
What a Concrete Driveway Job Involves, Start to Finish
Flatwork runs in a fixed order: a read on the soil and likely depth to refusal, the permit application, excavation and subgrade compaction, base course, forms, reinforcement, the pour, the finish, then curing. We hand you that sequence with dates attached, including the 10 business days the city takes to review a permit and the 4:00 p.m. cutoff for a next-business-day inspection. Knowing where the waiting sits keeps a two-week job from feeling stalled.
Expansive Clay Subgrade Under a New Slab
Roughly 41% of the mapped soil under the city is deep smectitic Vertisol, and Houston Black is 54% clay in the surface horizon with a linear extensibility of 12%. That ground swells and shrinks with moisture, and a slab poured over it without compaction, adequate thickness and a deliberate joint plan simply moves with it. A quote that talks only about psi is telling you very little.
Houston Black, Austin and the Shallow Chalk Soils
About 27.2% of the city sits on Houston Black clay and its urban-land complex, while another 32% is shallow carbonatic soil over chalk, with Austin at about 19.3%, Stephen at about 6.4% and Purves at about 4.2%. Houston Black carries a plasticity index of 44 against Austin’s 37, and both exceed the plasticity index of 15 that triggers the expansive-soil provisions of IRC Section R403.1.8.1. We establish which one your address falls on before pricing.
Concrete Driveways and the City Approach
A residential driveway is two jobs wearing one surface: the private portion on your lot, and the drive approach where it crosses into right-of-way and ties into curb and gutter. The approach is the regulated half, carrying a minimum corner clearance of 15 feet, a minimum curb return radius of two and one-half feet, and a bar on new residential approaches onto an arterial unless the lot was platted fronting it.
Drive Approach Permits, Bonds and the Pre-Pour Inspection
Before any curb, approach or gutter on public property is removed or constructed, the city wants an approach permit displayed on site, a $1,000 bond under Code Section 32-119 for drive approach construction, and a $3,000 bond under Section 32-32 for work in streets and public ways. Once the approach is formed we notify the inspections department and wait, because the inspector has one working day to approve or disapprove it.
Concrete Slabs and Pads for Shops, Sheds and RV Parking
Shop floors, shed pads, RV aprons and equipment bases are point-load problems rather than surface problems, so each gets its own thickness, welded wire reinforcement or rebar layout, and control joint spacing, commonly 24 to 36 times the slab thickness. We ask what will park or sit on the pad first, including whether an electrician needs a concrete encased electrode, the Ufer ground, tied in before the pour.
Summer Concrete Placement and the Discharge Clock
Ready-mix arrives on a clock and heat shortens it: once the concrete reaches 90 degrees the state highway standard allows 45 minutes from batching to begin discharging, or 75 minutes with a Type B or D admixture. In a stretch running 101 to 103 degrees with overnight lows of 76 to 77, there is no cool window to shift a pour into. We size loads and staff the finish accordingly.
Concrete gains strength on a curve rather than a switch, and the 28-day compressive strength everyone quotes is a test age, not a waiting period. We give you three separate dates at the pour: when you can walk on it, when a passenger vehicle can park on it, and when a penetrating or film-forming sealer can go down. Those dates move with the weather and the mix.