Exam 7: Development of Concrete Block

______ is seldom used any more to make lightweight concrete block due to the high cost of importing it.

Joseph Gibbs's cast his block in a mold, but the mold had dividers, so the finished block _____ .

Concrete block is a very durable building material.

Compressive strength based on net cross-sectional area is required to be at _____ psi for individual Chapters and _____ psi for the average three Chapters.

Today, _____ block can be made on a single machine in a 10-hour day.

Early concrete masons combined quick lime and moist sand, placed the mixture in a mold under pressure, and cured it with steam to make a usable block.

Block names can be determined by the design itself or can be a description of the block's function in construction.

Lightweight aggregates used in block making today include expanded fly as, expanded shale, expanded clay, expanded slag, and expanded slate.

Sound _____ is the measure of the loss of sound between two points.

_____ are U-shaped and hollow in the center but have a solid bottom and are similar to a bond beam block with the exception that they have a greater amount of void to be filled with concrete.

______ block are designed and made with a rounded corner edge so it will not chip easily and are very popular on interior commercial walls where there is a lot of people traffic.

By 1924, the automatic-tamping machine could produce _____ block a day.

With two workers, the hand-tamping process of making block could produce about 500 block per day.

Block sizes are expressed as _____ sizes, which means that each dimension includes the mortar joint.

_____ are sand and pea gravel or some inorganic substitute particles mixed with portland cement to form a concrete block.