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| Sr. | Term | Definition |
| 1 | Tack Coat | A thin coat of bitumen, road tar or emulsion laid on a road to improve the adhesion of a course above it. |
| 2 | Tandem Roller | A road roller having rolls (drums) of about the same diameter behind each other on the same track. |
| 3 | Tack Weld | A temporary half-inch thick weld that holds steel parts together during fabrication. |
| 4 | Temperature Steel | Reinforcement which is inserted in a slab or other concrete member to prevent cracks due to shrinkage or temperature stresses from becoming too large. It generally amounts to a minimum of about 0.1% of the cross-section in any direction. The requirement for a slab, which is two-dimensional, being therefore about 0.2% altogether. |
| 5 | Temperature Stress | A stress due to temperature rise or drop. If the expansion due to temperature rise or the contraction due to temperature drop is restrained, the member concerned is stressed in compression during rising temperature or tension during falling temperature. |
| 6 | Tendon | A prestressing bar, cable, rope, strand or wire. |
| 7 | Terzaghi-Meyerhoff Equation | This equation is used to find the gross (ultimate) bearing capacity or gross pressure for a soil: |
| 8 | Thrust | A horizontal force, particularly the horizontal force exerted by retained earth. |
| 9 | Topsoil | The topmost layer of the soil which by its humus content supports vegetation. It is usually the top one foot of the soil. |
| 10 | Tolerance | Acceptable variation from a standard size. |
| 11 | Toughness | The resistance of a material to repeated bending and twisting. |
| 12 | Torgue, Torsion Or Twist | The twisting effect of a force on a shaft applied tangentially, like the twist on a haulage drum which winds rope on to its circumference. |
| 13 | Traffic Lane | That portion of a traveled way for the movement of a single line of vehicles |
| 14 | Travel Lane | When used to distinguish between passing lane and travel lane, the travel lane is the right lane of a two lane roadway with both lanes going in the same direction. Usually both the passing lane and the travel lane are considered travel lanes with the passing lane considered to be the right travel lane. |
| 15 | Traveled Way | The portion of the roadway for the movement of vehicles exclusive of shoulders and auxiliary lanes. |
| 16 | Truss | A frame, of steel, but also sometimes of timber, concrete, or light alloy, to carry a roof or bridge, built up wholly from members in tension and compression. It is generally a perfect frame or nearly so, and may be pin jointed. |
| 17 | Turfing | The covering of an earth surface with growing grass cut from another site. It can also be revetment to slopes which are usually covered by water, made by laying turves on the slope according to a technique like sliced blockwork. |
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