Materials engineering Concrete

AI Thread Summary
The discussion focuses on the relationship between the compressive strength of concrete samples and the expected strength of cured concrete, emphasizing the importance of curing time. It suggests that longer curing times generally lead to increased compressive strength. Participants express confusion over the clarity of the lab question and highlight the need for detailed data analysis, including the impact of various factors such as mix ratio and water/cement ratio on strength. The necessity of plotting compressive strength against cure time and analyzing results is stressed. Overall, the conversation underscores the complexity of factors affecting concrete strength and the importance of thorough reporting in the lab.
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Homework Statement


How does the compressive strength of concrete samples compared to the expected compressive strength of cured concrete. If different explain why.

The Attempt at a Solution



I think the question is asking what is the relationship between time and curing. And I think that the longer you allow the cement to cure there will be an increase in compressive strength..

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The question doesn't make much sense as written. Did you miss out some words?
 
This is the whole lab questions about the concrete lab.

Questions to be addressed in the lab report: 1. Fill in the group data sheet posted in the lab and include this table in your report.
2. Your report should include all data related to the preparation of your concrete, the group data sheet, and any calculations pertaining to these items.
3. Plot compressive strength (y) versus cure time (x) for the two mixtures (on one plot). Add a polynomial trend line for both mixtures.
4. From the class results, comment on how the mix ratio, weight % water, curing time, water/cement ratio, temperature, type of cement used and slump affect concrete’s compressive strength. What was the percent gain in strength between the 7 day and 28 day samples? What causes the difference? In addition, you need to note the fineness modulus of the concrete sand from the sand sieve analysis in rotation A.
5. Be sure to include your observations of the physical properties of the concrete mixtures.
6. How does the compressive strength of the samples compare to the expected compressive strength of cured concrete? If different, explain why.
 
Question 4 asks you to compare the effect of quite a few different variables including the mix ratio. I can't tell from the info provided if they were expecting you to discover anyone sample was stronger or weaker than expected. We're ther any surprises?
 
The longest cured cement was the strongest with compression strength
 
I would expect that but was there a difference between the other variables mentioned in Q4? Does adding more cement always make it stronger?
 

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