AI Article Synopsis
- This study examines how adding phosphoric acid (HPO), potassium dihydrogen phosphate (KHPO), and sodium dihydrogen phosphate (NaHPO) affects magnesium oxychloride cement (MOC) in terms of setting time, compressive strength, and water resistance.
- The findings reveal that while these admixtures reduce both the setting time and compressive strength, the MOC still achieves over 30.00 MPa strength when 2.0 wt.% of phosphoric acid is used after 14 days of air curing.
- Moreover, the water resistance of MOC is significantly improved, with a softening coefficient of 1.2 for MOC containing 2.0 wt.% HPO, showing
Article Abstract
This study investigates the effects of phosphoric acid (HPO), potassium dihydrogen phosphate (KHPO) and sodium dihydrogen phosphate (NaHPO) admixtures on the setting time, compressive strength and water resistance of magnesium oxychloride cement (MOC). MOC samples incorporating different admixtures are prepared, and their hydration products and microstructures are studied via X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that the addition of HPO, KHPO and NaHPO reduces the initial and final setting times and decreases the compressive strength. However, the compressive strength of MOC is higher than 30.00 MPa with the addition of 2.0 wt.% phosphoric acid and its phosphate after 14 days of air curing. The water resistance of modified MOC slurries is significantly improved. The softening coefficient of MOC with 2.0 wt.% HPO is 1.2 after 14 days of water immersion, which is 3.44 times higher than that of the neat MOC. The enhancement in water resistance is attributed to the formation of amorphous gel facilitated by HPO, KHPO and NaHPO. Furthermore, the improvement in water resistance is manifested as HPO > KHPO > NaHPO.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11478166 | PMC |
| http://dx.doi.org/10.3390/ma17194828 | DOI Listing |
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