Use of Off-ASTM Class F Fly Ash and Waste Limestone Powder in Mortar Mixtures Containing Waste Glass Sand

Abstract

Developing sustainable concrete with less ordinary Portland cement is a growing issue in the construction industry. Incorporating industrial by-products (such as fly ash or slag) or municipal solid wastes (such as waste glass or recycled concrete aggregate) into the concrete becomes an effective way to reduce the consumption of natural sources and carbon dioxide emission if a proper mix design is provided. The present study examines the influence of the combined use of off-ASTM Class F fly ash (FFA) and waste limestone powder (LSP) on flowability, compressive strength, and expansion characteristics of mortar mixtures containing waste glass sand (WGS). FFA and LSP were used as cement replacement while WGS was used as partial reactive siliceous river sand replacement. Material variables included different WGS replacement ratios (25%, 50%, and 75%) with river sand, LSP contents (25%, 50%, and 75%), FFA contents (15%, 30%, and 45%), and different combinations of FFA-LSP (15–10%, 15–15%, 15–30%, and 15–35%). It is shown that the single use of FFA or LSP reduces both compressive strength and flowability of mortar mixture as its replacement level increases. However, mixtures combined with FFA and LSP provide higher or comparable strength to the single LSP or FFA mixture. For the expansion characteristics due to alkali-silica reaction, the single-use of more than 30% FFA or 75% LSP has less than 0.1% expansion, which is a non-reactive aggregate criterion based on the C1260/C1567 when the test period is extended to 56 days. Moreover, the combination of FFA and LSP has a considerable reduction in expansion rate compared to the single FFA or LSP mixture.

Synthesis and Evaluation of Geopolymer Mixtures Containing Chronologically Aged Basic Oxygen Furnace Slags

“…The alkali-silica gel takes in water, expanding and exerting an osmotic pressure against the surrounding paste or aggregate. When the expansionary pressure exceeds the tensile strength of the cementitious material mixture matrix, cracks on/in the mixture matrix occur [64,65]. Therefore, Ca(OH) 2 and high OHion concentrations are necessary to induce ASR expansion.…”

Recycling of Basalt and Limestone Cutting Dust in Concrete Mix Design

“…Many regions around the world are currently experiencing a scarcity of high-quality natural sand, which is essential for concrete production. To protect invaluable natural areas, precautionary measures have been implemented in several countries to limit the extraction of river sand [8][9][10][11][12]. In Jordan, there is a lack of technical studies analyzing the concrete properties of typical rocks found in its geological composition.…”

Influence of Rock Dust Additives as Fine Aggregate Replacement on Properties of Cement Composites—A Review

“…The water may become cloudy due to the sediment that will form during the dredging operations, the fish may drown due to the sediment that will form, and the sunlight from which the aquatic vegetation feeds may be blocked [13][14][15][16]. Due to the massive depletion of river sand and strict environmental requirements, there is a shortage of sand for building materials production in many countries around the world [15,[17][18][19][20][21]. Furthermore, there is currently a deficiency of good quality natural sand that may be used in concrete production in many regions of the world [15,17,18,22].…”