Unit has only batched 27, yards and is in like new condition. Unit features a Sicoma MAO twin shaft mixer mounted on a portable trailer. Producing 8 cubic yards per 90 second cycle, the portable RCC Mixer is capable of producing up to yards per hour. Standard features include air brakes, turn signals, 5th wheel, and removable bolt on expanded work platform for access to the motor, control center, pumps, and mixer.
Etymology[ edit ] The word concrete comes from the Latin word "concretus" meaning compact or condensed the perfect passive participle of "concrescere", from "con-" together and "crescere" to grow. Prehistory[ edit ] Small-scale production of concrete-like materials dates to BC, pioneered by the Nabataea traders or Bedouinswho occupied and controlled a series of oases and developed a small empire in the regions of southern Syria and northern Jordan.
They discovered the advantages of hydraulic lime, with some self-cementing properties, by BC.
They built kilns to supply mortar for the construction of rubble-wall houses, concrete floors, and underground waterproof cisterns. They kept the cisterns secret as these enabled the Nabataea to thrive in the desert.
German archaeologist Heinrich Schliemann found concrete floors, which were made of lime and pebbles, in the royal palace of TirynsGreece, which dates roughly to — BC. Its widespread use in many Roman structuresa key event in the history of architecture termed the Roman Architectural Revolutionfreed Roman construction from the restrictions of stone and brick materials.
It enabled revolutionary new designs in terms of both structural complexity and dimension.
Laid in the shape of archesvaults and domesit quickly hardened into a rigid mass, free from many of the internal thrusts and strains that troubled the builders of similar structures in stone or brick. First, its mix consistency is fluid and homogeneous, allowing it to be poured into forms rather than requiring hand-layering together with the placement of aggregate, which, in Roman practice, often consisted of rubble.
Second, integral reinforcing steel gives modern concrete assemblies great strength in tension, whereas Roman concrete could depend only upon the strength of the concrete bonding to resist tension.
The Baths of Caracalla in Rome are just one example. Many Roman aqueducts and bridges, such as the magnificent Pont du Gard in southern France, have masonry cladding on a concrete core, as does the dome of the Pantheon. Middle Ages[ edit ] After the Roman Empire, the use of burned lime and pozzolana was greatly reduced until the technique was all but forgotten between and the 14th century.
From the 14th century to the midth century, the use of cement gradually returned. The Canal du Midi was built using concrete in This third Eddystone Lighthouse pioneered the use of hydraulic lime in concrete, using pebbles and powdered brick as aggregate.
His son William continued developments into the s, earning him recognition for the development of "modern" Portland cement.
The first concrete reinforced bridge was designed and built by Joseph Monier in . Composition[ edit ] Many types of concrete are available, distinguished by the proportions of the main ingredients below.
Home» Types of Concrete» Self-Compacting Concrete. Self-Compacting Concrete. For a delivery of high quality self-compacting concrete, look no further than The Concrete Network – the largest network of concrete suppliers operating throughout the ashio-midori.comon: 47/49 BURROWFIELDS INDUSTRIAL ESTATE, WELWYN GARDEN CITY, AL7 4SS. At Saudi Readymix we ensure that we deliver the highest standards of service to our clients before the pour, during the pour and after the pour. Our unparalleled service is achieved through a unique supply chain management system. The CSH was established in late to better understand the sustainable attributes of concrete and the areas where they can be improved, and develop scientific breakthroughs at the atomistic level to make cement and concrete even more sustainable into the future.
In this way or by substitution for the cementitious and aggregate phases, the finished product can be tailored to its application. Strength, density, as well as chemical and thermal resistance are variables. Aggregate consists of large chunks of material in a concrete mix, generally a coarse gravel or crushed rocks such as limestoneor granitealong with finer materials such as sand.
Cementmost commonly Portland cementis associated with the general term "concrete. One of the most familiar of these alternative cements is asphalt concrete. Other cementitious materials, such as fly ash and slag cementare sometimes added as mineral admixtures see below — either pre-blended with the cement or directly as a concrete component — and become a part of the binder for the aggregate.
To produce concrete from most cements excluding asphaltwater is mixed with the dry powder and aggregate, which produces a semi-liquid slurry that can be shaped, typically by pouring it into a form.
The concrete solidifies and hardens through a chemical process called hydration. The water reacts with the cement, which bonds the other components together, creating a robust stone-like material. Chemical admixtures are added to achieve varied properties.
These ingredients may accelerate or slow down the rate at which the concrete hardens, and impart many other useful properties including increased tensile strength, entrainment of air and water resistance. Reinforcement is often included in concrete. Concrete can be formulated with high compressive strengthbut always has lower tensile strength.
For this reason it is usually reinforced with materials that are strong in tension, typically steel rebar.
Mineral admixtures have become more popular over recent decades. The use of recycled materials as concrete ingredients has been gaining popularity because of increasingly stringent environmental legislation, and the discovery that such materials often have complementary and valuable properties.
The most conspicuous of these are fly asha by-product of coal-fired power plants ; ground granulated blast furnace slaga byproduct of steelmaking ; and silica fumea byproduct of industrial electric arc furnaces. The use of these materials in concrete reduces the amount of resources required, as the mineral admixtures act as a partial cement replacement.
This displaces some cement production, an energetically expensive and environmentally problematic process, while reducing the amount of industrial waste that must be disposed of. Mineral admixtures can be pre-blended with the cement during its production for sale and use as a blended cement, or mixed directly with other components when the concrete is produced.The CSH was established in late to better understand the sustainable attributes of concrete and the areas where they can be improved, and develop scientific breakthroughs at the atomistic level to make cement and concrete even more sustainable into the future.
Self-compacting concrete (SCC) Concrete that is able to flow under its own weight and completely fill the formwork, even in the presence of dense reinforcement, without the need of any vibration, whilst maintaining homogeneity.
Specification & Guidelines for Self-Compacting Concrete 5 Filling ability (unconfined flowability) The ability of SCC to flow into and fill completely all spaces within the formwork, under its own weight.
Concrete, usually Portland cement concrete, is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens over time—most frequently a lime-based cement binder, such as Portland cement, but sometimes with other hydraulic cements, such as a calcium aluminate ashio-midori.com is distinguished from other, non-cementitious types of concrete.
Self-consolidating concrete or self-compacting concrete (commonly abbreviated to SCC) is a concrete mix which has a low yield stress, high deformability, good segregation resistance (prevents separation of particles in the mix), and moderate viscosity (necessary to ensure uniform suspension of solid particles during transportation, placement.
The only layer that is absolutely required is the subgrade—you have to have ground to place a slab on ground on top of. If the natural soil is relatively clean and compactable, then you can put a slab right on top of it without any extra layers.