| Magnetite |
(Concrete Engineering) An aggregate used in heavy weight concrete, consisting primarily of ferrous metaferrite (Fe304). A black magnetic iron ore with a specific gravity of approximately 5.2 and a Mohs hardness of about 6. |
| Neat Cement-Paste |
(Concrete Engineering) A mixture of water and hydraulic cement, both before and after setting and hardening. |
| Pretensioning |
(Concrete Engineering) A method of prestressing reinforced concrete in which the steel is stressed before the concrete has hardened and restrained from gaining its unstressed position by bond to the concrete. |
| Retardation |
(Concrete Engineering) Delaying the hardening or strength gain of fresh concrete, mortar or grout. |
| Rock Pocket |
(Concrete Engineering) Area or portion of hardened concrete which is deficient in mortar and consisting primarily of coarse aggregate and open voids; caused by insufficient consolidation or separation during placement, or both; by leakage from form. |
| Stucco |
(Concrete Engineering) A portland cement mortar material that can be applied to the surface of any building or structure to form a hard and durable covering for the exterior wails or other exterior surfaces. |
| hard-board |
ไม้อัดเป็นแผ่นแข็ง ใช้เป็นวัสดุก่อสร้าง
|
| hard wood |
ไม้เนื้อแข็งเนื้อละเอียดมี น.น.มาก |
| harden surface |
พื้นหน้าดินแข็ง, พื้นที่อันแน่นและแข็ง |
| hard steel |
เหล็กกล้าที่ใช้ทำเหล็กเครื่องมือ |
