How to choose MgO particle size for RCC dams (Delayed-Expansion Technology for Mass Concrete Crack Control)
Keywords：
Magnesium oxide expansive agent
Dam construction crack control
Delayed expansion admixture
Product Introduction
MgO expansion agent products to concrete crack control as the main theme, in consideration of different building structures, construction conditions, different age of the contraction of the basis, follow the principle of compensating for contraction, combined with the light burned magnesium oxide activity can be adjusted performance characteristics of the scientific design of the expansion characteristics of the product, so that the release of the expansion energy and the expansion of the play of time and the contraction of the concrete structure to match, so that the concrete has a good anti-cracking and anti-seepage properties. performance.
Underground buildings: underground parking lot, underground human defense,underground warehouse, underground sidewalk, foundation pit, pile foundationand other projects.
Waterproof structures: reservoir dams, subways, tunnels, water conservancy andhydropower, marine engineering, ports, water plants, power plants, pools andother projects.
Extra-long concrete structure: airport terminal, large square, stadium, theater,plant and other projects.
Q:Can MgO replace shrinkage-reducing admixtures (SRA)?
A: SRAs lower surface tension but don’t actively expand. MgO provides positive volume increase (0.04% min. per ASTM C878) for guaranteed crack closure.
Q:Is special mixing required?
A: No. Directly added to concrete mixer like cement. No viscosity change.
Q:Shelf life and storage?
A:24 months in original packaging (<60% RH). Bulk bags include moisture indicator strips.
Product Parameters
Packed in composite bag, net weight 25kg/bag, shelf life 3 months; need to be stored in a dry and ventilated room, the bag is sealed, pay attention to moisture-proof, anti-freezing.
| Test item | Indicator Requirements | |||
| Type R | Type M | Type S | ||
| MgO content (%) | ≥ | 80.0 | ||
| Loss on burnout (%) | ≤ | 4.0 | ||
| Moisture content/% | 0.3 | |||
| Reaction time (s) | <100 | ≥100 OR <200 | ≥200 OR <300 | |
| Fineness (%) | 80 μm square hole sieve 1.18 mm square hole sieve | 5.0 0.5 | ||
| Restriction on expansion (%) | 20℃水中7d 20℃水中,Δε 40℃水中7d 40℃水中，Δε | ≥0.020 ≥0.020 ≥0.040 ≥0.020 | 0.015 0.015 0.030 0.030 | 0.015 0.010 0.020 0.040 |
| Setting time (min) | Initial coagulation Final coagulation | ≥ ≤ | 45 600 | |
| Compressive strength (MPa) | 7d 28d | ≥ ≤ | 22.5 42.5 | 22.5 42.5 |
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