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@studiot Hello again (this is quite an extended delay for a reply, I apologize)! Thank you for taking time to view the video and your approval. And, also, side note: There was a slight typo in there. It IS certified by a corporation I'm familiar with. Yikes. Our project basically aims to use regular hollow blocks as basis for comparison with the modified hollow blocks. If the quality (determined by compressive strength) is greater than the regular hollow blocks, there would also be a comparison between the modified blocks (which of the three types would serve as a—possibly— greater alternative for the regular type). To be specific, this project is our year-long investigatory project (IP) and is considered to be both an experimental and engineering IP, which, I guess, explains why we're aiming for both comparison and (somehow) creation/innovation. I've mentioned that we aren't the most knowledgeable in this topic, so we hypothesized that our modified hollow block will be stronger than that of the regular hollow block; as for the results between the modified blocks, we predicted—with our basic knowledge—that the blocks with incorporated metal would be stronger (thinking that it would make sense). As for the suggested concepts, I've managed to research and understand what I could: - Concrete actually shrinks once it has set, but it could expand under hot temperature and a change in the content of moisture. - The results I found looking it up was mostly filled with structure-based causes and factors, but a really rough summary of the research would be that it depends on the composition of the concrete (if it's the right type of concrete, exposure, rust—again, it was more of concrete in terms of already-established buildings and structures. Sorry about that ). - Load = force; Stress = force/area; basically, in this situation, the load would be the pressure applied by the testing machine while stress is what indicates if it breaks (I apologize for the very rough usage of terms here). That's what I could research on so far. Again—and I will never get tired of saying this—thank you! It truly means a lot to have your help and guidance so far, we really are struggling on this project, and thoroughly understanding this topic would make all our efforts worth it (If I misinterpreted anything, I apologize! Please do feel free to tell me if elaboration is needed. Thank you so much!)

@studiot Hello and thank you! Yes, we will be making the concrete hollow blocks ourselves; there would be three types, all containing a specific junk shop material (shredded rubber, cans, and metal for each respective type). Also, if it's alright to ask for a little more help, I've been researching more on the coverage of our project for the past few hours, and I found a video demonstrating compressive strength testing. I somehow consider it to be a reliable source as it isn't certified by a corporation that I am quite familiar with, and I think that I'm slowly figuring it out (although, of course, that could change). Here are the details: Sample: Ordinary Concrete Hollow Blocks Size: 340 L x 90 W x 20 face thickness x 25 web thickness Weight: 8.21 kgs Maximum load: 207, 573 N Compressive Strength: 1060 psi I tried making sense of it and tried to arrive at a certain formula, but I was wondering how they arrived at that result, and I somehow considered that there may be a missing factor that wasn't exactly given/stated. Although, I watched another video of theirs, but it was concerning concrete bricks. I figured it out with the basic knowledge I have of a formula I derived myself and converting N/mm2 or MPa to psi, although that is another thing entirely and I'm not certain of my methods. Could there be something else missing? Is this accurate and compatible with this specific project that we're working on? I apologize for asking too much, we really need to figure it out, and we have no idea if we're getting there or not. Thank you so much! (also, the video I stumbled upon if more details are needed:

Hello! My group mates and I are working on a project concerning potential reinforced concrete hollow blocks using junk shop materials. We're pretty new to the entire process, and we're not sure of how we will arrive to our results (if the final results will be declared via machine or derived through a certain formula). Either way, we've decided to include an equation for further explanation. Our aim is to compare the compressive strength—the topic we are researching on. Knowing which equation to use is somehow troubling since upon searching, results show the usage of the Hilsdorf Equation; although, according to a webpage I've encountered (https://theconstructor.org/practical-guide/compressive-strength-concrete-blocks-masonry-units/13966/), "the load at which masonry unit fails and the maximum load divided by gross sectional area of unit will give the compressive strength of block". We'd really appreciate a formula for compressive strength (and, if possible, an explation as well). We're newbies and we wish to have a smoother experience throughout this project. Thank you in advance!