Handy guide on factors to multiply per cubic on different concrete class mixtures. Just multiply each factor to the total volume (in cubic meter) and you’ll get the needed amount of cement (40Kg/bag), sand (cu.m.) and gravel (cu.m.).
| Class C (2,000 psi) | ||
| Cement | 5.634 | Bags |
| Sand | 0.4794 | cu.m. |
| Gravel | 0.898 | cu.m. |
| Class B (2,500 psi) | ||
| Cement | 7.399 | Bags |
| Sand | 0.486 | cu.m. |
| Gravel | 0.8856 | cu.m. |
| Class A (3,500 psi) | ||
| Cement | 8.799 | Bags |
| Sand | 0.5724 | cu.m. |
| Gravel | 0.856 | cu.m. |
| Class AA (4,000 psi) | ||
| Cement | 11.729 | Bags |
| Sand | 0.475 | cu.m. |
| Gravel | 0.8344 | cu.m. |
The following factors were already added an average wastage add-ons of around 5% to 8%. This numbers should help average Filipinos to know draft amount of materials needed for minor concreting works.
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Why is there a difference in formula? example class AA (1:1.5:3) Fajardo, Tagayun and yours. How did you came up with that multiplier? Correct me if I’m wrong, my elementary math understands ratio of 1:1.5:3 means 1 part cement in cbm : 1.5 part sand in cbm and 3 parts of gravel in cbm. 1 bag of 40 kg cement is 0.02cbm, right? How do we decide which one is correct? Thanks in advance.
Hi John, these factors came from our previous company’s in-situ data which has been passed on to engineers. Yes, those ratio you stated should be correct. In fact, one of our workmate tried to measure how many bags of cement are there in one cubic meter using an improvised 1mx1m box. He came up with 0.0267cbm. We believe factors like how compact the cement is in the box matters. Several factors play with the overall strength of the concrete (aggregate’s quality, w/c ratio, curing etc.). If in the end each [or any of the three guides] came up with the required strength after 28 days, then, that’s the one you should follow. Thank you!
So all of those ratio are correct? If all of ratios are correct, which one is cheaper?
What is the density of cement in the Philippines?
6,000 psi concrete – how many bags of cement?
wastage factor of 5%-8% is rather high. the accepted norm (based on dpwh bidding documents) is 3% maximum only. however, if the preparation of concrete is not strictly monitored, then the 5%-8% wastage factor is acceptable. but then again, the owner should be vigilant when it comes to materials usage; oherwise . . .
Hi Engr. Reginaldo, yes po. We considered low to average skilled workers on this, that is why. Salamat po sa remarks 🙂
DPWH sometimes use 21MPa or 3ksi concrete. Do you have a mixture for that?
We don’t have that data Sir BM. Thank you!
for 21Mpa (3000psi; assuming 1.00 cu.m. volume), it is normally as follows:
cement (40kg bag) = 9.23 bags
sand = 0.52 cu.m.
gravel 3/4″ = 0.49 cu.m.
gravel 3/8″ = 0.34 cu.m.
admixture (superplasticizer G2) = 2.952 lit
water = approx 170-208 liters
I just want to ask why Class A and B have a lower capacity than ClassCC and D?
Hi Sir Bon, the post has been updated. Thank you!
Thanks Philconprices. Is it ok if I ask what is your reference literature for this data?
I’m not very familiar with the classes of concrete but am I reading it correctly that A is 3ksi, B is 2.5ksi (lower than Class A), C is 3ksi and D is 3.5ksi?
Hi Sir BM, Thanks for this comment!