Sunday, 1 March 2116

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Tuesday, 12 July 2016

OSHA 10 Hour Construction Training with Free Study Guide


360training.com is an OSHA “ Authorized online provider of the 10-hour Construction Industry Outreach Training Program. Our course is designed to teach an entry level construction worker about workplace safety specifically for the construction industry. Students will learn about:Hazard recognition Avoidance Abatement Prevention In addition to learning about safety and health hazards in the workplace, students will also learn about OSHA, employer responsibilities, and worker rights. OSHA recommends Outreach Training Program courses as an orientation to occupational safety and health for workers to reduce injuries and save lives. Workers must receive additional site specific training where required by OSHA standards. Upon successful completion of the course students will receive an official OSHA/ DOL Wallet card within 6-8 weeks.


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Category: PackageBean


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http://www.gulf-jobs.info/osha-10-hour-construction-training-with-free-study-guide/ #Uncategorized

Sunday, 22 May 2016

Test Post from Gulf Jobs

Test Post from Gulf Jobs http://www.gulf-jobs.info

Friday, 6 May 2016

Segregation and Bleeding

Segregation: Segregation is defined as the separation of the constituents of a homogeneous mixture of concrete. It is caused by the differences in sizes and weights of the constituent particles. Segregation can be controlled by properly choosing the grading of aggregates and by carefully handling wet mixes. In relatively lean and dry mixes, segregation can be caused by the coarser particles separating out because they travel farther along the slope or settle to a greater extent than finer particles. The second form of segregation occurs in very wet mixes in which the cement – water paste separates from the mix. Segregation can also be caused by poor handling, such as dropping wet concrete from a considerable height, passing long chutes along a slope, and discharging concrete carelessly against some firm obstruction. It may also be caused by the vibration of concrete. Though vibration provides a useful means of compaction, over – vibration leads to segregation. This can happen when vibration is allowed to continue for too long. It leads to the separation of coarse aggregates from the mix. These aggregates settle at the bottom, and the cement – water paste moves to the top in the form of laitance (scum). This laitance is different from bleed water. Segregation is difficult to measure. However, its occurrence is easily detected. The flow test can indicate the susceptibility of a mix that is likely to segregate. In dry mixes, heavier particles move away and occupy the edges of the flow table. In wet mixes, the cement paste trends to move away from the middle and the centre of the flow table is left only with coarser particles. Bleeding: Bleeding is also known as ‘water gain’. It is the accumulation of water at the surface, which accompanies the sedimentation of freshly mixed concrete. This happens due to the inability of the solid constituents of the mix to hold all the mixing water and they settle downwards due to gravity and the water moves upwards. Bleeding is expressed quantitatively as the total settlement per unit height of concrete or as the percentage of mixing water. In extreme cases, this can be nearly 20%. Bleeding is a function of (a) air velocity, (b) temperature, and (c) humidity. If the rate of bleeding is roughly equal to the rate of evaporation, then bleeding will not cause any problem. If the rate of bleeding is less than the rate of evaporation, then the surface becomes dry, because of which cracks appear on it. The restraint at the bottom encourages such cracks. The evaporation of water from the surface of concrete depends on (a) the relative humidity of the surrounding air, (b) the ambient temperature, and (c) the velocity of wind.

Sunday, 1 May 2016

MSDS


There are colors and numbers on container chemical labels which may not be understood. In addition to the original container labels, the N.E.P.A. (National Fire Protection Association) uses a diamond-shaped, four-section, color-coded system to easily identify labels in an emergency. This system is designed to aid firefighters at the scene of a chemical fire in quickly identifying the hazards. OSHA and NIOSH have approved the scale for warning labels to read Caution, Warning and Danger.This program discusses the meaning of the four sections of the diamond-shaped warning symbol and their ratings.


 Price: 25.00



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ISO 9001: 2000 - Benefits and QMS Requirements


This course introduces the ISO 9001:2000 Standard by presenting a definition, a brief history of the standard, and how to build a quality management system that allows for a business to succeed in today’s competitive marketplace.


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Category: ISO 9001:2008


By 360training


 




http://www.gulf-jobs.info/iso-9001-2000-benefits-and-qms-requirements/ #Uncategorized

Property and Casualty Insurance License Prep Course (PA)


This online course curriculum prepares a candidate to take and pass the state administered exam in order to earn a Property and Casualty Insurance license. The content consists of two main sections: the national core containing sections I through III, and the state law section containing section IV. Each chapter in sections I through III contains assessment questions to emphasize study points; in addition, there is a state law exam and a final exam at the end of the course.


 Price: 99.00



Category: 


By 360training


 




http://www.gulf-jobs.info/property-and-casualty-insurance-license-prep-course-pa/ #Uncategorized

Friday, 29 April 2016

A new custom 3D printable cement


While 3D printing homes still sounds like something that only happens in science fiction, the technology is coming along nicely. There are naturally a few hurdles to overcome before it becomes commonplace, but most of the pieces are already in place. Companies have developed large robots capable of acting as large-scale 3D printers, and new concrete and cement formulas are being developed regularly. The major obstacles at this point seem to be the cost of the procedure, which is bound to drop as the tech becomes more common, and the versatility of the robot doing the 3D printing. However, those are relatively minor technological obstacles that don’t seem to be slowing down the advancement of the process. 

The real obstacles are, as always, materials. The concrete and cement materials need to be well suited to constructing with large-scale 3D printing robots, and they need to be able to dry quickly to support themselves and bond together firmly. Thai cement maker Siam Cement Group (SCG) has developed an amazing new cement that is mixed with a special combination of powder materials and fibers that allow it to quickly be printed into non-traditional shapes. It binds quickly enough that it can be printed with dramatic curves and twists, and it can remain freestanding while drying without the need for support material. 

SCG used their new formula to 3D print six structural beams that essentially mimic the anatomy of a bone. They are strong on the outside, while remaining partially hollow and spongy on the inside, which results in a structure far more resilient than traditional concrete. The columns were used to create a beautiful pavilion structure designed by Thai architect Pitupong Chaowakul. It’s called “Y-Box Pavilion 21st-century Cave”, which is Southeast Asia’s first 3D printed structure. The name is a pun based on a common question that architects ask about housing, ‘why does it have to be a box?’. 

The Y-Box Pavilion is an installation being displayed at the “Architect16″ exhibition” at the Muang Thong Thani Impact complex from April 26th to May 1st. It is called a cave because the columns were designed to be modern interpretations of stalagmites — however, rather than simply deposits of limestone, these are structural-supporting beams. Their unique geometry was designed to be not only beautiful, but strong and durable, with an internal structure that only adds to their ability to bear the load of a roof. Not only is it the specially created formula of cement what makes the structures possible, but eventually the process is expected to speed up construction while giving architects the freedom to think beyond boxes and traditional upright columns and flat walls. 

The design for the columns that make up the Y-Box took Chaowakul about three months to design, and using a large-scale 3D printer from Italy the columns took about another month to fabricate. The specially developed cement paste that was used is quite solid and can withstand very high compression rates. The Y-Box is ostensibly a rain shelter that was designed with no specific function in mind, however the columns can easily be used as supports for structures like homes or buildings. The technology used to create the columns can completely change the way that architects need to design structures, and can alter everything that we know about designing houses. 

Although don’t go getting rid of your hammer and nails any time soon, it is still early days of 3D printed structures. The process needs to be streamlined and simplified, and it is still extremely expensive to use on a large scale. Just the columns alone took SCG about 1 million Baht ($28,500) to manufacture, and that is without the cost of the design and installation. The Y-Box Pavilion is also just a structure made with the six columns and clearly isn’t an entire home. But given time, and some investments in refining the technology, and someday we’ll all be living outside of the box. Do you see a future for materials like this

Wednesday, 20 April 2016

Smart sensors save project QC/QA costs

Concrete is the most widely used construction material in the world as its ingredients, e.g. aggregate, water and cement, are readily available everywhere. The properties of hardened concrete are governed by various factors such as the mixture design and curing conditions. Concrete is often ordered for a project based on the required strength. This is a critical parameter as various operations such as formwork removal and application of load depend on when the concrete reaches a specific strength.

The most commonly used method to monitor the strength of concrete is through breaking specimens that are poured and cured in the field subjected to the same curing conditions as for the concrete structure. Sometimes, cast-in-place concrete specimens are prepared by embedding plastic molds in the slab to achieve a better representation of real concrete strength.

This method is not efficient as there is a delay in obtaining results (through the time spent of sending samples to laboratory, breaking, and reporting), and is not accurate as usually one specimen is tested. Even a couple of hours of delay and uncertainty in results has significant financial implications as the construction crew is waiting on the job site.

Among other non-destructive methods of strength measurement, the pull-out and Schmidt hammer tests are not reliable as they greatly influenced by local material conditions. The only non-destructive method that is widely accepted by the standards and building codes is the concrete maturity test. In this method, the strength is correlated with the concrete maturity which is a function of temperature history in field-cured concrete. ASTM C1074 and NEN 5970 describe three different standard specification for this method.

The in situ temperature monitoring which is the key part of maturity method, is often performed using wired loggers or thermocouples connected to a data logger. These wired systems are installed prior to pouring concrete. After hardening, the temperature data is collected either using a hand-held data logger or connecting the logger-box to computer. This data is then analyzed based on the concrete maturity concept to calculate the concrete strength. One of the challenges of using these systems is to take care of the wires as they often get cut in the construction job site. Moreover, the data collection and analysis is time-consuming.

Recently, wireless mobile-based sensors (such as Giatec SmartRock) have been developed for more efficient approach to concrete temperature/maturity monitoring. Utilizing these wireless mobile-based smart sensors can significantly reduce the time and accordingly the cost of concrete quality control. Here is an example calculation of the cost saving based on a real project experience.

In a typical 40-story high-rise concrete structure, 200 maturity meters are needed for real-time strength monitoring. Using each wireless temperature sensor helps saving 20 minutes of installation time, and 40 minutes of reading/analyzing time. Assuming that the data from each sensor is collected at 3 different times by a technician with hourly cost of $50, the total labor cost saving in the quality control of this project will be about $63,500. This saving easily justifies the investment of $17,000 for wireless SmartRocks ($85 each) instead of using wired temperature sensors.

In addition, there is a significant cost saving as a result of using maturity method by eliminating the need to break samples (about $30K to $50K in the above example project) and more importantly by optimizing the construction schedule as the real-time strength monitoring enables project managers to save up to a day on early formwork stripping for each floor. Even in projects where the break test is mandatory, the maturity concept can be used to determine the optimum time at which the field specimens should be sent to lab for the break test. Considering these advantages, it is no surprise that more and more contractors are implementing maturity method in their engineering practice. See some of the examples here where SmartRock sensor has helped improving the project flow of various companies worldwide.

Thursday, 14 April 2016

Cement

Definition: Cement is defined in many ways as follows, • Cement, any material that hardens and becomes strongly adhesive after application. • Manufactured substance consisting of gypsum plaster, or Portland cement. • Portland cement hardens and adheres after being mixed with water. History of Cement: • The term “Portland cement” was first used in 1824 by Joseph Aspdin, a British cement-maker, because of the resemblance between concrete made from his cement and Portland stone, which was commonly used in buildings in Britain. • At that time cements were usually made in upright kilns where the raw materials were spread between layers of coke, which was then burnt. • The first rotary kilns were introduced about 1880. Portland cement is now almost universally used for structural concrete. Manufacturing Process: • Main ingredients used in the manufacture of cement are: • Limestone – Calcium • Clay, shale – Silica/Alumina • Quarrying – local resources necessary: no market • Limestone (CaCO3) and Clay are two main raw materials used for manufacturing Portland cement clinker. • Clays have various amount of SiO2 and Al2O3. • In the manufacturing process of Portland cement, clinker consist essentially of grinding the raw materials, mixing them in appropriate proportion, burning the raw material in a kiln at a temperature of 1400-1500oC until material partially fuses into balls known as Clinker and grinding cooled clinker together with a small amount of gypsum rock. • The mixture of raw material is burned in a rotary kiln.

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