The pilot instructed the runway repair technicians to move their equipment so that he could depart from the closed runway that was NOTAM'd as such by the airport operator. The pilot/owner then took off downwind. Later, the pilot returned in the accident airplane and the technicians were surprised when the airplane "committed" to landing downwind on the closed runway. The technicians quickly moved their equipment from the runway surface but the pilot was unable to stop the airplane before striking the left wing against a construction vehicle off the left side of the runway, which resulted in substantial damage. In interviews with Federal Aviation Administration inspectors, the pilot did not report any mechanical deficiencies with his airplane that would preclude normal operation. According to NTSB records, this was the pilot's fourth accident in the previous 3 years.