despite the many benefits of post-tension concrete applications, repair and maintenance are vital. learn more about post-tension repair services now.
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should you use post-tension cables or rebar to reinforce your concrete slab? we compare them and show how a concrete scanner can ensure proper installation.
post-tension slabs are an innovative solution in modern construction, offering strength, flexibility, and efficiency. however, like any advanced engineering system, they come with their own set of challenges. understanding these issues and learning how to address them is critical to ensuring the durability and performance of post-tension slabs. this blog…
there are several key differences between a regular slab-on-grade foundation and a post-tension foundation. consulting with the qualified structural engineers at lynn engineering will help you determine the most suitable foundation system for a specific project.
this article expounds on the problem of the use of de-icing salts in the corrosion of steel rebars in bridge decks and their effect on post-tensioning elements. in particular, this paper focuses this problem on structures affected by an aggregate–alkali reaction and without any waterproof treatment using the example of one structure whose repair was carried out in 2020. in this structure, the internal stresses due to the aggregate–alkali reaction caused longitudinal cracks in the upper face of the deck, through which the penetration of chloride ions was concentrated, causing, finally, the brittle fracture of the steel bars and the corrosion of the prestressing elements. this article also explains some conclusions about the most probable mechanisms that resulted in the brittle fracture of the steel bars due to the extraordinary and unexpected nature of this phenomenon.
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find out what post-tension slab foundations are, their construction, advantages, disadvantages, common repairs, and maintenance tips.
learn more about understanding prestressed and post-tensioned concrete in building construction - structural engineering - evstudio .
the bond between prestressing strands and concrete within the dead-end zone of a post-tensioned concrete member significantly influences the effectiveness of the strand-concrete system. however, the existing code equations for determining development length rely on studies conducted on pretensioned concrete members rather than post-tensioned ones. as a result, the implementation of development length for prestressing strands with bulb-shaped dead end anchorage in post-tensioning slabs relies on common practice and former experience. unfortunately, this can sometimes lead to concrete cracks or strand slippage at the dead end zone due to insufficient development length. this paper presents an experimental study on post-tensioning slab segments representing the dead end zone. the aim of this study is to assess the development length of prestressing strands with bulb-shaped dead end that shall guarantee full bond with concrete throughout the member’s service life. the specimens were divided according to three different concrete compressive strengths 34 mpa, 48 mpa and 70 mpa. the parameters considered included slab thicknesses of 160 mm and 250 mm, as well as strand embedment lengths of 700 mm and 850 mm. based on the test results, the sufficient development length was determined. furthermore, a verification was carried out to assess the validity of applying predicted equations from an adopted bond model to determine the bond strength of strand with bulb-shaped dead end anchorage in concrete slabs.
discover how pte systems international supports various construction applications with advanced post-tensioning services.
need post tensioned concrete specialists near you? trd group delivers quality steel fixing, formwork solutions & post tension slabs. call us for a quote.
explore the comprehensive guide to post-tension cables in calgary's construction. understand their role in modern architecture, their advantages over rebar, and the critical importance of regular inspections for maintaining structural integrity. lear
i don't have a lot of experience with post tension slabs, yet came across a potential client with a series of post tension slabs yesterday with problems...
builders in modern construction rely on post-tensioning systems for one clear reason – they are a game-changer when it comes to reinforcing concrete in large-scale projects. and when it comes to laying the foundation for both residential and commercial structures,...
post-tensioned concrete is a popular structural system for high-rise developments and parking facilities. learn about the pros and cons of this approach.
post tension concrete reinforces & strengthens it with tensioning steel rods. learn more about the whats, whens, hows, & whys of this method.
answer: in post-tensioned slab construction, construction joints are locations where concrete placement is intentionally stopped and then resumed. these joints are strategically placed to accommodate the post-tensioning tendons and facilitate construction. here are considerations to keep in mind ...
when post-tensioning in cold weather monitoring the temperture and strength of your in-situ concrete elements is very important.
have you heard about post tension slabs? what is a post tension slab? this article talks about post tension slab problems and advantages.
post-tensioned flat slab (pt) system has become widely used in the construction field in the recent time. the main advantages of the post-tensioned slab system are strength improvement and resource savings. additionally, the conventional post-tension flat slab is an economical system, especially for long-span structures. however, it may not be suitable for structures with significant variations in spans in both directions of the slab. the unidirectional post-tensioned slab, which involves a post-tensioning system in one direction of the slab and a normal reinforced concrete flat slab system in the perpendicular direction. this offers an effective solution for the specific issues mentioned above. this system is also recommended for structures with expansion joints that do not have enough space to install the post-tension system and tensioning machine. in the current research, the punching shear behavior of conventional bidirectional pt slab was compared to unidirectional pt slab counterparts. five post-tensioned specimens were tested to investigate the punching shear behavior for unidirectional pt slabs at different parameters. variation of precompression stress level using different numbers of tendons and distribution of tendons were the variable parameters studied in unidirectional pt slabs. all slabs were exposed to static loading until failure using a 2200 kn hydraulic jack with a pump capacity. deflection behavior of all slabs was measured using a linear variable differential transformer device (lvdt). additionally, strain gauges were fixed on concrete, steel bars, and tendons to evaluate the strain of each item. the results obtained that the five tendons unidirectional pt specimens had a 1.4% reduction of punching shear resistance compared to bidirectional pt specimen counterparts. increasing precompression stress improved punching shear capacity. specimens with banding tendons at the punching shear zone enhanced punching shear capacity by 4.5% more than those with distributed tendons. the study also indicated that the ultimate punching shear failure load was the highest in conventional post-tensioned specimen. additionally, the unidirectional post-tensioned slabs with five tendons and a precompression stress of around 1.5 mpa exhibited a 1.2% slightly higher ultimate failure load than the unidirectional counterpart with seven tendons and a precompression stress of around 2.5 mpa, however the seven tendons specimen had the best deflection behavior compared to all specimens. the three tendons specimen with a precompression stress around 1 mpa, the lowest precompression stress, exhibited the lowest ultimate failure load. the calculated punching shear capacities of all specimens from conventional post-tensioned flat slabs equations of various codes, such as the american building code (aci-214), euro code (ec) and egyptian practice code ecp-203, are compared to the existing experimental results. for the studied specimens, the cost of unidirectional pt slabs was more economical by around 29% compared to a conventional pt slab.
pre-pour meetings are essential in the construction process, particularly when dealing with complex structures such as post-tensioned slabs.
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a post tension concrete slab can counter the issues that come with building a home on unstable ground and accommodate a wider range of design features.
post-tension concrete courts-certified by post tensioning institute to provide turn-key construction for any size tennis court
the foundation of your jackson home is its backbone, literally holding everything up. in jackson, with its diverse soil conditions and ever-changing weather
for over 60 years, freyssinet has been involved in the construction of buildings and skyscrapers, providing sustainable technologies to optimise their structure, improve their behaviour during their lifetime and meet its clients' environmental concerns.
concrete slabs can be held accountable for most of the embodied carbon in our buildings, responsible for nearly 40% to 70% of the total concrete volume in a high-rise tower.
has anyone here done a garage adu and had post tension concrete to cut through? what is the process?
project gallery: the scope on this project was to locate reinforcement (post-tensioned cables), electrical conduit, and other hazards with ground penetrating radar (gpr), and an electromagnetic (em) pipe locator.
while we’ve encountered many more, here’s a selection of the 10 most common mistakes we’ve encountered in pt construction.
an anonymous report in the confidential reporting on structural safety (cross) april newsletter says that the concrete “should not have failed”, since its
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does your home sit on a post-tension slab? this article explains why a post-tension slab leak is a challenging repair job.
anchoring ceiling grids to concrete is sometimes easier said than done. concrete slabs are often strengthened using a process called post tensioning. this method makes use of embedded high strength steel cables to reinforce the concrete slab. although this construction technique produces concrete sections with excel
when it comes to constructing durable and efficient structures, choosing the right type of concrete slab is crucial. two commonly used methods in the industry