This study investigates the characteristics of ternary geopolymer mortar incorporating bacteria as a self-healing agent. The research aims to develop a novel self-healing ternary geopolymer mortar using fly ash (FA), ground granulated blast furnace slag (GGBS), and metakaolin (MK) as source materials for the geopolymer binder. Bacillus subtilis, a self-healing bacteria activated by moisture, is integrated into the mix design to produce calcium carbonate for filling microcracks. The study examines the physical and chemical properties of the raw materials, mix design, and specimen preparation. Visual inspection, compressive strength testing, and scanning electron microscopy (SEM) are employed to evaluate the performance of the geopolymer mortar. Results indicate that bacteriasupplemented samples exhibit higher compressive strength and improved self-healing capabilities compared to non-bacteria samples. The research contributes to the development of sustainable construction materials with enhanced durability and reduced maintenance requirements
Waste management is arguably the most critical challenge encountering civilization, and providing a way out is of paramount significance. This research targets two waste areas broadly 1. e-waste 2. Ceramic waste. Much work has been done on waste materials into concrete, but this research focuses on novel problem-solving approach by utilizing one waste material to complement other waste material to produce improvised concrete. This study aims to find out the best proportion for e-waste concrete with submicron ceramic waste powder for best mechanical properties, durability properties and micro structural properties. The ceramic waste powder has a high amount of silica content, which helps concrete gain strength while strength degradation takes place. Pulverization of ceramic waste powder has shown a good impact on strength gain phenomenon of e-waste based concrete. This research consists of M25 concrete with different w/c ratios of 0.45,0.47 and 0.50. Moreover, the ceramic powder will be replaced by ordinary Portland cement. Different percentages of e-waste utilized other than control concrete is 10, 20 and 30 %. The mixes are said to lose weight up to almost 2-13 %, which make a concrete light in weight. This research consists of various mixes cast and tested for different days curing period as 7, 28, 90, and 180 days. As reduces the mechanical properties, significant changes have been observed in this amalgamation of e-waste and pulverized ceramic waste powder (PCWP) in concrete.
With growing concerns over the depletion of natural resources, the use of recycled concrete aggregates (RCA) has gained attention as a sustainable alternative to natural aggregate (NA). While RCA has been widely explored in highway construction, its application in non-bituminous layers of aircraft pavements, including runways, taxiways, and aprons, remain underexplored. This study investigates the feasibility of RCA in these applications through a two-phase approach. In the first phase, laboratory trials were conducted by replacing NA with 100 % RCA in granular sub-base (GSB) and cement treated sub-base (CTSB), and 80 % RCA in wet mix macadam (WMM). These mixes were assessed for mechanical and durability properties to ensure compliance with standard specifications. The second phase involved constructing trial pavement sections using the optimized RCA-based mix designs, followed by field performance evaluations and quality control tests. The results demonstrated that RCA as a granular material meets the ministry of road transport and highways (MORTH) and federal aviation administration (FAA) specifications, ensuring structural adequacy and long-term performance. The trial sections exhibited satisfactory field performance, confirming the feasibility of RCA for sustainable pavement construction. This study highlights RCA as an environmentally friendly and resource-efficient alternative for non-bituminous layers in aircraft pavements. The successful implementation of RCA in such critical infrastructure can significantly contribute to reducing construction waste, conserving natural aggregates, and promoting sustainable construction practices
Research on the reuse and recycle of plastic waste in building construction offers a way to lessen waste plastic’s damaging impact on the environment and save natural resources. This work aims to find out the best proportion for e-waste concrete with bacteria for best mechanical properties, durability properties and micro structural properties. The flame retardant 4 (FR4) kind of plastic found inside of e-waste is not recyclable or biodegradable. Currently, landfills or incinerators are the methods employed for the elimination of this printed circuit board (PCB) garbage. With this study, researchers want to avoid that and instead make use of that plastic waste for construction applications. In the present case, M25 grade concrete with a w/c ratio of 0.45 is used. Now, to improve the above said properties, the study is conducted with bacteria as additive with the purpose of stopping strength degradation by e-waste concrete. Research work utilizes bacillus subtilis bacteria with different percentages of e-waste replacement. This summary consists of distinct mix proportions cast and tested for different days curing period as 7, 28, 90, and 180 days. The mixes are said to lose weight up to almost 2-13 %, which make a concrete light in weight. Moreover, the self-healing part of the bacteria is also explored. As PCB plastic material reduces the mechanical properties, significant improvement up to 8 % after bacteria induction in concrete have been observed.
A significant quantity of debris from building and demolition is produced on a yearly basis in every region of the globe. The environmentally conscious and economically astute management of the debris left behind from building construction and demolition projects is a pressing subject. There have been several efforts in the past that have been made to utilize the debris from building and demolition in construction sector. These efforts have been made to either replace natural aggregates with coarse or fine aggregates using construction and demolition debris. Recent attempts have been made by the asphalt pavement industry to include trash from building and demolition in the form of recycled concrete aggregates. These recycled aggregates are meant to take the place of natural or virgin aggregates. This article provides a synopsis of the research that has been conducted by the researchers and published in a variety of countries throughout the globe. The current review article organizes the available research into categories according to the tests that were conducted as well as the significant results that were reported. In addition, a summary of the life cycle analysis and a forecast of the characteristics of asphalt mixes incorporating recycled concrete aggregates (RCA) is also included in this paper. In addition to the conclusion, this article also presents the research voids that still need to be filled.
April 2025
Volume - 99
Number : 04
March 2025
Volume - 99
Number : 03
February 2025
Volume - 99
Number : 02
January 2025
Volume - 99
Number : 01
December 2024
Volume - 98
Number : 12
November 2024
Volume - 98
Number : 11
October 2024
Volume - 98
Number : 10
September 2024
Volume - 98
Number : 09
August 2024
Volume - 98
Number : 08
July 2024
Volume - 98
Number : 07
June 2024
Volume - 98
Number : 06
