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... ©IJRASET: All Rights are Reserved | SJ Impact Factor 7.538 | ISRA Journal Impact Factor 7.894 |(Hossiney et al., 2020) ...
The study's goal is to create cost-effective and eco-friendly pervious paver blocks by reusing asphalt pavement at 0%, 50%, and 100% weight ratios. Building permeable paver blocks using RHA (Rice Husk Ash), an industrial waste product with a Cementous ratio of 10% to 20% by weight, is a step toward a more eco-friendly and cost-effective future. Both recycled asphalt pavement (RAP) aggregates and newly quarried "fresh aggregates" (FA) were employed in this investigation. Bituminous concrete (BC) pavement that was 2 years old and stored in dumping yard besides the Rahul warehouse in Gwalior, Madhya Pradesh on Srinagar-Kanyakumari Highway yielded RAP with a nominal maximum aggregate size of 13 mm. The production of PCPB has been standardized. This technique is known as the "cement paste encapsulating aggregate blending method." "After adding all of the aggregate and 20-25% of the total calculated water content, the concrete mixer was operated for 15-20 seconds". The RP overseas in Lohgarh (M.P.) provided the rice husk ash that was used in the project. Rice husk ash (RHA) has a high specific gravity of 2.10 and a low bulk density of 0.781 g/cc, making it highly reactive and pozzolanic. RHA is recommended for use in both plain and reinforced concrete by the IS 456-2000 Indian Standard code of practice. The results of the investigation demonstrated that G2 graded mixes had higher porosity than G1 graded mixes. The results showed that CL values were minimal at w-c ratios of 0.35. The cement paste at this water-to-cement ratio is strong enough to bind the aggregate particles together, which explains why this occurs. In comparison to the conventional approach, the optimal replacement level of RHA results in block costs that are reduced by 7.5% for 0 RAP and 10% RHA, 15% for 0 RAP and 20% RHA, 20% for 50% Rap and 10% RHA, 27% for 50% RAP and 20% RHA, 33.2% for 100% RAP and 10% RHA, and 40.62% for 100% RAP and 20% RHA. The conclusion is that RHA-made paver blocks are reliable and cost-effective. The conclusion is that paver blocks made by RHA are durable and affordable.
Reclaimed Asphalt Pavement (RAP) as recycled aggregates is a relatively a new construction process of rigid pavements due to the scarcity and degradation of natural aggregates. This study aims at sequential characterization of RAP aggregate to obtain an optimized proportions for strength. For this purpose, RAP aggregates were used for replacement of natural aggregates (NA) in concrete mix which was achieved by varying from 0 -100% . Furthermore, zirconia silica fume (ZSF) were used as an partial replacement of the cement in the concrete mix, replacing Ordinary Portland Cement (OPC). Experimental studies have shown that the incorporation of washed RAP (WRAP) slightly reduces the compressive strength of concrete by 2.7- 37.35% as compare to the reference control concrete mix. Although the 7-days, 28-days and 56-days compressive strength of WRAP recycled aggregate based concrete are slightly better than 7-days, 28-days and 56-days compressive strength of dirty RAP (DRAP) recycled aggregate based concrete. Similar trend was observed in the flexural strength and split tensile strength of WRAP recycled aggregate based. Overall, the results show that 40% WRAP recycled aggregates with 10% ZSF as a replacement of cement outperform DRAP aggregates in concrete mixes. According to the ANOVA results, the combination of ZSF and WRAP aggregates met the cement concrete pavement strength standard, thereby contributing to sustainable development. Reclaimed Asphalt Concrete Pavements (RACP) are now seen as a potential and long-term answer to the present environmental and economic crisis.
This study was undertaken to evaluate the potential of demolished building waste (DBW) as aggregates in alkali-activated concrete (AAC). A recent road-widening activity led to the demolition of commercial buildings along National Highway 275, Bangalore-Bantwal, India. DBW was collected from these sites and processed manually at the laboratory facility of CHRIST (Deemed to be University). Processing of DBW was done to obtain both waste coarse and fine aggregates from demolished concrete and brick waste units, respectively. AAC was synthesized by fly ash, ground granulated blast furnace slag, sodium hydroxide, sodium silicate, along with waste aggregate replacement rates of 0, 25, 50, and 75% by weight of natural aggregates. Fresh and hardened properties of developed concrete mixtures were experimentally determined. Results of the study indicate that 28-day compressive strength of 30.4 and 21 MPa was obtained for AAC with 25 and 50% DBW aggregates, which was 8.6 and 36.9% lower than control mix, respectively. Further, there was an increase in the water absorption and a reduction to acid resistance for all the AAC mixes with DBW aggregates. Based on the results obtained, it was observed that AAC with 25 and 50% DBW aggregates find great potential in civil engineering applications.
