|2000-2001 Handbook Contents...||UMSL Govt. Docs...||UMSL Libraries...||UMSL Home...|
Cement Masons, Concrete Finishers, and Terrazzo Workers
Nature of the Work | Working Conditions | Employment | Training, Other Qualifications, and Advancement | Job Outlook | Earnings | Related Occupations | Sources of Additional Information
Cement masons, concrete finishers, and terrazzo workers all work with concrete, one of the most common and durable materials used in construction jobs. Once set, concretea mixture of Portland cement, sand, gravel, and waterbecomes the foundation for everything from decorative patios and floors to huge dams or miles of roadways.
Cement masons place and finish the concrete. They may also color concrete surfaces, expose aggregate (small stones) in walls and sidewalks, or fabricate concrete beams, columns, and panels. In preparing a site for placing concrete, cement masons first set the forms for holding the concrete to the desired pitch and depth and properly align them. They then direct the casting of the concrete and supervise laborers who use shovels or special tools to spread it. Masons then guide a straightedge back and forth across the top of the forms to "screed," or level, the freshly placed concrete. Immediately after leveling the concrete, masons carefully smooth the concrete surface with a "bull float," a long-handled tool about 8 by 48 inches that covers the coarser materials in the concrete and brings a rich mixture of fine cement paste to the surface.
After the concrete has been leveled and floated, concrete finishers press an edger between the forms and the concrete and guide it along the edge and the surface. This produces slightly rounded edges and helps prevent chipping or cracking. They use a special tool called a "groover" to make joints or grooves at specific intervals that help control cracking. Next, finishers trowel the surface using either a powered or a hand trowel, a small, smooth, rectangular metal tool.
Sometimes, cement masons perform all steps of laying concrete, including the finishing. As the final step, masons retrowel the concrete surface back and forth with powered and hand trowels to create a smooth finish. For a coarse, nonskid finish, masons brush the surface with a broom or stiff-bristled brush. For a pebble finish, they embed small gravel chips into the surface. They then wash any excess cement from the exposed chips with a mild acid solution. For color, they use colored premixed concrete. On concrete surfaces that will remain exposed after forms are stripped, such as columns, ceilings, and wall panels, cement masons cut away high spots and loose concrete with hammer and chisel, fill any large indentations with a Portland cement paste and smooth the surface with a rubbing carborundum stone. Finally, they coat the exposed area with a rich Portland cement mixture using either a special tool or a coarse cloth to rub the concrete to a uniform finish.
Throughout the entire process cement masons must monitor how the wind, heat, or cold effects the curing of the concrete. They must have a thorough knowledge of concrete characteristics so that by using sight and touch they can determine what is happening to the concrete and take measures to prevent defects.
Terrazzo workers create attractive walkways, floors, patios, and panels by exposing marble chips and other fine aggregates on the surface of finished concrete. Much of the preliminary work of terrazzo workers is similar to that of cement masons.
Attractive, marble-chip terrazzo requires three layers of materials. First, cement masons or terrazzo workers build a solid, level concrete foundation that is 3 to 4 inches deep. After the forms are removed from the foundation, workers add a 1-inch layer of sandy concrete. Before this layer sets, terrazzo workers partially embed metal divider strips into the concrete wherever there is to be a joint or change of color in the terrazzo. These strips separate the different designs and colors of the terrazzo panels and help prevent cracks. For the final layer, terrazzo workers blend and place into each of the panels a fine marble chip mixture that may be color-pigmented. They then hand trowel each panel until it is level with the tops of the ferrule strips. While the mixture is still wet, workers toss additional marble chips of various colors into each panel and roll a lightweight roller over the entire surface.
When the terrazzo is thoroughly dry, helpers grind it with a terrazzo grinder, which is somewhat like a floor polisher, only much heavier. Slight depressions left by the grinding are filled with a matching grout material and hand troweled for a smooth, uniform surface. Terrazzo workers then clean, polish, and seal the dry surface for a lustrous finish.
Concrete or terrazzo work is fast-paced and strenuous and requires continuous physical effort. Because most finishing is done at floor level, workers must bend and kneel a lot. Many jobs are outdoors and work is generally halted during inclement weather. The work, either indoor or outdoor, may be in areas that are muddy, dusty, and dirty. To avoid chemical burns from uncured concrete and sore knees from frequent kneeling, many workers wear kneepads. Workers usually wear water-repellent boots while working in wet concrete.
Cement masons, concrete finishers, and terrazzo workers held about 139,000 jobs in 1998; terrazzo workers accounted for a very small proportion of the total. Most cement masons and concrete finishers worked for concrete contractors or for general contractors on projects such as highways, bridges, shopping malls, or large buildings such as factories, schools, and hospitals. A small number were employed by firms that manufacture concrete products. Most terrazzo workers worked for special trade contractors who install decorative floors and wall panels.
Only about 1 out of 20 cement masons, concrete finishers, and terrazzo workers was self-employed, a smaller proportion than in other building trades. Most self-employed masons specialized in small jobs, such as driveways, sidewalks, and patios.
Cement masons, concrete finishers, and terrazzo workers learn their trades either through on-the-job training as helpers, by attending trade or vocational/technical schools, or through 3-year apprenticeship programs. Many masons and finishers first gain experience as construction laborers.
When hiring helpers and apprentices, employers prefer high school graduates who are at least 18 years old and in good physical condition and who have a drivers license. The ability to get along with others also is important because cement masons frequently work in teams. High school courses in general science, shop mathematics, blueprint reading, or mechanical drawing provide a helpful background.
On-the-job training programs consist of informal instruction from experienced workers in which helpers learn to use the tools, equipment, machines, and materials of the trade. They begin with tasks such as edging and jointing and using a straightedge on freshly placed concrete. As they progress, assignments become more complex, and trainees can usually do finishing work within a short time.
Three-year apprenticeship programs, usually jointly sponsored by local unions and contractors, provide on-the-job training in addition to a recommended minimum of 144 hours of classroom instruction each year. A written test and a physical exam may be required. In the classroom, apprentices learn applied mathematics, blueprint reading, and safety. Apprentices generally receive special instruction in layout work and cost estimating.
Cement masons, concrete finishers, and terrazzo workers should enjoy doing demanding work. They should have pride of craftsmanship and be able to work without close supervision.
Experienced cement masons, concrete finishers, or terrazzo workers may advance to become supervisors or contract estimators. Some open their own concrete businesses.
Employment of cement masons, concrete finishers, and terrazzo workers is expected to grow more slowly than the average for all occupations through the year 2008. In addition to job openings that will stem from the rising demand for the services of these workers, other openings will become available as experienced workers transfer to other occupations or leave the labor force.
The demand for cement masons, concrete finishers, and terrazzo workers will rise as the population and the economy grow. They will be needed to build highways, bridges, subways, factories, office buildings, hotels, shopping centers, schools, hospitals, and other structures. In addition, the increasing use of concrete as a building materialparticularly in nonresidential constructionwill add to the demand. More cement masons also will be needed to repair and renovate existing highways, bridges, and other structures.
Employment growth of cement masons, concrete finishers, and terrazzo workers, however, will not keep pace with the growth of these construction projects. Workers productivity will increase through use of improved concrete pumping systems, continuous concrete mixers, quicker setting cement, troweling machines, prefabricated masonry systems, and other improved materials, equipment, and tools.
Despite expected slow job growth, opportunities for skilled cement masons, concrete finishers, and terrazzo workers are expected to be excellent as the increase in demand outpaces the supply of workers trained in this craft. The pool of young workers, particularly those between the ages of 16 and 24, available to enter training programs will also increase slowly, and many in that group will be reluctant to seek training for jobs that may be strenuous and have uncomfortable working conditions.
Employment of cement masons, concrete finishers, and terrazzo workers, like that of many other workers, is sensitive to the fluctuations of the economy. Workers in these trades may experience periods of unemployment when the level of nonresidential construction falls. On the other hand, shortages of these workers may occur in some areas during peak periods of building activity.
In 1998, the median hourly earnings of cement masons, concrete finishers, and terrazzo workers were $12.39. The middle 50 percent earned between $9.99 and $16.65. The top 10 percent earned over $22.04 and the bottom 10 percent earned less that $7.92. Median hourly earnings in the industries employing the largest numbers of cement masons, concrete finishers, and terrazzo workers in 1997 are shown below:
Earnings for workers in these trades may be reduced on occasion, because poor weather and downturns in construction activity limit the time they can work. Cement masons often work overtime, with premium pay, because once concrete has been placed, the job must be completed.
Many cement masons, concrete finishers, and terrazzo workers belong to the Operative Plasterers and Cement Masons International Association of the United States and Canada, or to the International Union of Bricklayers and Allied Craftsmen. Some terrazzo workers belong to the United Brotherhood of Carpenters and Joiners of the United States. According to the limited information available, average hourly earningsincluding benefitsfor cement masons who belonged to a union and worked full time, ranged between $15.40 and $46.80 in 1998. Cement masons in New York, Boston, San Francisco, Chicago, Los Angeles, Philadelphia, and other large cities received the highest wages. Nonunion workers generally have lower wage rates than union workers. Apprentices usually start at 50 to 60 percent of the rate paid to experienced workers.
Cement masons, concrete finishers, and terrazzo workers combine skill with knowledge of building materials to construct buildings, highways, and other structures. Other occupations involving similar skills and knowledge include bricklayers, form builders, marble setters, plasterers, stonemasons, and tilesetters.
For information about apprenticeships and work opportunities, contact local concrete or terrazzo contractors; locals of unions previously mentioned; a local joint union-management apprenticeship committee; or the nearest office of the State employment service or State apprenticeship agency.
For general information about cement masons, concrete finishers, and terrazzo workers, contact:
An industry employing cement masons, concrete finishers, and terrazzo workers that appears in the 2000-01 Career Guide to Industries: Construction
Last Updated: March 30, 2000
|2000-2001 Handbook Contents...||UMSL Govt. Docs...||UMSL Libraries...||UMSL Home...|