How do you make a saturated surface-dry?
SSD stands for saturated surface-dry and it describes a condition that a concrete surface must be brought to when a cement product is to be applied to it. The surface is SSD when the substrate is saturated with water, filling the voids in the substrate’s aggregate, but the outer surface is devoid of free water.
What is saturated surface-dry condition?
Saturated surface dry (SSD) is defined as the condition of an aggregate in which the surfaces of the particles are “dry” (i.e., surface adsorption would no longer take place), but the inter-particle voids are saturated with water.
What is saturated surface-dry density?
the mass of the saturated surface-dry aggregate divided by its displacement volume in water.
How do you calculate saturated surface-dry weight?
Simply stated, it is the unit weight of a saturated material divided by the unit weight of water and is computed as follows: Gs(ssd) = (1 + Absorption) x Gs(dry).
What is saturated concrete?
Water-saturated concrete is typically concrete that is damp to the touch with no standing water in the hole. Keep in mind, water-saturated concrete may affect the adhesive’s cure time.
What is ASTM C128?
ASTM C128 : Standard Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate.
How do you calculate surface moisture?
- Moisture States:
- AC = (WSSD – WOD) / (WOD) x 100%
- Effective Absorption:
- EA = (WSSD – WAD) / WSSD x 100%
- Wabs = (EA) Wagg
- Surface Moisture:
- SM = (Wwet – WSSD) / WSSD x 100%
- Wadd = (SM) Wagg
What is the flakiness index?
The flakiness index is defined as the percentage (by mass) of stones in an aggregate having an ALD of less than 0.6 times their average dimension. Flaky aggregates tend to produce seals with less voids due to their tendency to pack more tightly than cubical aggregates, consequently flaky particles require less binder.
What is the meaning of water saturated?
Water Saturation is defined as the ratio of water to pore volume. Moreover, it can be described as the formation of water in an undisturbed zone and the ability of a solid to hold a great amount of water under specific conditions.
What does it mean if something is saturated?
1 : full of moisture : made thoroughly wet. 2a : being a solution that is unable to absorb or dissolve any more of a solute at a given temperature and pressure.
What are fine aggregates?
Fine aggregates are essentially any natural sand particles won from the land through the mining process. Fine aggregates consist of natural sand or any crushed stone particles that are ¼” or smaller. Frequently referred to as washed concrete sand or manufactured sand, C33 refers to the grading or size of the material.
What does the term saturated surface dry mean?
SSD stands for saturated surface-dry and it describes a condition that a concrete surface must be brought to when a cement product is to be applied to it. The surface is SSD when the substrate is saturated with water, filling the voids in the substrate’s aggregate, but the outer surface is devoid of free water.
How to tell if a substrate is saturated or dry?
Saturated, Surface Dry: In order to achieve a proper saturated, surface dry condition it is critical to achieve a substrate that is clearly damp below the immediate surface, has no standing water and has a surface that is showing no signs of a “film” of water on the surface.
What’s the best way to saturate dry grout?
Extreme heat and dry conditions may require a much longer time to become properly saturated. Typical Procedure: Specific jobsite water availability varies however generally installers will use a hose or bucket of water with a mortar brush to dampen the repair substrate for a few minutes.