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January 27th, 2019 01:00 PM #121
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January 28th, 2019 08:30 PM #122
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February 1st, 2019 01:40 PM #123
Masters, please help me translate concrete mix (M20) or 1-1.5-3 using bags of cement. This is what the foreman is familiar with. According to him, sobrang tibay na raw ng 1-2-3 using cement bag volume, not sure if the concrete ratio guide pertains to volume or weight kasi. Thanks.
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February 1st, 2019 03:25 PM #124
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February 1st, 2019 03:59 PM #125
What's the concrete strength required? 3000psi? Stick w/ 1:2:3 by volume & keep water content at a minimum. The amount of water used to mix is a vital factor in determining the final strength of concrete. Use the least to get a workable mix.
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February 1st, 2019 04:05 PM #126iba talaga pag engineer. Ang dami kailangan pag-aralan na sukat at bigat. Calculado talaga. Bakit pag licensure exam eh ang foucs puro sa mga attorney. Di ba dapat sa mga engineer kasi sila kumakalkula ng buidlings.
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February 1st, 2019 06:36 PM #127
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February 1st, 2019 07:26 PM #128
20Mpa is a tad under 3000psi. The 1:2:3 mix will yield above that if controlled well. Note that plant-batched concrete will be more precisely portioned by weight. For DIY mixes, it might be a challenge to do mass portioning, hence, volume is tolerated. To check mix & moisture content consistency, do the slump test.
Concrete Slump Test - Tutorial - YouTube
You may devise your own version of the 12" test cone. The lesser the slump, the stronger the yield.
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February 1st, 2019 07:30 PM #129For 1:2:3 workable mix you can get 4000-5000 psi. You can try 1:3:4 for 3000-3500psi. Sometimes on sacks method not all are filled equally. Like what trav said water is a major factor for concrete strength.
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February 1st, 2019 07:31 PM #130
Won't that consistency be difficult to manage if I don't have a concrete vibrator?
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