| In 1824 Joseph Aspdin, a British bricklayer turned builder, patented a chemical process for making portland cement which was an important advance in the building trades. |
| We drove from Los Angeles for three days to reach Portland, whereupon I flew back down here to go to work. |
| They were portland cement concrete, masonry blocks and paving stones. |
| In the 20th century, portland cement came into common use and concrete foundations allowed carpenters to do away with heavy timber sills. |
| Most of the images obtained are for hydrating portland cement pastes, with a few data sets representing hydrating Plaster of Paris and a common building brick. |
| He enjoys railroading so much he even works on manufacturing real railcars for Gunderson in Portland. |
