Hydro demolition vs jackhammering
Select the removal method from the repair specification, concrete condition, reinforcement, access and water-management requirements. Published US studies provide useful historical comparisons, but do not establish current Philippine costs or guaranteed repair life. Dezu delivers robotic and precision hand-lance hydrodemolition.
How do the numbers compare?
| Dimension | Jackhammering | Hydro demolition | Source |
|---|---|---|---|
| Crew + equipment rate (US, 2018, modeled) | USD 577/hr (8-person crew) | USD 590–842/hr (5-person crew + robot) | Ohio DOT/FHWA 2018 |
| Modeled removal cost, 250 sq ft at 4-in depth (US, 2018) | USD 48,100 | USD 4,198–5,281 | Ohio DOT/FHWA 2018, Table 8 |
| Reinforcing steel | Impact damage is a selection and inspection concern | Water-only removal can preserve reinforcement; inspection remains necessary | Conjet method overview |
| Remaining concrete | Impact can create microcracking | Avoids percussive impact; removal parameters and acceptance still require control | Conjet method overview |
These are selected historical modeled figures, not contractor quotations or Dezu production records. The Ohio report uses different flow assumptions across its productivity and cost tables; its published jackhammer duration table also differs from the narrative rate. Do not use these figures as a productivity calculator. Read the PH cost guide for quotation inputs.
Why does the total-cost gap get so large?
Total removal cost depends on more than the hourly equipment rate. The Ohio model combines its assumed production rates with crew, equipment and setup costs. It illustrates how those assumptions affect a selected scope. Actual access, concrete condition, removal depth, interruptions and wastewater arrangements must be assessed for the project being quoted.
When does jackhammering actually win?
Mechanical removal can be appropriate when permitted by the repair specification and supported by the access, equipment and waste-management plan. Small scopes can be sensitive to mobilization costs, but size alone does not decide the method. Compare the complete scope and acceptance requirement rather than assuming either method always wins.
What does this mean for structural repairs?
Define what must remain, what must be removed and how the exposed concrete and reinforcement will be accepted. Hydrodemolition avoids percussive impact, but its parameters and removal boundary still require control. Dezu's delivered structural scopes include an underground railway wall, a railway depot beam and a tilted petrochemical structure: see the delivered projects.
Which is cheaper — hydro demolition or jackhammering?
Compare quotations for the same removal depth, access, containment and acceptance requirement. An Ohio 2018 model estimated lower removal costs for selected hydrodemolition scenarios, but those historical US assumptions do not establish a Philippine price or a universal cost advantage. Mobilization, concrete condition and equipment availability can change the comparison.
Does jackhammering damage reinforcing steel?
Impact removal can damage reinforcement and create microcracking in retained concrete. Water-only hydrodemolition can reduce those impact-related risks when correctly selected and controlled. The repair specification, trial removal and inspection still determine what may be removed and whether the remaining concrete and reinforcement are acceptable.
When is jackhammering the right choice?
Mechanical removal may suit a repair where the specification permits it and access, mobilization, water management and required finish support that choice. Neither method is right for every scope. Ask the responsible engineer to define the removal boundary and acceptance requirements before comparing proposals.
Sources
- Ohio DOT / University of Akron, FHWA/OH-2018-11 (2018) — rosap.ntl.bts.gov
- Conjet, hydrodemolition method and controlled removal — conjet.com
Not sure which side of the crossover your scope falls on?
Send the drawings, removal specification and site constraints. Dezu can review the hydrodemolition scope and the information needed for a quotation.