Lime is the standard treatment for the fat, sticky clay that sits under most of the Houston area. Mixed into the soil, it stops the clay from swelling and shrinking, dries out wet ground, and turns gumbo into a firm, workable layer you can build on. Hasten supplies lime that goes on dry from pneumatic trucks, with water added behind the spread.
Tell us the job and the soil report.
Much of the Houston area sits on clay with a high plasticity index. It swells when it gets wet, shrinks and cracks when it dries, and turns to slick mud under equipment after a rain. Builders call it gumbo. Put a slab, a parking lot or a road on it untreated and it moves.
Lime changes the clay itself. Within hours, calcium from the lime crowds onto the clay particles and they clump into a crumbly, silt-like texture that is far less sticky and swells much less. Over the following weeks, the lime keeps reacting with silica and alumina in the clay and the treated layer gains real strength.
The clay goes from sticky to crumbly and becomes much easier to mix, grade and compact.
Quicklime takes up water as it reacts and gives off heat, so soggy ground gets workable sooner.
The slow reaction between lime and clay keeps going, turning the treated layer into a stiff working platform.
| Quicklime | Hydrated lime | |
|---|---|---|
| What it is | Calcium oxide, straight from the kiln | Quicklime already reacted with water, a fine dry powder |
| Lime per ton | More. Roughly a third more usable lime per ton than hydrated | Less per ton, so the dose by weight is higher |
| On wet ground | Best choice. It reacts with water in the soil and gives off heat | Does not dry the soil the way quicklime does |
| Handling | Caustic and reacts hot with water. Crews need full protective gear | Still caustic, but no heat. Dustier and lighter |
Your soil report states the lime content as a percent of dry soil weight, and it usually says which form it assumed. If it was written for hydrated lime and you want to use quicklime, the engineer converts the dose. Do not swap pound for pound.
Hasten lime is spread dry with water behind it. If a spec calls for a wet application method, talk to the engineer about dry placement before the job starts, because many specs allow both.
Looking for a lower-cost lime source? On some jobs lime kiln dust does the same work at a lower cost, with a higher dose. See houstonlkd.com for how kiln dust compares.
How Hasten Chemical approaches lime soil stabilization across Texas, on the main site.
The soil report sets it as a percent of dry soil weight, usually found with a pH or lime series test on the actual clay. Fat Houston clay commonly takes a few percent. Do not guess the number from a neighboring job.
Quicklime carries more usable lime per ton and dries wet ground as it reacts, so it is often the better buy. Hydrated lime is easier to handle. The engineer converts the dose if you change forms.
On high-plasticity clay, the first mix only starts the reaction. Letting it sit lets the lime break the clay down so the second mix is uniform and the layer compacts properly.
No. Lime needs clay to react with. Sandy soils with little clay usually need cement instead, and clay with high sulfate needs testing first because lime can make it heave.
No. Hasten lime goes on dry from pneumatic trucks, and the water is added behind the spread on site.
Send the soil report, the area and the start date. We will help confirm the form and the dose.
Call 832-655-7763