Materials engineering Concrete

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Discussion Overview

The discussion revolves around the compressive strength of concrete samples in relation to the expected compressive strength of cured concrete. It addresses factors influencing strength, such as curing time, mix ratios, and other variables relevant to a concrete lab report.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant suggests that longer curing times lead to increased compressive strength of concrete.
  • Another participant questions the clarity of the original question, implying it may be poorly phrased.
  • A participant outlines specific questions from the lab report, emphasizing the need to analyze various factors affecting compressive strength.
  • There is a mention of the need to compare the effects of multiple variables, including mix ratio and water/cement ratio, on compressive strength.
  • One participant notes that the longest cured cement exhibited the highest compressive strength.
  • Another participant raises a question about whether increasing the amount of cement always results in stronger concrete, indicating uncertainty about the relationship between cement quantity and strength.

Areas of Agreement / Disagreement

Participants express differing views on the clarity of the original question and the implications of various factors on compressive strength. There is no consensus on whether adding more cement always enhances strength, and the discussion remains unresolved regarding the specific effects of the variables mentioned.

Contextual Notes

Participants highlight the complexity of the relationship between curing time, mix ratios, and other variables, indicating that assumptions about these relationships may not be fully addressed in the discussion.

Who May Find This Useful

Students and professionals interested in materials engineering, particularly those focused on concrete properties and laboratory analysis.

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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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