Results 21 to 30 of about 549 (169)
Pipe pressure of mining wet shot crete flowing in pipes [PDF]
E3S Web of Conferences, 2021 In order to explore the pressure change law of mining wet shotcrete in pipes, the rheological model was built based on rheology principle, and the computational formula of rheological parameters of wet shotcrete was deduced with the linear regression ...
Chen Lianjun +3 more
doaj +1 more source
Rheological analysis of wet-mix shotcrete with various viscosity-modifiying admixtures
Tunnelling and Underground Space Technology, 2022 Shotcrete must be suitable for the process of transport (pumping) and application (spraying) on site. Therefore, it is necessary to obtain a suitable consistency and rheology for its placement. This paper evaluates the influence of various viscosity modifying admixtures (VMAs) on the rheology and thixotropy for application in wet-mix shotcrete.
Castellanos Castellón, Ramiro +4 more
openaire +2 more sources
Mix design of high performance wet shotcrete [PDF]
, 2023 In order to reduce the springback rate of wet shotcrete and prepare high-performance wet shotcrete that meets on-site construction requirements and save costs, the Weiwu Expressway Suiguangshen Intercity Railway- Qianhai Turnback Line Tunnel is used as ...
Guona, M.
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, 2022 A comprehensive experimental program on the mechanical, hygral and thermal behavior of a modern wet mix shotcrete is presented. The present part I deals with the evolution of the uniaxial compressive strength, splitting tensile strength, Young’s modulus,
Smaniotto, Stefan +4 more
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Role of chemical admixtures in improving wet-mix shotcrete performance for ground support [PDF]
Proceedings of the International Conference on Deep and High Stress Mining, 2017 This paper presents the results of laboratory and field experiments conducted for a major ground support operation to assess the performance of wet-mix shotcrete incorporating various chemical admixtures. The project had an alkali-silica reaction (ASR) risk due to the aggregates available in the region being reactive. Therefore, a customised mix design
Ezgi Yurdakul +2 more
openaire +1 more source
Case Studies in Construction Materials, 2019 The air content and void structure of hardened shotcrete is essential for its durability and resistance against freeze thaw damage. However, producing a mix which is pumpable, shootable, and also meets durability requirements is not always easy.
S. Talukdar, R. Heere
doaj +1 more source
Research on Rebound Rate of Nano-Scale Admixture Wet-Mix Shotcrete
IOP Conference Series: Materials Science and Engineering, 2019 Abstract High rebound rate and low construction efficiency are outstanding problems for traditional shotcrete. To solve these problems, Nano-scale admixture (NSA) was used to prepare high performance wet-mix shotcrete. Tests of sidewall rebound rate and overall rebound rate were carried out to study the effect of NSA.
Feng Wei Ning +4 more
openaire +1 more source
Structural Concrete, EarlyView.Abstract The use of fiber reinforced concrete (FRC) in precast tunnel segments is among the most established and representative applications of this material. Over the past two decades, numerous tunnel linings were constructed with partial or total substitution of conventional steel reinforcement by fibers, this yielding to quantifiable benefits in ...
Vladimir Rusanov +4 more
wiley +1 more source
Deep Underground Science and Engineering, Volume 5, Issue 2, Page 506-538, June 2026.The Great Dyke of Zimbabwe is notable for its rich platinum group metal deposits but poses significant geological and geotechnical challenges due to its complex rock types and structural features. Traditional pillar design methods are insufficient for addressing these complexities; the study suggests incorporating advanced techniques such as machine ...
Tawanda Zvarivadza +3 more
wiley +1 more source
Propriedades mecânicas nas primeiras idades como preditoras das tensões induzidas e fissuração de concreto projetado reforçado com fibras [PDF]
, 2014 Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Civil, Florianópolis, 2014.Como o concreto projetado é normalmente carregado durante as primeiras horas da hidratação, sem nenhum ...
Pillar, Nora Maria de Patta
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