.... Decommissioning of the structure presented a unique research opportunity to investigate how damage owing to alkali–silica reaction ( ASR ) developed in a concrete member with various levels of restraint. Following decommissioning of the pier cap, cores were extracted longitudinally from a number of restraint...

...Rennan Medeiros; Leandro Sanchez; Antonio Carlos dos Santos This work examined the anisotropic behaviour of internal swelling reactions (ISRs), specifically alkali–silica reaction ( ASR ) and delayed ettringite formation, in prestressed concrete sleepers retrieved from a northern Brazilian railroad...

.... aggregates alkali–aggregate reaction alkali–silica reaction cracks & cracking JSPS KAKENHI JP22K04266 JSPS KAKENHI JP23K04000 This work was supported by JSPS KAKENHI grant number JP22K04266 and JSPS KAKENHI grant number JP23K04000. The consensus among researchers...

...Rennan Medeiros; Ana Bergmann; Olusola Olajide; Cassandra Trottier; Leandro Sanchez; Benoit Fournier The anisotropic behaviour of 50-year-old reinforced concrete bridge columns affected by alkali–silica reaction (ASR) was investigated, focusing on the Y-shaped columns of the Robert-Bourassa/Charest...

...Zhen Liu; Tyson Rupnow; Jose Milla; Samuel B. Cooper III Existing test methods for the evaluation of alkali–silica reaction (ASR) in aggregates such as the concrete prism test (CPT) and the accelerated mortar bar test (AMBT) have shown to be either time consuming or unreliable owing to false...

...Xi Ji; Zhaojing Li; Hyo Eun Joo; Yuya Takahashi; Misato Fujishima; Taito Miura The impact of anisotropic cracking on concrete mechanically degraded by alkali–silica reaction (ASR) under multi-axial restraint conditions was quantitatively explored. An experimental framework was established...

...João Custódio; António Santos Silva; Dória Costa; Ângelo Miquithaio In recent decades, a significant number of large concrete infrastructures with deterioration problems related to alkali–silica reaction (ASR) and delayed ettringite formation have been identified worldwide. Currently, owing...

...Thomas Dyer An experimental programme was conducted to observe, non-destructively, the influence of aggregate particle size and low water/cement (w/c) ratios on alkali–silica reaction (ASR) in concrete using micro-computed tomography scanning. The results were analysed using a model developed...

...Dehui Wang; Qingnan Gong; Surong Luo; Zhengxian Yang The application of seawater and sea sand concrete (SWSSC) can reduce the construction period and cost of island infrastructure, but it may also bring the risk of alkali–silica reaction (ASR) owing to the presence of alkali ions in seawater...

... (SCMs). For both the high early strength and fly ash concretes, alkali active andesite in the pessimum proportion was mixed with coarse aggregates to investigate the effect of alkali–silica reaction (ASR) on rebar corrosion. It was found that the combined effects of chloride attack and ASR adversely...

...Yuichiro Kawabata; Kazuo Yamada; Takashi Kawakami; Yasutaka Sagawa Environmental conditions critically affect the expansion behaviour of concrete due to alkali–silica reaction (ASR) and, therefore, must be modelled to predict ASR-induced expansion behaviour. In addition, laboratory tests...

...Colin Giebson; Katrin Seyfarth; Horst Michael Ludwig The alkali–silica reaction (ASR) starts with the dissolution of silica in alkali-reactive aggregates. Besides the thermodynamic basics of silica dissolution, kinetic data are needed to model ASR in order to describe the temporal course...

... t = 1 − e − t / τ c 1 + e − t − τ l / τ c × ε AAR ∞ Figure 1. Larive's Equation (adapted from Larive, 1997) alkali-silica reaction finite element methods modelling Alkali–aggregate reaction (AAR...

...Thomas Dyer The progress of alkali–silica reaction (ASR) in specimens consisting of reactive glass aggregate in a cement matrix was monitored using X-ray micro-computed tomography. The technique was used to study the formation of cracks in both aggregate particles themselves and the matrix, as well...

... agreement with that obtained by the experimental procedure. alkali-silica reaction cement/cementitious materials modelling The influence of three main parameters of AMBT (solution concentration, cement alkali and immersion age) on the mortar expansion is a very important issue that needs...

... the concrete pore solution. Alkali–silica reaction (ASR) is by far the most common AAR type found worldwide, resulting from a chemical reaction between ‘unstable’ silica mineral forms within the aggregate materials and the alkali hydroxides dissolved in the concrete pore solution. It generates a secondary gel...

... of spent garnet inclusion. 30 04 2017 07 08 2017 15 08 2017 ICE Publishing: All rights reserved 2017 aggregates alkali-silica reaction sustainability In this study, the spent garnet was obtained from southern Johor (Malaysia). These heavy mineral sands fall...

...) commonly used in ECCs. To assess self-healing rate in GS-ECCs, specimens were pre-cracked up to 60% of their original flexure deformations and left to heal under moist curing. Alkali–silica reaction expansion, compressive and flexural strength, mid-span beam deflection capacity, crack development, rapid...