Under the India “Housing for all” scheme, 20 million urban houses have to be constructed by 2022, which requires the rate of construction to be around 8000 houses/day. Previous results by the team show that present design methods for affordable buildings and structures in India need improvement. The challenges are the disposal of solid waste generated from agro-industrial activities and the energy peak demand in extremely hot and cold seasons. The development of bio-based urban infrastructure which can adapt to the climatic conditions has been proposed. Inclusion of sustainable materials such as agro-industrial by-products and insulation materials has resulted in effective environmental sustainability and climate change adaptability. Precast components are highlighted as a suitable solution for this purpose as well as to fulfil the need of mass housing. India has a lesser record in implementing this prefab technology when compared to a global view. For the first time, a novel and sustainable prefab housing solution is tested for scale-up using industrial waste of co-fired blended ash (CBA) and the results are presented here. A model house of real scale measuring 3 × 3 × 3 m³ was considered as a base case and is compared with 17 other combinations of model house with varying alignment of prefab panels. Comparison was made with commercially available fly ash brick and CBA brick with a conventional roof slab. A simulation study was conducted regarding cost and energy analysis for all the 18 cases. Various brick and panel compositions with CBA for housing were tried and the superior composition was selected. Similarly, 18 model houses of real scale were simulated, with different combinations of walls made of bricks or panels and different building orientations, to check the impact on energy peak cooling and cost. Results show that peak cooling load can be reduced by six times with bio-based prefab panels. Prefab construction can be considered for mass housing ranging above 100 housing units, each consisting of an area of 25 m².

Excessive consumption of cement in construction materials has resulted in a negative impact on the environment. This leads to the need of finding an alternative binder as a sustainable construction material. Different wastes that are rich in aluminosilicates have proved to be a valuable material for alkali-activated product development, which contains zero cement. Alkali-activated products are claimed to be sustainable and cost-effective. In the present study, alkali-activated reinforced masonry mortar was developed using locally available industrial waste (co-fired blended ash—CBA). Appropriate mortar design is one of the key challenges as connections between two structural elements play a significant role in building construction. The mortar designed with suitable fiber reinforcement shall significantly help to enhance the fresh, mechanical, durability, and dynamic properties. Chopped basalt fibers (CBFs) obtained from basalt rock are one of the eco-efficient fibers applied as a reinforcing material. The present study checked the feasibility of novel industrial waste-co-fired blended ash (CBA) in the development of alkali-activated masonry mortar and reinforced alkali-activated mortar. In view of sustainable construction material design, the study elaborated the application of chopped basalt fibers (CBFs) in alkali-activated mortar design. The mortar cubes were cast and tested for various properties with varying percentages of chopped basalt fibers (0.5%, 1%, and 1.5%). The results suggest that developed mortars were able to achieve higher compressive strength (10–18 MPa) and flexural strength (3–3.5 MPa). Further, based on the properties of developed alkali-activated reinforced mortar, masonry prisms were cast and evaluated for the bond strengths (flexural and shear) of masonry. The optimum properties of alkali-activated mortar were found for the mix design of alkali activator to solid ratio of 0.40 and 0.5% CBF percentage. Application of CBF in CBA alkali-activated reinforced masonry mortar proved to be an efficient construction material with no cement.

The increasing urban population requires rapid housing construction. Rising global temperatures have led to more space cooling options inside buildings. There is a need to design new-age buildings with a sustainable, thermal comfort, and energy-efficiency approach. The present work integrates this approach into the design of prefabricated elements. Locally available co-fired ash, along with other sustainable alternates, are used in developing these elements. This study involves a performance evaluation and feasibility assessment of the proposed prefabricated system. A small-scale model house of one-third size is constructed using these elements for the purpose of functional evaluation. An average temperature variation of approximately 4 °C is observed upon comparison with the fly-ash brick model during the peak summer season. During energy assessment, a 12% and 52% decrease in embodied energy and peak cooling loads were observed. The time study resulted in 20% time savings over the conventional technique. The proposed system also includes a solar photo-voltaic panel, which compensates for 30% of the energy demand and reduces approximately 42% of the energy cost. Thus, the developed prefabricated system is found suitable for non-load bearing as well as functional applications. The performed studies determined the system to be sustainable, lightweight, quick, as well as energy efficient.

The construction industry is facing growing concerns over the environmental impacts and sustainability of its waste management practices, particularly in relation to construction and demolition waste. This research paper explores the potential of Building Information Modeling (BIM) implementation as a means to enhance construction and demolition waste management and pave the way for a circular economy. The present study has examined the current state of construction and demolition waste management practices, highlighting the significant environmental and economic impacts associated with traditional linear waste disposal methods. It then delves into the principles of a circular economy, emphasizing the importance of reducing waste generation, promoting recycling and reuse, and minimizing resource consumption.