AN ACR MLG FLC LANDS ON A CLOSED SECTION OF RWY 10R AT PIT.

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I ATTEMPTED SLEEP DURING SHORT LAYOVER IN STUFFY HOTEL ROOM WITH NOISY AIR CONDITIONER. ALARM WOKE ME EARLY AM (EVEN EARLIER BY MY BIOLOGICAL CLOCK). FIRST FLT OF DAY WAS TO BE KORF-KPIT. AIRBORNE; I CONTACTED PIT APCH CTL; NOTIFIED CTLR I HAD ATIS INFO; WHICH CALLED FOR ILS APCH TO RWY 28L; LAST 2850 FT CLOSED. CTLR NOTIFIED ME THAT 'INFO NOW CURRENT; VISUAL APCHS TO RWY 0R IN PROGRESS' (SAME RWY; DIFFERENT DIRECTION). THE FO MADE A GOOD; NORMAL APCH TO THE RWY WITH THE GS OTS; THE TWR CLRED US TO LAND; RWY 10R. DURING FINAL APCH; A LOW SUN REFLECTED OFF WHAT APPEARED TO BE THE RWY TOUCHDOWN ZONE MARKINGS IN SAME MANNER AS THE FULL LENGTH RWY MARKINGS (PAINT). MEN AND EQUIP WERE OBSERVED BY ME TO BE WORKING ALONGSIDE THE RWY TOUCHDOWN ZONE AND THE TOUCHDOWN ITSELF WAS CLR OF MEN AND EQUIP. ONE SECOND BEFORE TOUCHDOWN; WE BOTH SAW THAT THE SUN WAS REFLECTING OFF GRAY SHEETS PLACED OVER THE RWY TOUCHDOWN MARKINGS; THE ONLY VISUAL INDICATION THAT THE FIRST 2850 FT OF RWY WAS CLOSED. I ELECTED TO NOT INTERFERE WITH THE LNDG IN PROGRESS BECAUSE I HAD ALREADY VISUALLY CLRED THE RWY; IT WAS OBVIOUS THAT THERE WAS NOTHING OBSTRUCTING THE LNDG; AND THAT TO INTERFERE AT THIS POINT WOULD PROBABLY RESULT IN AN UNCOORDINATED; UNSAFE BOUNCED TOUCHDOWN; FAR MORE HAZARDOUS THAN A NORMAL TOUCHDOWN ON WHAT WAS OBVIOUSLY A CLR RWY; WITH MEN WORKING BEYOND THE RWY PERIMETER. TOUCHDOWN AND ROLLOUT WERE UNEVENTFUL. BEFORE LEAVING THE TWR FREQ; PIT TWR CLRED AN ACFT BEHIND US TO LAND; ADDING THAT THE FIRST 2800 FT OF RWY WAS CLOSED; SOMETHING THE TWR OPERATOR HAD NOT MENTIONED TO THIS FLC. IMMEDIATELY UPON ARR AT GATE; ARR ATIS INFO WAS BEING BROADCAST; MENTIONING THAT THE FIRST 2800 FT RWY 10R WAS CLOSED. CONTRIBUTING FACTORS INCLUDE INADEQUATE SLEEP; EARLY WAKING; NOT LISTENING TO NEW ATIS INFO AFTER INFORMED OF CHANGE BY APCH CTL; AND NO TOUCHDOWN MARKINGS OUT OF ORDINARY SUCH AS A BIG X ON CLOSED PORTION OF RWY; WHICH; EVEN IF REFLECTING THE MORNING SUN; WOULD STILL BE SUFFICIENTLY OUT OF THE ORDINARY TO ALERT PLTS. SUN REFLECTING OFF WHITE PAINT AND GRAY CLOTH MADE FULL LENGTH OF RWY LOOK THE SAME. IF THE APCH CTLR AND TWR OPERATOR WOULD REMIND THE FLC OF EACH ACFT THEY CLR FOR APCH OR LNDG ON A PARTIALLY CLOSED RWY; OF THAT PARTIAL CLOSURE; IT WOULD HELP IMMENSELY. SUPPLEMENTAL INFO FROM ACN 218235. UPON SHUTTING DOWN AND DEPLANING OUR PAXS I DID A THOROUGH WALK-AROUND AND FOUND NO DENTS; DINGS; OR DAMAGE (OR FOD).