HNC concrete supplying service always has a concrete casting line for concrete pavers to accurately determine concrete grade according to customers' orders. . This is to ensure the interests of customers. Ensuring longevity as well as enhancing prestige and brand. HNC fresh concrete
The process of mold casting test concrete
1. Purpose of experiments
Concrete marks are the mean value of the compressive strength limits of the 15 cm side-by-side cube samples prepared and maintained for 28 days under standard conditions (t0 = 27 ± 20C, W > 95 %).
Concrete markers are an important indicator used to design concrete mixes.
2. Laboratory instruments
- Set of three sizes (15x15x15cm)
- Small hammer, fly.
- Round iron rod φ16 length 600mm.
- Model compressor.
- Swimming pool and some other accessories.
3. Experimental sequence
- The mold is wiped clean, applying a thin layer of oil to the inside of the mold.
- We take 12 liters of concrete, have fallen to the requirements.
- Put the concrete mixture into 2 layers, 25 layers each over the entire surface of the mold.
- Use a hammer to lightly around the mold for the flowing cement to avoid face basket when removing the mold.
- Use flat surface.
- Labeling (items, sample symbols, molding dates, marks, founders) and household goods.
- After one day in the mold, take the sample for 27 days.
- Take samples for full day of compression testing, the compressed face must be in contact with the mold.
- The compressive strength of each sample is calculated according to the following formula:
Rn = FP (KG / cm2)
P [KN]: destructive force of pattern.
F = 15x15cm: bearing area.
- The results of the experiment to determine the compressive strength of concrete shall be taken as the average of three intensities of the three samples, with the maximum and minimum values not exceeding 15% of the price. Average value of the sample (0.85RTB < RMax (Min) < 1.15RTB).
If the largest and smallest value is not 0.85RTB < RMax (Min) < 1.15RTB, then another pattern must be cast.
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