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Index point change ÷ Previous period index level = Proportion of change Proportion of change × 100 = Percent change For example, in the first quarter of 2016, the PPI for final demand increased 0.5 percent because the index levels were 109.7 in March 2016 and 109.1 in December 2015. The percent change is calculated as: 109.7 - 109.1 = 0.6
Self-consolidating concrete or self-compacting concrete (SCC) [1] is a concrete mix which has a low yield stress, high deformability, good segregation resistance (prevents separation of particles in the mix), and moderate viscosity (necessary to ensure uniform suspension of solid particles during transportation, placement (without external compaction), and thereafter until the concrete sets).
Self-leveling concrete was invented in 1952 by Axel Karlsson from Sweden. The first product was a combination of wood glue, fine sand and cement with additives. [1] It was called flytspackel, which directly translates to "floating putty". The term self-leveling can be traced back to a patent applied by the company Lafarge in 1997. [2]
In civil engineering, concrete leveling is a procedure that attempts to correct an uneven concrete surface by altering the foundation that the surface sits upon. It is a cheaper alternative to having replacement concrete poured and is commonly performed at small businesses and private homes as well as at factories, warehouses, airports and on roads, highways and other infrastructure.
CPP and CPR methods, developed over the last 40 years, are used in lieu of asphalt overlays and bituminous patches to repair roads when longer lasting solutions are desired. When installing pavers over top of an existing asphalt of concrete pad, there are three installation options: sand set, bituminous set, and mortar set. [1]
Maxwell Products, Inc. is a privately held, pavement maintenance products manufacturing company based in Salt Lake City, Utah. [1] Founded in 1975 by brothers Ted and Delwyn Maxwell, Maxwell Products manufactures asphalt and concrete pavement preservation products, including Elastoflex crack and concrete joint sealant, NUVO premium crack and concrete joint sealant, GAP Mastic, and GAP Patch.