In Portland cement concrete (and other hydraulic cement concretes), when the aggregate is mixed together with the dry cement and water, they form a fluid mass that is easily molded into shape. The cement reacts chemically with the water and other ingredients to form a hard matrix which binds all the materials together into a durable stone-like material that has many uses. Often, additives (such as pozzolans or superplasticizers) are included in the mixture to improve the physical properties of the wet mix or the finished material. Most concrete is poured with reinforcing materials (such as rebar) embedded to provide tensile strength, yielding reinforced concrete.
Abstract and concrete are classifications that denote whether a term describes an object with a physical referent or one with no physical referents. They are most commonly used in philosophy and semantics. Abstract objects are sometimes called abstracta (sing. abstractum) and concrete objects are sometimes called concreta (sing. concretum). An abstract object is an object which does not exist at any particular time or place, but rather exists as a type of thing, i.e., an idea, or abstraction. The term 'abstract object' is said to have been coined by Willard Van Orman Quine. The study of abstract objects is called abstract object theory.
The type-token distinction identifies physical objects that are tokens of a particular type of thing. The "type" that it is a part of, is in itself an abstract object. The abstract-concrete distinction is often introduced and initially understood in terms of paradigmatic examples of objects of each kind:
An audio engineer works on the recording, manipulation, mixing, reproduction, and reinforcement of sound. Audio engineers work on the "...technical aspect of recording—the placing of microphones, the turning of pre-amp knobs, the setting of levels. The physical recording of any project is done by an engineer... the nuts and bolts." Many audio engineers creatively use technologies to produce sound for film, radio, television, music, electronic products and computer games. Audio engineers also set up and operate sound reinforcement systems for concert, corporate, theatre, sporting and other events.
Audio engineering concerns the creative and practical aspects of sounds including speech and music, as well as the development of new audio technologies and advancing scientific understanding of audible sound.
The Cal Poly Pomona College of Engineering is the engineering college at California State Polytechnic University, Pomona (Cal Poly Pomona) located in Pomona, California, United States. With over 5,600 undergraduate students (as of fall 2015), it is the largest engineering college in Southern California, the second largest college of engineering in the California State University system, and the seventeenth largest engineering college in the United States. In 2013 U.S. News & World Report ranks Cal Poly Pomona's undergraduate program 14th in the nation (for Master's-granting universities), and mentions that Cal Poly Pomona "has one of the top ranked engineering programs, and graduates roughly 1 of every 14 engineers in the state of California."
Because of the hands-on approach to academics and undergraduate focus, the college of engineering at Cal Poly Pomona is among the most selective engineering colleges in the nation and most of its departments are currently declared impacted (hold stringent standards for admissions). For fall 2015, the college admitted 45.3 percent of its total freshmen applicants who held an average unweighted GPA of 3.72 (out of 4.00) and SATs of 1178 (out of 1600), making the college admissions process statistically comparable to the University of California campuses at Davis, Irvine, and Santa Barbara.
... being a world leader in designing and building gas turbine engine testing facilities ... MDSAero designed this $155 million facility – which is the area of a football field and five storeys high with concrete walls that are 10 feet thick – for them to test their aircraft engines.
As the tunnel-boring machine makes its way under the South Bay, those above will not be aware of its movement, the engineers said ...Concrete liners reinforce the tunnel in the process which engineers say is far safer than the former practice of digging out un-reinforced trenches underground.
Schwing, committed to supporting its customers’ success, excels in producing high quality concrete equipment used in even the most demanding construction applications, through innovative engineering, premier manufacturing, and optimum after-sales support.
During the Cold War, east bloc countries produced a stagnant economy and a culture that was as bland as a concrete block apartment. They also produced their share of scientists, engineers and technologists, because many students were smart enough to avoid the political snake pit of law, literature and political science.
So when the St ... Now a centennial celebration is set to honor that first yellow-painted steel span renamed in 1949 and the arching 1994 concrete replacement that crosses the same piece of river — the Acosta Bridge. The bridge was deemed an engineering marvel and the first lift bridge in Florida ... Elmo W. Acosta ... "...
He felt like a kid again. “I did this 30 years ago and it's hard to believe it's been that long and to get back in there, it felt unreal," he said Thursday ... 18-19 ... It didn't Gordon long to rev up the engines and sending dirt chunks flying toward the concrete wall inside the track he dreamed about as a teen ... I've put it off for way too long ... .
Omaha’s urban park changed the city once. What will happen this time? ... The objective for both construction projects ... S.J. MELINGAGIO, The World-Herald ... Redefining downtown ... 1970 ... W ... After most construction was complete, engineers decided the bridge was unsafe and needed modification." Mark Lordemann sandblasts the concrete side of the bridge in this photo ... .
Marty Shukert spent many of his teenage days grinding meat and loading boxes in a gritty part of downtown Omaha called Lower Douglas... Marty Shukert in 1982 ... +7 ... * * * ... * * * ... Aug ... After most construction was complete, engineers decided the bridge was unsafe and needed modification." Mark Lordemann sandblasts the concrete side of the bridge in this photo ... .
He felt like a kid again. “I did this 30 years ago and it’s hard to believe it’s been that long and to get back in there, it felt unreal,” he said Thursday ... 18-19 ... It didn’t Gordon long to rev up the engines and sending dirt chunks flying toward the concrete wall inside the track he dreamed about as a teen ... ___ ... Source .
Researchers have used precariously-balanced rocks to set the formal design earthquake motions for a major existing engineered structure -- the Clyde Dam, the largest concrete dam in New Zealand. <!-- more --> ... .
Just like it’s supposed to be. Just like normal ... With an investment of $16 million-plus, much of it from the state and from federal disaster sources, the new trail is engineered to withstand such punishment. An 18-inch-thick concrete wall and boulders the size of cars and pickups now provide stability ... There was no engineering,” Larson said ... OUR VIEW ... .
An unusual rewilding mission is under way just off the M5 motorway... It is one of the planet’s most mysterious wildlife migrations ... “You see this incredible human engineering construction, massive lump of concrete, steel doors, all around controlling water ... Across Europe in the 20th century, leaky wooden structures were replaced by concrete and steel ... .