23 , 26 , 33 ]. Limestone is rich in calcium ion (Ca 2+ ) and ceramic dust contains sodium ion (Na 2+ ) which has paramount significance for effective cation exchange and development of flocculation-agglometration [ 28 ].…”

“…The pozzolanic reaction hence contributes to development of cementetious materials having strong bond [ 30 ]. Application of lime stabilization expedites constructions in clay soil even during rainy weather, due to proven drying action of lime material [ 33 ].…”

Influência do teor de material pulverulento (<75 μm) do agregado miúdo de resíduos de construção e demolição em argamassas de cimento Portland

“…Uma das alternativas na construção civil é a reciclagem e reutilização de resíduos de construção e demolição (RCD). Estudos acerca da utilização deste material como agregado em argamassas e concretos vêm sendo desenvolvidos a fim de [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]: reduzir a quantidade de material descartado nos aterros, amenizando a emissão de CO 2 ; reduzir o consumo de energia gasto no transporte e mineração; e diminuir a necessidade de exploração de Influência do teor de material pulverulento (<75 μ μm) do agregado miúdo de resíduos de construção e demolição em argamassas de cimento Portland…”