World scientific research journal
https://scientific-jl.com/wsrj
Volume-40_Issue-1_June-2025
338
LIGHTWEIGHT CONCRETE PRODUCTION
BASED ON INDUSTRIAL WASTE
Murodilova Mukhayyo Alisher qizi
Master's student of Fergana State Technical University
E-mail: yoldashevamuhayyo99@gmail.com
Abstract
: The increasing demand for sustainable and cost-effective construction
materials has prompted the exploration of innovative alternatives to conventional
concrete. This study investigates the production of high-performance lightweight
concrete utilizing industrial waste such as crushed plastic, glass, and demolition
debris. The research highlights the selection of materials, mix design, experimental
procedures, and evaluates the mechanical, thermal, and environmental performance
of the resulting concrete. Results indicate that incorporating industrial waste materials
significantly reduces density and enhances thermal insulation while maintaining
adequate compressive strength. The findings support the environmental and economic
feasibility of waste-based lightweight concrete for modern construction applications.
Keywords
: Lightweight concrete, Industrial waste, Crushed plastic, Crushed
glass, Demolition debris, Sustainable construction, Thermal insulation, Circular
economy
1.Introduction
The construction sector is one of the leading contributors to environmental
degradation due to the extensive consumption of raw materials, energy, and the
generation of construction and demolition waste. According to the International
Energy Agency (IEA), the global building and construction industry accounts for
approximately 39% of global carbon dioxide (CO₂) emissions, a significant portion
of which stems from the production and use of traditional concrete. The extraction of
natural aggregates such as gravel and sand, and the manufacture of Portland cement,
further contribute to land degradation, resource depletion, and greenhouse gas
emissions. In parallel with rapid urban expansion and infrastructure development,
especially in developing countries, the demand for sustainable and environmentally
responsible construction materials has become critical. The adoption of eco-efficient
materials that not only reduce environmental burdens but also offer cost advantages
is gaining momentum globally. One promising solution is the development of
lightweight concrete incorporating industrial waste, which addresses multiple
sustainability challenges simultaneously: waste management, resource conservation,
and climate change mitigation.
World scientific research journal
https://scientific-jl.com/wsrj
Volume-40_Issue-1_June-2025
339
Lightweight concrete, characterized by lower density compared to traditional
concrete, provides advantages such as reduced structural loads, easier handling and
transportation, and improved thermal insulation. These benefits make it especially
suitable for high-rise buildings, partition walls, prefabricated elements, and
renovation projects. When produced using recycled materials, lightweight concrete
also serves as a platform for implementing circular economy strategies in
construction, wherein waste products are reused and reintegrated into the value chain.
This study focuses on producing lightweight concrete using readily available
industrial waste materials such as crushed plastic from post-consumer PET bottles,
crushed glass from bottle and industrial scraps, and demolition debris consisting of
concrete and masonry fragments. These materials are abundant, non-biodegradable,
and often disposed of in landfills, contributing to long-term environmental issues. By
redirecting such waste streams into construction applications, it is possible to not only
reduce the ecological footprint of building materials but also mitigate the solid waste
crisis faced by many urban areas.
The objective of this study is to evaluate the technical, environmental, and
economic feasibility of integrating these industrial wastes into lightweight concrete
blocks for both structural and non-structural applications. The research explores
material selection, mix design, production methodology, and performance analysis
through laboratory testing. Key parameters such as compressive strength, density,
thermal conductivity, water absorption, and fire resistance are examined.
Additionally, the broader environmental and economic implications are assessed,
contributing to the advancement of sustainable construction practices in line with
global climate and development goals.
2. Materials and Methods
Materials: This study used a combination of conventional and recycled materials
to produce lightweight concrete. The primary binder was Ordinary Portland Cement
(OPC), while clean river sand served as the fine aggregate.
The industrial waste materials included:
Crushed plastic: Post-consumer PET bottles and containers.
Crushed glass: Discarded glass bottles and industrial glass waste.
Demolition debris: Recycled concrete and brick fragments from demolished
buildings.
The mix design was proportioned by weight as follows:
Cement – 40%
Industrial waste – 30%
Sand – 20%
Water and plasticizer – 10%
This ratio was selected to achieve a balance between strength, weight reduction,
and environmental benefit.
World scientific research journal
https://scientific-jl.com/wsrj
Volume-40_Issue-1_June-2025
340
Preparation Process: Waste Processing: The raw waste materials were first
processed using specialized equipment:
Plastic shredder: A 7.5 kW industrial-grade unit was used to shred PET plastics.
Equipment cost ranges from $3,500 to $5,000.
Glass crusher: A machine with a processing capacity of 500 kg/hour was used
to crush glass waste. Price range: $4,500–$7,000.
Concrete crusher: A heavy-duty crusher capable of processing demolition
debris. Estimated cost: $10,000–$20,000.
Mixing: The dry materials — cement, sand, and processed waste — were mixed
thoroughly in a concrete mixer until a uniform blend was achieved. Water and a
plasticizer were then added to ensure proper workability.
Molding and Curing: The specimens were cured in water for 28 days under
controlled conditions (temperature 20–25°C, relative humidity >90%). This ensured
proper hydration and strength development.
Testing Parameters: After curing, the concrete specimens were tested in the
laboratory for the following key performance indicators:
Compressive Strength: To assess load-bearing capacity.
Density: To determine material weight and porosity.
Thermal Conductivity: To evaluate insulation properties.
Water Absorption: To measure moisture uptake.
Fire Resistance: To assess behavior under high temperatures.
Acoustic Insulation: To test sound-absorbing capabilities.
These tests provided a comprehensive understanding of how industrial waste
materials affect the mechanical and thermal performance of lightweight concrete. The
results are presented and analyzed in the next section.
3. Results
Property
Result
Remark
Density
20% lighter than M400
concrete
Enhances handling and reduces load
Compressive
Strength
M350–M400
Suitable for load-bearing applications
Thermal
Conductivity
0.25 W/(m·K)
Good insulation performance
Water Absorption
5–6%
Requires protective coating for exterior
use
Surface Finish
Smooth, uniform
Suitable for direct painting or plastering
Fire Resistance
Passed standard tests
Meets construction safety requirements
Sound Insulation
40–45 dB
Effective for urban environments
World scientific research journal
https://scientific-jl.com/wsrj
Volume-40_Issue-1_June-2025
341
4.Discussion
The findings demonstrate that the integration of crushed industrial waste into
concrete not only reduces weight and improves insulation but also supports
sustainability goals. The lighter density facilitates easier transportation and
construction, while the thermal performance can lead to energy savings in buildings.
Crushed plastic and glass contribute to improved insulation, while demolition waste
ensures resource recovery.
Economically, the use of waste materials results in a 15–25% reduction in
production costs due to decreased reliance on virgin raw materials.
World scientific research journal
https://scientific-jl.com/wsrj
Volume-40_Issue-1_June-2025
342
These savings, coupled with environmental advantages such as reduced landfill
use and emissions, highlight the feasibility of this approach for large-scale adoption.
However, water absorption remains a concern, necessitating surface treatments.
Also, variability in waste properties requires consistent processing and quality
control. Future research should address particle grading, advanced admixtures, and
long-term durability.
5.Conclusion
This study demonstrates the technical and environmental feasibility of using
industrial waste materials — including crushed plastic, glass, and demolition debris
— in the production of lightweight concrete. The results indicate that such concrete
can achieve adequate compressive strength for both structural and non-structural
applications while offering enhanced thermal insulation, reduced density, and
moderate water absorption.
Incorporating waste materials in concrete production not only helps reduce
dependency on natural resources but also diverts significant volumes of waste from
landfills. This contributes to cleaner urban environments and supports global efforts
to reduce construction-related carbon emissions. Moreover, the use of recycled
materials was shown to reduce production costs by up to 25%, making the solution
economically attractive for large-scale applications. From a sustainability
perspective, this approach aligns closely with the principles of the circular economy
by closing material loops and promoting resource efficiency. The improved thermal
properties of the concrete can also contribute to energy savings in buildings, reducing
operational emissions over the structure’s lifetime.
While some challenges remain — such as maintaining quality with variable waste
inputs and ensuring long-term durability — the findings provide a strong foundation
for further research. Future studies may explore optimized mix designs, additive
technologies, and field-scale implementations to enhance performance and
scalability.
In conclusion, the use of industrial waste in lightweight concrete production
presents a practical, cost-effective, and eco-friendly alternative to conventional
materials. Its widespread adoption can play a critical role in transitioning the
construction industry toward more resilient, sustainable, and low-carbon building
practices.
References:
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Siddique, R. (2008). Waste Materials and By-Products in Concrete. Springer.
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ASTM C796/C796M-19. Standard Test Method for Foaming Agents for Use in
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World scientific research journal
https://scientific-jl.com/wsrj
Volume-40_Issue-1_June-2025
343
4.
Bentur, A., & Mindess, S. (2006). Fibre Reinforced Cementitious Composites.
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IS 456:2000. Plain and Reinforced Concrete – Code of Practice. Bureau of Indian
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