MAJOR PROJECT PRESENTATION ON : EFFECT OF VACUUM DEWATERING ON FRC

[Virtual Presenter] Good morning everyone. Today I will be presenting on the effect of vacuum dewatering on F-R-C--. This project was undertaken by Prashant Jagannath Samleti Rohit Subhash Shinde Ravikant Aappasaheb Shivshran Hemant Balaji Vangari and Shiva Balaji Yeldi with Prof. S R Kulkarni as the project guide Prof. Dr S B More as Head of Department and Dr B K Sonage as Principal. Let us now begin our discussion on the topic and gain further insight into vacuum dewatering and its impact on FRC..

[Audio] Dewatering techniques for F-R-C involve the removal of excess water from the material to control permeability shrinkage and swelling. We will examine the different techniques used in this process and how they can be applied to achieve the desired outcomes. We will also explore future trends in F-R-C dewatering and what can be anticipated in the near future..

[Audio] This project aims to investigate the effect of vacuum dewatering on the flexural strength of glass fiber reinforced concrete or F-R-C--. Of the total 23 slides this is the third. Currently there is a lack of knowledge concerning the mechanical properties of F-R-C when vacuum dewatering is applied. Tests will be conducted to observe how F-R-C behaves under different conditions and how vacuum dewatering further affects the flexural strength of the material. Furthermore the impact of varying levels of fiber replacement on the flexural strength of concrete with and without vacuum dewatering will be examined. Once complete our results should be a valuable source of information for the industries and academic institutions that specialize in studying the mechanical properties of F-R-C under diverse conditions..

[Audio] This project presentation focuses on the effect of vacuum dewatering on Glass Fiber Reinforced Concrete (G-F-R-C-). G-F-R-C is a mixture of sand cement polymer water admixtures and glass fibers which can be further strengthened by adding different percentages of fiber and replacing cement in the concrete prisms. Reducing the w/c ratio to approximately 0.38 can greatly increase the strength of concrete. Vacuum microwave composite dewatering can be used to remove excess water from the concrete mixture optimizing performance and advancing construction practices..

[Audio] The project we are discussing today looks at the effects of vacuum dewatering on Fiber Reinforced Concrete or F-R-C--. It was submitted by Prashant Jagannath Samleti Rohit Subhash Shinde Ravikant Aappasaheb Shivshran Hemant Balaji Vangari and Shiva Balaji Yeldi. Materials used for this project were M-2-0 grade with cubes of 150x150x150 millimeters. Normal casting and dewatering as well as different percentages of fiber replacement were examined under different curing durations of 14 days 21 days and 28 days. This project was guided by Prof. S R Kulkarni with Prof. Dr S B More as Head of Department and Dr B K Sonage as Principal..

[Audio] For our experiments on the effects of vacuum dewatering on F-R-C we cleaned and oiled the steel cylinder mould as illustrated in the figures in order to make sure the concrete particles would not stick to the mould surface and that our results would be precise. This step is pivotal in the experimental process of vacuum dewatering..

[Audio] The project examined the consequences of vacuum dewatering on F-R-C otherwise known as fibre-reinforced concrete. The concrete mix employed was M-2-0 grade with a mix ratio of 1:1.5:3 of cement to fine aggregate to coarse aggregate using half the weight of the cement in water. Additionally a portion of the cement was substituted with synthetic fiber as demonstrated in Figure 3. The amounts of materials used for the concrete mix of the cube are featured in Table 1..

[Audio] Concrete is poured in 3 layers each compacted with 25 tamps using a steel rod. The mold is filled until it overflows and the surface is leveled using a hand float to ensure the concrete is distributed evenly across the mold..

[Audio] The pouring of concrete into the moulds is followed by vibration using a table vibrator for compaction. This compaction helps to make sure the concrete is firmly packed and has a strong and good quality. The vibrations are distributed uniformly across the moulds thus giving rise to a strong and consistent concrete structure..

[Audio] We employed vacuum dewatering in our project to assess its effects on F-R-C--. We started by making a concrete mixture cube which we allowed to set for a period of 24 hours. Following compaction of the cylinder we utilized a pump along with a nylon sheet to execute the dewatering method. This enabled us to observe the impacts of vacuum dewatering on FRC..

[Audio] Obtaining accurate measurements is essential for any project. For our project cylinders have been submerged in drums for curing and must be weighed and recorded after each curing interval. This is necessary to record the progress of the project. To make sure that our measurements are precise and dependable great care has been taken..

[Audio] The process of vacuum dewatering involves placing the cylinder of concrete on the center plate of the compression machine and ensuring that both plates are in contact with the lower surface of the cylinder as seen in figure 15 of the presentation. A vacuum of -0.09 bars is applied to the concrete cylinder for a duration of 3 hours during the testing process. This helps to reduce the water content significantly and reduces the total water-cement ratio resulting in a more durable concrete..

[Audio] We're going to discuss the factors that affect dewatering in fiber reinforced concrete or F-R-C--. As explored in the slide these factors include mix design fiber type length and content; aggregate gradation; and admixture interactions. All of these elements have a direct impact on the effectiveness of dewatering processes in this type of concrete. To produce optimal outcomes we must comprehend these factors..

[Audio] Discussing the effects of vacuum dewatering on F-R-C is the topic of today. Vacuum dewatering is a process which uses suction to extract water from F-R-C mixtures. It is a technique that has various advantages on F-R-C including increased compactness and strength. Vacuum dewatering in conjunction with other dewatering techniques like vibration centrifugation and pressing is critical in enhancing FRC's quality. This presentation is meant to give a better understanding of the advantages of vacuum dewatering on FRC..

[Audio] The project we are working on is about the repercussions of using vacuum dewatering on fiber-reinforced concrete (F-R-C--). This approach can be utilized to make the F-R-C mix denser and sturdier by employing vacuum-induced pressure to take out surplus water and create a more compressed version. This technique can encourage consolidation and eventually give a more excellent quality product..

[Audio] Modern construction techniques such as fiber-reinforced concrete have become a prevalent part of the infrastructure industry. The use of F-R-C technology has brought immense advantages such as improved strength durability and workability but to realize these benefits it is important that concrete mixtures be properly dewatered. By removing excess moisture from the material we can ensure enhanced mechanical properties improved workability and reduced shrinkage. Our project presented by Prashant Jagannath Samleti Rohit Subhash Shinde Ravikant Aappasaheb Shivshran Hemant Balaji Vangari and Shiva Balaji Yeldi supervised by Prof. S R Kulkarni Prof. Dr S B More and Dr B K Sonage demonstrates the effect of vacuum dewatering in F-R-C and the advantages that this brings to modern infrastructure..

[Audio] We can see how effective vacuum dewatering with various cement replacement levels was in this particular project. The results of our analysis show that up to 2% replacement of cement there is no significant difference in the compressive strength of F-R-C when subjected to vacuum dewatering. However with 2.5% replacement of cement a marked decrease in compressive strength is observed. This implies that we should take necessary precautions while performing vacuum dewatering to maintain the strength of FRC..

[Audio] The slide compares the compressive strength of conventional vacuum dewatering and vacuum dewatering with 1% 2% 2.5% 3% and 3.5% replacement of cement at 28 days. It can be observed that compressive strength is significantly greater when vacuum dewatering with cement replacement is used. This reveals the viability of this approach for dealing with FRC..

[Audio] Our project compared the split tensile strength of cylinders dried with a conventional drying method and those dried with vacuum dewatering methods. It was found that cylinders dried with added cement were much more resistant to tensile strength than those that weren't. On average cylinders dried with 1% replacement of cement experienced a split tensile strength increase of 3.49 and those dried with 3.5% replacement of cement experienced an increase of 3.3. These results demonstrate that the use of vacuum dewatering with added cement can significantly improve the tensile strength of cylinders..

[Audio] The results of our examination indicate that conventional vacuum dewatering has a flexural strength of approximately 2.9 MPa. When cement is replaced at 1% 2% 2.5% and 3% for vacuum dewatering the flexural strength improves. The greatest increase in flexural strength at 3.79 MPa is realized when 3.5% cement is used for vacuum dewatering and the results are assessed after 28 days..

[Audio] As the research and technology advances the potential of fiber reinforced concrete becomes ever clearer. Recent work has seen the focus turn to dewatering with new vacuum systems chemical admixtures and digital monitoring and automation all playing a role. Implementing these techniques could result in an improved quality of concrete while also reducing the resources used making fiber reinforced concrete a revolutionary construction material..

[Audio] Prashant Jagannath Samleti Rohit Subhash Shinde Ravikant Aappasaheb Shivshran Hemant Balaji Vangari and Shiva Balaji Yeldi's project has given deep understanding of how vacuum dewatering affects F-R-C--. Their experiments showed that various fiber replacement rates could influence concrete's mechanical properties. Their research showed that one should be meticulous when it comes to mix design in order to get the best outcomes in distinct applications. Their project has given a priceless contribution to comprehend the fibers' part in concrete..

[Audio] I would like to express my gratitude to Prashant Jagannath Samleti Rohit Subhash Shinde Ravikant Aappasaheb Shivshran Hemant Balaji Vangari and Shiva Balaji Yeldi with Prof. S R Kulkarni as project guide Prof. Dr S B More as Head of Department and Dr B K Sonage as Principal for their invaluable contributions towards this project. Our research has focused on the effect of vacuum dewatering on Fiber-Reinforced Composites and we have discussed our findings in light of literature from various sources. We have also presented our conclusions in this presentation. I would like to thank you for your attention..