As ground glass pozzolan has recently been considered a supplementary cementitious material by the Canadian Standard of Association (CSA A-3000) and the American Standard (ASTM-1866), there is limited study on ground glass utilization on site. So, in this study, several sidewalk projects were performed by the SAQ industrial chair, the University of Sherbrooke, Quebec, Canada, from 2014 to 2017 on fields with different proportions of ground glass (i.e., 10, 15, and 20%) in different conditions are considered in such a cold climatic region. Sidewalks are a non-structural plain concrete element that is among the most exposed to chloride, and freezing and thawing in saturated conditions of municipal infrastructures. Coring campaigns were carried out after several years of exposure to these concrete (between 5 to 8 years). The results of core samples extracted from the sites were compared to the laboratory-cured samples taken during the casting. These laboratory concrete mixtures were tested for fresh, hardened (compressive strength), and durability (freeze-thaw, scaling resistance, chloride ion penetrability, electrical resistivity, and drying shrinkage) properties (up to 1 year). The results show that ground glass concrete performs very well at all cement replacement in all manners in terms of long-term performance. Besides that, using ground glass pozzolan in field projects also decreases carbon footprint, and environmental and glass disposal problems.

Pumping of air-entrained concrete can result in a variable of air content, which leads to possibly rejected concrete. This research used air volume, SAM Number (AASHTO T395), Bulk Freeze-Thaw (ASTM C666), and Hardened Air Void Analysis (ASTM C457) to investigate the air void quality and freeze-thaw durability performance of concrete before and after pumping. The laboratory results show the fresh air testing measurements after pumping fresh concrete are not accurate indicators of the freeze-thaw resistance based on the hardened air void analysis. However, testing fresh concrete prior to pumping is a better indicator of the freeze-thaw performance.

Ultra-high-performance concrete (UHPC) is considered a sophisticated concrete construction solution for infrastructure and other structures because of its premium mechanical traits and superior durability. Fibers have a special effect on the properties of UHPC, especially as this type of concrete suffers from high autogenous shrinkage due to its high cementitious content, so the properties and volume fraction of fibers are more important in UHPC. This study will describe previous related works on the mechanical behavior of UHPC specimens reinforced with micro- and nanoscale fibers, and compare of the behavior of UHPC reinforced with microfibers to that reinforced with nanofibers. The compressive strength, flexural behavior, and durability aspects of UHPC reinforced with nanoand/or microscale variable types of fibers were studied to highlight the issues and make a new direction for other authors.

In light of the effort for decarbonization of the energy sector, it is believed that common geopolymer binding materials such as fly ash may eventually become scarce, and new geological aluminosilicate materials should be explored as alternative binders in geopolymer concrete. A novel, tension-hardening geopolymer concrete (THGC) that incorporates high amounts of semi-reactive quarry wastes (Metagabbro) as a precursor and coarse quarry sand (granite) was developed in this study using geopolymer formulations. The material was optimized based on the particle packing theory and was characterized in terms of mechanical, physical, and durability properties (i.e., compressive, tensile, flexural resistance, Young’s Modulus, Poisson’s ratio; absorption, drying shrinkage, abrasion, and coefficient of thermal expansion; chloride ion penetration, sulfate, and salt-scaling resistance). The developed THGC with an air-dry density of 1,940 kg/m³ [121 lb/ft³], incorporates short steel fibers at a volume ratio of 2% and is highly ductile in both uniaxial tension and compression (uniaxial tensile strain capacity of 0.6% at an 80% post-peak residual tensile strength). Using DIC, multiple crack formation was observed in the strain-hardening phase of the tension response. In compression the material maintained its integrity beyond the peak load, having attained 1.8% compressive strain at 80% post-peak residual strength whereas upon further reduction to 50% residual strength, the sustained axial and lateral strains were 2.5% and 3.5%, respectively. The material exhibited low permeability to chloride ions and significant abrasion resistance due to the high contents of Metagabbro powder and granite sand. The enhanced properties of the material, combined with the complete elimination of ordinary Portland cement from the mix, hold promise for the development of sustainable and resilient structural materials with low CO₂j, emissions while also enabling the innovative disposal of wastes as active binding components.

In marine structures, concrete requires adequate resistance against chloride ion penetration. As a result, numerous studies have been conducted to enhance the mechanical properties and durability of concrete by incorporating various pozzolans. This research has investigated the curing conditions of samples including zeolite and metakaolite mixed with Micro nanobubble water in artificial seawater and standard conditions. The results indicated that incorporating zeolite and metakaolin mixed with Micro nanobubble water, which was cured in artificial seawater conditions, compared to similar samples that were cured in standard conditions, improved the mechanical properties and durability of concrete samples. The compressive strength of 28 days concrete samples containing 10% metakaolin mixed with 100% Micro nanobubble water and samples consisting of 10% zeolite blended with 100% Micro nanobubble water cured in seawater in comparison to the control sample cured in the standard condition indicated an increase of 25.06% and 20.9%, respectively. The most results were obtained with a compound of 10% metakaolin, and 10% zeolite with 100% Micro nanobubble cured in seawater (MK10Z10NB100CS) which rose significantly Compressive, Tensile and Flexural Strength by 11.13, 14, and 9.1%, respectively, in comparison with to the MK10Z10NB100 sample cured in the standard condition. Furthermore, it decreased considerably 24-hr water absorption and Chloride Penetration at 90 days by 27.70 and 82.89%, respectively, in comparison with the control sample cured in standard conditions.