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Исследование свойств и области применения торкрет-бетонов.
Приведены результыты исследований физико-механических характеристик 48 составов торкрет-бетона. Работы по экспериментальному торкретированию проводились на полигоне лаборатории НИЦ СМ ОАО ЦНИИС. Полученные в лабораторных условиях результаты и опыт компании ЗАО «Служба защиты сооружений» легли в основу разработанного и утвержденного СТО 16216892-001-2008.
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Долговечность сухих смесей торкретбетона.
Г.В. Сигебрехт, А. Литвин, С.Х. Геблер
Были проведены испытания образцов сухих смесей торкретбетона, отобранных с готовых панелей с нанесенным материалом, на морозостойкость, хлоридно-ионную проницаемость, прочность при сжатии, параметры пористости и поглощающую способность. Результаты показали, что характеристики пористых структур, относительно высокая прочность при сжатии и низкая проницаемость обеспечивают морозостойкость в пресноводной среде, сравнимую с морозостойкостью хорошо поризованного бетона. Однако под воздействием морской воды в условиях перепада температур сухой торкретбетон с добавлением портландцемента может потребовать внесения герметика или грунтовки, либо нанесения более толстого слоя торкретбетона для защиты замоноличенной в бетон стальной арматуры.
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Сталефиброторкретбетон: обзор последних разработок
Чарльз Х. Хенагер
В этой статье рассматриваются технология и способы применения торкретбетона, армированного стальным волокном, материала, который на 2% от общего объема состоит из стальной фибры (волокна). Приблизительные размеры фибры составляют 25 мм × 0,4 мм.
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Морозостойкость торкретбетона
Дадли Р. (Расти) Морган
Вниманию читателя представляется материал 14-летней давности «Классические работы по торкретбетону».
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Использование торкретбетона, армированного фиброй.
Питер C. Татнал
Многие читатели «Shotcrete» знают о том, что в этом журнале были опубликованы многочисленные статьи по вопросу использования торкретбетона, армированного фиброй, но статей, в которых были упоминания о нем, намного больше.
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Огнеупорность торкретбетона: влияние добавления волокон на взрывное откалывание
События последнего года заставили нас, работающих в бетонной промышленности, обратить особое внимание на воздействие, которому подвергаются бетонные конструкции при взрывах и пожарах.
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Shotcrete Repairs - the main development trend in Poland.
by Wlodzimierz Majchrzak, Wlodzimierz Czajka, and Zdzislaw Jurek
The shotcrete method first appeared in Poland in the 1930s. Technical literature available at that time described shotcrete as “concrete application under pressure of compressed air and its use in the building industry.” Only the drymix shotcrete method was used at that time and the shotcrete guns were similar to Carl Akeley’s cement gun.
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Shotcrete Repairs in Barbados - A Caribbean Experience.
by Joe Hutter, Jean-François Dufour, and Nigel Fullam
Challenges associated with the placement of concrete vary depending on the conditions in which the project is undertaken. Extreme climactic conditions can often be one of the most significant contributors to these challenges. For example, extremely cold temperatures will have a
lengthening effect on the time required for concrete to reach its final set and delay its strength development at early age. In a case where the concrete freezes before reaching this point, the long-term effect on the hardened properties such as compressive strength and durability can be dramatic.
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Shotcrete Retrofit of a Mechanically Stabilized Earth Wall.
by Roland Heere, Dudley R. Morgan, and Stephen Jungaro.
The Municipality of Maple Ridge in British Columbia, Canada, commissioned a specialty
contractor to build a 9 m (29.5 ft) diameter culvert, incorporated in a mechanically
stabilized earth (MSE) wall, to provide a street crossing for a stream. The culvert had been partly sunk into the stream bed to adapt to the site conditions. The MSE walls were a maximum 8 m (26.3 ft) high above the ground and 70 m (230 ft) long. Figure 1 shows part of the North Face of the MSE wall.
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Slope Stabilization Using the Shotcrete Grid Beam System in Japan
by Yuji Samaru and Koji Sugiyama.
Continuous grid beam structures made of shotcrete have been used for over 30 years in Japan to stabilize natural and man-made cut slopes. This slope stabilization structure, generally called “Grid Beam,” is widely applied in Japan. It was used in more than 4600 slope stabilization sites in Japan in the year 2002 alone. The Grid Beam system is often used independently to protect
slope surfaces from erosion, or used as a supporting structure, combined with ground anchors or soil nails to stabilize the slope against failures. The area surrounded by the beams is often revegetated to improve aesthetics and harmonize the installation with the surrounding environment (see Fig. 1). Due to the geometric flexibility of this system, the concrete beams can easily follow the undulations of natural slopes and maintain good contact with the surface.
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Advances in Shotcrete Technology for Infrastructure Rehabilitation.
by Dudley R. “Rusty” Morgan
This paper was first presented at the Concrete Institute of Australia, 22nd Biennial Conference, Concrete 05, Melbourne, October 17-19, 2005, and is republished with their authorization.
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Soil and Rock Slope Stabilization Using Fiber-Reinforsed Shotcrete in North America.
by Mike Ballou and Matt Niermann
Soil and rock slope stabilization issues, ground control problems, and erosion vary greatly throughout North America. This is mainly because of the vastness of the continent; different climates, rainfall, and humidity; as well as, in some areas, freeze-thaw and snow conditions. Identifying a simple solution for slope stabilization that will work everywhere in North America is impossible. However, there are places where a simple solution is possible using fiberreinforced shotcrete (FRS). The purpose of this paper is to describe some applications where FRS has produced satisfactory results, with reasonable costs and often with a significant reduction in
total construction time. The use of shotcrete for slope and rock stabilization has increased substantially in the past few years. This paper explains why some design firms and contractors are switching from wire mesh and rebar to fibers.
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Thick Section Overhead Repair and Strengthening of a Concrete Pier: A Viable Shotcrete Solution.
by Roger Runacres
When considering placement options for thick section overhead concrete repair or strengthening, more often than not, the consideration of a shotcrete solution is overlooked. Historically, shotcrete has suffered from being mainly associated with vertical placements for above ground work. This may be due to the fact that until 1983, silica fume enhanced shotcrete was unheard of in North America; therefore, building up placement lifts overhead of more than a few inches thick using shotcrete was not deemed possible. Additionally, many shotcrete contractors customarily have avoided low production applications where placement volumes are measured in cubic yards per day rather than cubic yards per hour. As a result, most thick overhead concrete sections have been placed via the more common method of forming and pumping.
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The History of Shotcrete.
by George D. Yoggy
At the beginning of the 20th century, significant pieces in the foundation of America’s Industrial Revolution were established in the Lehigh Valley of Eastern Pennsylvania. Iron and steel, important products to the early development of our continent, were produced in Bethlehem, PA, and the first production of portland cement in North America took place in Coplay, PA. The Lehigh Portland Cement Company was founded in Allentown in 1897, and cement production is still an important industry in the area. Several support businesses and professions, as well as Lehigh University, resided in the valley to provide engineering, design, testing, and manufacturing services for the production of cement and steel. Also early in the century, in 1904, the American Concrete Institute (ACI) was established, and the Portland Cement Association was formed in 1916.
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The Setenave Dry Docks Rehabilitation.
by Ivan Ramalho de Almeida, Thomaz José Ripper Barbosa Cordeiro, and José Paulo Veríssimo Maia Costa
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Shotcrete Repair of WWII Concrete Hulks.
by Neil McAskill and Roland Heere
In response to a shortage of plate steel during the Second World War, the United States Maritime Commission ordered 24 ships and 58 barges to be constructed with lightweight concrete. The ships were typically about 336 ft (110 m) long with a beam of 54 ft (16.5 m) and a
displacement of about 11,000 tons (10,000 t). These ships and barges performed various levels of military service but typically for relatively short times due to several factors, not the least of which was the end to hostilities shortly after their launches. The useful service of these vessels (as ships and barges) was measured in months, with some being decommissioned immediately after delivery. However, at Powell River in British Columbia, Canada, as a floating breakwater and
impoundment for the log storage pond, most of the surviving hulks have over 50 years of service in a saltwater environment. The Powell River floating breakwater is comprised of seven WWII steamships, two WWII barges, and one WWI steamship. The paper mill in Powell River acquired these ships between 1948 and 1966. After their arrival, the ships were stripped of amenities and machinery and the hulks placed in service as a breakwater.
По материалам сайта www.shotcrete.org
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Вступление в СРО
ЗАО "Служба защиты сооружений" вступило в СРО НП "Объединение инженеров строителей" и получило допуски к работам.
Проведены испытания изделий из торкрет-бетона.
В 2008 году в лаборатории «СМ» института ЦНИИС проведены испытания изделий из торкрет-бетона 48 составов.
В конце 2008 года разработаны и введены в практику применения
В конце 2008 года разработаны и введены в практику применения согласованные с ГУП «Мосинжпроект»», ОАО ЦНИИС, ГУП «ГОРМОСТ» «Методические рекомендации по применению торкрет-бетона...
ОАО «ЦНИИПромзданий»
ОАО «ЦНИИПромзданий» совместно с ЗАО « Служба защиты сооружений» разработало и ввело...
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