Award-winning Residential Tower

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The Ten Thousand, a luxurious apartment building in Century City that borders Beverly Hills, was recently recognized as a “Gold Winner” in the category of the Best Multi-family Project from the LA Business Journal‘s Commercial Real Estate Awards.  The Conco Companies were honored to provide concrete services on the 40-story, 483-foot residential tower, which is quickly becoming one of the area’s iconic architectural landmarks.  The developer as well as owner of the $300 million project is Crescent Heights.  The architect is Handel Architects and Shamir Shah Design the interior designer.  Swinerton Builders is the general contractor.

Handel Architects explains that the modern all-glass structure was inspired by the work of 20th-century modernists.  The exterior is composed of four crystalline quadrants and the sloping roofline stands out in sharp contrast to the surrounding flat-roofed buildings.  The façade’s multiple panes of glass are slightly angled away from one another to refract sunlight during the day and transform the tower into an illuminated beacon at night.

Ten Thousand received LEED Gold certification and creates a sustainable living environment.  Offering two and three bedroom residences, each unit has floor-to-ceiling windows and unobstructed site lines that provide panoramic views that span all the way from downtown Los Angeles, to the Hollywood Hills, and the Pacific Ocean.  The building’s lobby and residences feature natural finishes such as titanium travertine from Italy, statuary marble, limestone, grained walnut, and cerused oak.

The building also has an on-site garage with a discreet private entrance to the building and 75,000 sq. ft. of indoor and outdoor amenities and a house staff of 60 to provide 5-Star hotel-style services.  Indoors, residents can enjoy the 75-foot lap pool with underwater speakers, sauna and steam rooms, a massage and spa treatment room, and fitness center.  The outdoor area includes a great lawn, sunning pool and spa, tennis court, strolling gardens, chef’s kitchen, a theater with an 84-foot screen and a fire pit as well as a dedicated dog-run lawn.

The Conco Companies are one of the foremost suppliers of concrete services for the Western U.S. We got our start in 1959 in the Bay Area by offering clients the best value on a broad range of concrete services and products.  Since that time, we have taken a leading role as top concrete contractors in the region. We have four regional offices serving California, Oregon, Nevada, Colorado and Washington.

 

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The Importance of Curing Concrete Properly

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At The Conco Companies, we have experience placing any type of concrete for a broad range of projects and in a variety of weather conditions.  Our crews use several different methods for curing concrete as it is determined by the type of construction and the concrete mix as well as outside temperatures and humidity.  Other considerations include project specifications and/or parameters of the jobsite.  However regardless of the technique used for curing, it is important to keep the concrete moist and prevent further loss of moisture.

The Portland Cement Association explains that the purpose of curing is to provide the “adequate amount of moisture for continued hydration and development of strength, volume stability, resistance to freezing and thawing, and abrasion and scaling resistance.”  When we control the rate and amount of moisture the concrete loses during cement hydration, it is allowed to achieve its optimal strength and durability.

Curing is done at the jobsite once the concrete is placed and finished, or during the manufacturing of concrete products.   While curing may only take a few days, the concrete requires a number of days or in some cases weeks or months to attain its full strength and durability.

Preventing the loss of moisture during curing is done in a number of ways.  One method leaves the formwork in place and/or covers the concrete with an impervious paper, plastic sheeting or a membrane-forming compound.  Another includes spraying (or fogging), ponding or using wet coverings to cool the concrete as the water evaporates.

The American Concrete Institute (ACI) recommends a curing period of a minimum of 7 days or until 70% of the specified compressive strength is achieved for most concrete structures in temperatures 40º F and above.  If desired an accelerant can be used to speed up the hardening process and reduce the curing period to only 3 days if temperatures are above 50º F.  Other variables are determined by the size and shape of the structure and strength requirements as well as the type of weather conditions the concrete will be exposed to during its life-cycle.

The Conco Companies are one of the leading concrete contractors in the Western U.S. and offer a wide range of quality services and products.  Our experience includes providing services for commercial, educational, parking and other construction development as well as public works projects.  We serve California, Washington State, Oregon, Colorado and Nevada.

Source: cement.org/for-concrete-books-learning/concrete-technology/concrete-construction/curing-in-construction, concrete.org/TopicsinConcrete/TopicDetail.aspx?id=25&Search=Curing

 

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New Fixes for Concrete Spalling

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Concrete spalling and cracking, sometime referred to as concrete cancer, is caused by rebar corrosion and can affect buildings and other concrete structures.  Once the steel reinforcing in a concrete slab begins to rust, the steel rust can expand up to 7 times its original size and results in concrete being displaced and getting flakey.  As the steel pushes the concrete away, it allows more water to come into contact with the steel and compounds the problem.

Visible rust stains on the outside of the concrete or leaking, bubbling up stains from within the concrete are probably all signs of concrete spalling and can be a dangerous.  The spalling can cause chucks of concrete to separate from a building or bridge and becomes a real hazard to any pedestrians or traffic passing by below.

The good news is that a group of researchers at the University of British Columbia in Canada may have found a cure for concrete cancer.  According to their study, they have gotten good results with producing concrete using discarded glass.  The researchers report that “by partially replacing cement with polymer, fly ash and glass powder, we were able to produce concrete that was more than 60% stronger than what was previously believed possible.”  They are looking to further test their products but hope to eventually replace up to 25% of traditional cement materials, mined from the earth with recycled glass.

One of the authors of the report, Shahria Alam, an associate professor of engineering at the University, explains that millions of tons of glass bypass recycling centers and end up in North American landfills.  Their goal was to make smarter and “greener” building materials without having to take new resources out of the ground.

At The Conco Companies, we are one of the leading concrete contractors in the Western U.S. and offer a wide range of quality services and products.  Our experience includes providing services for commercial, educational, parking and other construction development as well as public works projects.  We serve California, Washington State, Oregon, Colorado and Nevada.

Source: remedial.com.au/structural-repairs/concrete-cancer

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Reactive Powder Concrete

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Reactive Powder Concrete (RPC), which is also known as Ultra-High Performance Concrete (UHPC), is a combination of portland cement, silica fume, quartz flour, fine silica sand, high-range water reducer, water, and optional additives.  The Portland Cement Association explains that reactive powder concrete is “extremely workable, durable and yields ultra-high strengths without using coarse aggregates. Reaching compressive strengths of 30,000 pounds per square inch (psi), this new-age concrete also has tensile strength with the inclusion of steel and synthetic fibers.”   The micro structure of RPC is optimized by precise graduation of all particles in the mix to give it maximum density.

An article on the Concrete Portal website explains that Reactive Powder Concrete (RPC) is “a developing composite material that will allow the concrete industry to optimize material use, generate economic benefits, and build structures that are strong, durable, and sensitive to environment.”  When researchers compare the physical, mechanical, and durability properties of RPC to HPC (High Performance Concrete), studies show RPC offering “better strength (both compressive and flexural) and lower permeability compared to HPC.”

HPC is designed to be more durable and sometimes stronger than conventional concrete and is a mixture of cement, water, and aggregate as well as mineral components and chemical admixtures with specific characteristics.  Achieving its maximum compressive strength, the coarse aggregate in the HPC prevents it from going further.  In the case of RPC, the coarse aggregate is removed to provide the concrete with an even better compressive strength.  Along with very fine powders of cement, sand, quartz powder and silica fume, a RPC mix may contain steel fibers and a superplasticizer.

RPC was developed by P. Richard and M. Cheyrezy and first produced in the early 1990s in France at the Bouygues’ Laboratory.  The first project to use RPC was the Sherbrooke Bridge, a pedestrian bridge in Canada.

At The Conco Companies, we are one of the leading concrete contractors in the Western U.S. and offer a wide range of quality services and products.  Our experience includes providing services for commercial, educational, parking and other construction development as well as public works projects.  We serve California, Washington State, Oregon, Colorado and Nevada.

Sources:cement.org/designaids/emerging-trends, theconcreteportal.com/reac_pow.html

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Fiber Reinforced Concrete

 

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Fiber reinforced concrete (FRC), a type of reinforced concrete that uses a fibrous substance to increase structural strength, durability and ductility, is a subject of new research and developments.  In FRC, short, discrete fibers are uniformly distributed and randomly oriented to provide a kind of three-dimensional stability and include fibers made of steel, glass and synthetic or natural material.  Depending on which material is used, they offer varying properties and characteristics.

For example steel fibers can increase the structural strength of concrete and reduce the steel reinforcement requirements as well as crack widths for better durability.  Also the addition of steel fibers to a concrete mix can improve impact along with abrasion-resistance and freeze-thaw resistance.

Using polypropylene or nylon fibers in concrete can improve the mix cohesion and freeze/ thaw resistance and make concrete easier to pump long distances.  Furthermore, the fibers provide an increased resistance to plastic shrinkage during curing and improve the structural strength and ductility.  As with steel fibers, polypropylene and nylon fibers reduce the steel reinforcement requirements.

Sometimes a construction project will use both steel and polymeric fibers to get the benefit of structural strength provided by steel fibers and the “resistance to explosive spalling and plastic shrinkage improvements provided by polymeric fibers.”  After testing to ensure minimum requirements are met, some precast applications and industrial flooring use steel or synthetic fibers in place of rebar in reinforced concrete.

While fiber reinforced concrete has been around for centuries such as horsehair in mortar, straw in mudbricks, and the use of asbestos fibers during the 1900s, there are new developments and innovations in FRC.  One example is High-performance Fiber Reinforced Concrete (HPFRC), which researchers claim to be 500 times more resistance to cracking and 40 percent lighter than traditional concrete.  More research is being done to validate the claims.

Another recent study used carpet waste fibers in concrete as a way to environmentally recycle carpet.  Also a new trend that completely changes our view of concrete as an opaque mass is to add optical fibers to the mix to create a translucent concrete.

At The Conco Companies, we are one of the leading concrete contractors in the Western U.S. and offer a wide range of quality services and products.  Our experience includes providing services for commercial, educational, parking and other construction development as well as public works projects.  We serve California, Washington State, Oregon, Colorado and Nevada.

Source: en.wikipedia.org/wiki/Fiber-reinforced_concrete

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Time and Cost-saving Trends in Concrete Construction

 

 

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At The Conco Companies, we make it a point to stay up-to-date on the latest concrete news and innovations, and implement new ideas and technologies designed to save our customers time and money as well as to create a better finished product.  Some emerging trends in concrete that are changing concrete design and construction include high strength / high performance concrete (HSC/HPC); self-consolidating concrete (SCC); fiber reinforced concrete (FRC) polymer modified concrete (PMC); high volume flyash concrete (HVFC); reactive powder concrete (RPC); and self-healing concrete / bacterial concrete.

Innovations in precast concrete, which is produced by casting concrete in a reusable mold or “form” and cured in a controlled environment before being transported to the jobsite include  the manufacturing of ultralite panels using Carbon Cast.  This precast concrete technology uses carbon-fiber grid reinforcing to create panels that weigh less and result in reduced shipping, erection and substructure costs.

The Portland Cement Association cites the new P.O.S.T. (Prestressed Open Space Truss) as providing a “solution for long-spans, while maintaining the shallow floor depth of a flat plate system.”  They say the system works well for hotel and condominium applications, especially for those constructed with lower level parking.

The National Ready Mix Concrete Association states that self-consolidating concrete is another time and labor saver as it “pumps easier, fills complex shapes, produces pristine finishes and encapsulates congested reinforcement.”  They explain that the two important properties specific to SCC in its plastic state are its flowability and stability.  This is typically accomplished by using high-range water-reducing admixtures, not by adding more water.

Insulated Concrete Form (ICF) walls are also increasingly becoming a popular option in residential and commercial markets and offer the advantage of fast construction, energy savings and increased durability.  The walls provide occupants not only a quieter environment but a safer one as studies show improved “results for resistance to catastrophic loadings, including fire, wind, and tornados.”

Conco’s mission is to be the best supplier of concrete services in the Western United States and to bring expertise, experience and quality to each project.  We continue to upgrade and expand facilities to better serve the growing market for public works projects, commercial, parking structures, educational, and other construction development. We serve California, Washington State, Oregon, Colorado and Nevada.

Sources:

slideshare.net/sabnisajit/an-overview-of-emerging-trends-in-construction-technologies

cement.org/designaids/emerging-trends

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Concrete Pumps Available Along the West Coast

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The Conco Companies have owned and operated one of the largest concrete pumping companies in the United States for over 40 years.  To remain a leader, we continue to invest in new concrete pumps to provide customers one of the most modern, state-of-the-art operations on the West Coast.

To serve our customers, we have a large fleet of concrete pumps that are located in Northern California, Southern California and Washington.  Our pumps are manufactured by two of the top names in the industry.  Putzmeister America, Inc. is the North American division of one of the most recognized and respected manufacturers of concrete and material placing equipment.  Schwing America is a member of the SCHWING Group, a worldwide designer, manufacturer and distributor of premium concrete production and handling equipment that is headquartered in Herne, Germany.

All three of our pump locations have a Schwing 58SX long boom concrete pump that meets the latest emissions standards and is helping to reduce emissions at our jobsites.  With a 4-Section Overhead Roll and Fold, the innovative boom design works well on bridges, commercial and industrial work and has a reach of 175 feet. The versatile boom has a main section that articulates 180-degrees, which allows it to be angled away from the pour and then guided horizontally into enclosed areas, positioned vertically for elevated work, and stretched out over the cab for flatwork.

Another impressive pump we have available in all locations is the Putzmeister 36Z.  With its detachable Putzmeister Z-Fold boom, the 36Z has great reach.  It is the only four-section, 116-foot 10-inch boom on the market using X-style outriggers. The powerful pumping performance with a small footprint makes it perfect for restrictive job sites.

Please see our website, iPhone App or Android App for access to a complete list of our concrete pumps along with descriptions, diagrams, specifications and instructions for ordering.

Conco’s mission is to be the best supplier of concrete services in the Western United States and to bring expertise, experience and quality to each project.  We continue to upgrade and expand facilities to better serve the growing market for public works projects, commercial, parking structures, educational, and other construction development. We serve California, Washington State, Oregon, Colorado and Nevada.

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