SELF HEALING CONCRETE WITH RECYCLED AGGREGATE

Abstract

Recycling concrete waste through the use of Bacillus subtilis offers an innovative approach to sustainable construction. Bacillus subtilis, a beneficial bacteria known for its ability to promote mineralization, can enhance the properties of recycled aggregate, making it a more viable option for concrete production. Introducing Bacillus subtilis can improve the mechanical properties and durability of these recycled aggregates. This bioremediation process not only strengthens the aggregates but also reduces the environmental impact of concrete production. By recycling concrete waste, we can significantly decrease the need for virgin materials, thereby conserving natural resources and reducing landfill waste. Additionally, the use of Bacillus subtilis contributes to a more eco-friendly construction industry by minimizing carbon emissions associated with traditional concrete manufacturing. Addition of 2.5 % Bacillus subtilis offers innovative approach not only addresses the challenges of waste management but also paves the way for a circular economy in construction materials.

Specification

DESCRIPTION:
[001]The present invention seems to be a promising potential of Utilizing recycle coarse aggregate in Bacterial concrete to improve the durability and sustainability of concrete structures. Till now there the recycled aggregate has not been used in the Bacterial concrete.
PRIOR ART AND BACKGROUND:
[002] KR20190049123A In the patent it is described that shotcrete mixing design capable of reducing the material cost while maintaining strength and a construction method. The shotcrete mixing design, as a mixing material mixed with shotcrete, comprises: cement; fine powder sludge; recycled aggregate; sand; and coarse aggregate and the shotcrete mixing design and the construction method of the present invention use the recycled aggregate and a photocatalyst, wherein the recycled aggregate, as the mixing material for surface-treating the shotcrete, comprises: the cement; the fine powder sludge; fine aggregate; the photocatalyst (TiO_2).
[003] CZ202079A3 This patent describes about Fresh concrete with self-healing ability consists in that it contains in 30 m3 30 to 300 kg of water, 135 to 450 kg of cement or 135 to 600 kg of cement mixture and at least one of its substituents, 1000 to 2400 kg of aggregate with an upper fraction up to 40 mm, wherein at least 55 wt. The aggregate consists of natural aggregate, and further 10 to 300 kg of inert construction demolition waste and / or industrial waste from the production of construction products in the form of powder with a particle size of 5 to 250 ,m, preferably 5 to 125 pm. The dry mix for the preparation of this concrete is also described.
[004] CN105731851B The invention discloses a kind of high-strength light cracking resistance auxiliary material and the method for improving concrete anticracking and thermal insulation property, which is made of the spherical baking-free ceramicite and special interface agent of high-strength light. For the partial size of the haydite used for 8~15mm, loose bulk density is 800-1000kg/m3, cylindrical compress strength is 4~6.5MPa, and water absorption rate is 15%~25%.Interfacial agents use organic additive, can significantly improve baking-free ceramicite and mortar interface adhesion strength and slow release wherein moisture. Cracking resistance supplementary product consumption of the present invention is the 10%~25% of pump concrete volume, significantly improves the crack resistance and thermal and insulating performance of concrete structure, and realize Self-curing .The present invention can be used for the
cast-in-place pumping concrete construction process of flooring, ground and roofing of building.
[005] CN101446122A The above patent discloses a self-conserving heat
green concrete assembled large panel which comprises green concrete at both sides and a thermal protection panel clamped between the concrete. The green concrete aggregates are made of clay brick recycled aggregates. A preparation method for the self-conserving heat green concrete assembled large panel is also disclosed. The self-conserving heat green concrete assembled large panel has the advantages of light weight, heat self-conserving performance and good durability. The self-conserving heat green concrete fabricated large panel also can save resources, improve the construction efficiency and realize the high value added utilization of construction waste. The above inventions are existing with reference to our patent. To conclude, Comparing all the inventions our invention is different from the all the above.
OBJECTIVE:
[006] To produce an optimum mix design for Recycled Aggregate (RCA) self-healing concrete for a sustainable environment. To study the mechanical, durability characteristics of novel developed RCA self-healing concrete.
SUMMARY:
[007]The concrete mix M30, OPC of 53 grade Cement is used for the investigation of study. The fine aggregate used is confined to Zone-ll and maximum size of coarse aggregate is 20mm. The workability tests are carried out immediately after mixing of concrete using the compaction factor testing apparatus in accordance with IS: 10510-1983.10ml reference of bacteria (Bacillus subtilis- 2.5%) was added to every while mixing concrete, so the total amount of bacteria and calcium lactate was added together required with cement and 0% to 20% reference of recycled aggregates was replaced on natural coarse aggregates for mixing cement concrete. The recycled aggregates were produced and checked with normal coarse aggregate used for the investigation. The mixing process is carried out in hand mixed. The materials are laid in Uniform layers, one on the other in the order - recycled aggregates, coarse aggregate, fine aggregate and cement. Dry mixing is done to obtain a uniform colour. Mix design has been done based on IS10262:2019. From the test results indicated that in replacing 20% bacteria performance
well in compare with conventional concrete
DETAILED TECHNICAL DESCRIPTION:
[008] The conflict between the depletion of natural resources and the increasing need for building materials leads to the use of recycled aggregates in concrete. Bacterial self-healing concrete is an innovative and hygienic material whose carrier possesses a major effect on how effectively repairs work. Recycled coarse aggregate were the carriers utilized in this study. Recycled coarse aggregate is a good replacement raw material for natural coarse aggregate in concrete. The research involved the introduction of calcium lactate into sustainable concrete and the Bacillus subtilis bacteria as a crack repair a solution. The new concrete termed Bacterial concrete mix provides economic benefits and environmentally friendly alternatives. The healing precipitate was characterized analytically, and mechanical parameters were measured at specific times using compressive and split tensile strength.
CLAIM:
WE Claim,
7 1. Bacillus subtilis- 2.5% was added to every while mixing concrete, so the total amount of bacteria and calcium lactate was added together required with cement and 0%, 20% reference of recycled aggregates was replaced on natural coarse aggregates for mixing cement concrete.
v' 2. The recycled aggregates were produced and properties were checked with normal coarse aggregate used for the investigation.
J 3. Bacterial concrete' was produced with recycled coarse aggregate with 20% optimum replacement with normal aggregates. The strength properties were tested as per IS standard and checked. Bacterial concrete performs well in par with the conventional concrete.

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