Marvin Whiteman Sr., invented the first power trowel in 1939. Since that time power floats and trowels have been widely used to finish large areas of concrete flatwork. There are many advantages to power troweling. While a cement mason using hand tools can finish approximately 300 to 600 square feet a day, a power trowel […]
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Although flat floors have always been the goal of cement masons, concrete slabs have never been truly flat. For many years this was not a problem because small variations in floor surface were seldom noticed. However, with the advent of VNA (Very Narrow Aisle) technology in warehouses this began to change. VNA technology was an
Pervious concrete has actually been in use for more than 150 years, but since the 1970’s this reputation of this paving process has gained rapidly in popularity. Because of its ability to treat, filter, control and partially contain stormwater runoff, pervious concrete is proving an ecologically friendly alternative to asphalt, impervious concrete and other paving
Cement masons use screeds to bring concrete to finish level, thus, bringing the concrete to grade level. The screeding process creates a slab with an essential “plane” surface. Screed tools may be as simple as a piece of wood or as a complex as a selfpropelled high production machine. Cement masons require a variety of
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When concrete floors do not meet the specifications for their intended use, underlayment or overlayment materials can be very effective solutions. The ability of the cement mason to use the correct materials and application procedures to bring these floors into tolerance for their intended use is critical. In this unit, you will learn how to
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While concrete is a durable and strong structural element, there are many instances in which it is not the best material for a finished surface. The purpose of the concrete surface may require that the material provide a high-traction surface or be resistant to chemicals. Some concrete walls or floors can be enhanced through color
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Some experts suggest that allow the cost of labor and materials in weatherproofing a concrete project amount to less than one percent of the cost of the job, as much as 95 percent of the repair and maintenance costs associated with concrete structures are a result of weathering. While some damage from weathering is bound
Grouting is a process in which grout is used to fill in crevices, fissures and cavities in structural formations. Grouting strengthens these formations and reduces permeability. Using a variety of methods, construction workers inject grout under pressure, filling the void until it meets the design conditions. Read Book 3 / Unit 3 Review “Words You
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Epoxy injection is one of the most widely used methods of structural repair in the construction industry. Epoxy adhesives are the most commonly used adhesives for crack repair, and are usually used through the injection process. Epoxies offer excellent adhesion properties because of relatively low shrinkage during curing, and are also attracted molecularly to a
Shotcrete is a special application of concrete that requires the concrete mixture to be applied to a surface at a sufficient velocity in order to obtain compaction. Shotcrete is normally used for building and repairing vertical and overhead structures. Read Book 3 / Unit 5 Review “Words You Should Know” Watch the videos below: Complete the Shotcrete Quiz
