Adaptation of the standard EN 196-1 for mortar with accelerator

Galobardes, Isaac; Salvador, Renan P.; Cavalaro, Sérgio Henrique Pialarissi; Figueiredo, Antônio Domingues de; Goodier, Chris I.

doi:10.1016/j.conbuildmat.2016.09.147

Cited by 22 publications

(4 citation statements)

References 12 publications

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“…Sprayed concrete is a kind of construction material which can form integral structure with proper thickness, with both sufficient rigidity and strength in a short time. Therefore, it has been widely used in engineering cases which require fast setting and rapid hardening, such as shotcrete preparation for underground mining, tunnel construction, as well as emergency repairing works and so on (Galobardes 2013;Galobardes et al 2016;Aggoun et al 2008;Maltese et al 2007aMaltese et al , 2007b The advantages of sprayed concrete can be mainly attributed to the corporation of set accelerators, which can decrease setting time and increase early strength. Accelerators can be divided into alkaline accelerators and alkali-free accelerators.…”

Section: Introductionmentioning

confidence: 99%

Influence of Aluminum Sulfate on Hydration and Properties of Cement Pastes

Chen

Sun

2018

ACT

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This study evaluates the influence of aluminum sulfate (AS) on hydration and properties of cement pastes. The hydration behavior of cement paste contributed by AS was identified via isothermal calorimetry, X-ray diffraction (XRD), scanning electron microscope (SEM) and helium pycnometry. Setting time, compressive strength and pore structure of accelerated cement paste were also evaluated. Results indicate that the addition of AS can reduce setting time significantly and increase compressive strength of cement paste. Moreover, hydration process of accelerated cement paste can be divided into four stages according to absolute volume change measured by helium pycnometry, which are dissolution-crystallization stage, induction stage, rapid shrinkage stage and structure compacting stage. More nano-scale pores (pore diameter smaller than 10 nm) are generated in structure compacting stage, resulting in the "fake" absolute volume expansion. The rebound rate of shotcrete can be reduced with the increase of AS.

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Section: Introductionmentioning

confidence: 99%

Influence of Aluminum Sulfate on Hydration and Properties of Cement Pastes

Chen

Sun

2018

ACT

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“…The flexure strength (FS) was also measured, using the maximum force at the breakpoint applied to an area estimated from the squared section of the prism and the distance between the holders [52]. Following the procedures reported earlier [54], prismatic specimens (40 × 40 × 160 mm) were cast, compacted, and cured in a control chamber at a temperature of 20 ± 2 • C and humidity of 98 ± 1% until the age of testing (2, 7, and 28 days). Vicat's apparatus, confirming to IS: 5513-1976 [55], was used to perform the tests on the setting times (initial and final) [56] (see Supplementary Table S4) and water consistency of the mixtures [57] (see Supplementary Table S5).…”

Section: Testing Proceduresmentioning

confidence: 99%

Recycling of Egyptian Shammi Corn Stalks for Maintaining Sustainable Cement Industry: Scoring on Sustainable Development Goals

Qasem,

Sharaan,

Fujii

et al. 2024

Recycling

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This study focuses on recycling Shammi corn stalks in the cement industries, further avoiding air and soil pollution caused by their improper disposal. This crop residue was thermally treated at 700 °C for 2 h under an oxygen-rich environment to produce Shammi corn stalk ash (SCSA). This SCSA was used as a cement replacement material (2–10%, w/w), whereas the control sample included only cement. The compressive strength values for the 4% (w/w) replacement ratio at 2-, 7-, and 28-day ages were greater than those for the control by 26.5%, 15.8%, and 11.4%, respectively. This 4% (w/w) also maintained a better flexural strength than other mixtures, with proper initial and final setting times (135 and 190 min), workability (18.5 cm), and water consistency (27.5%). These mechanical/physical properties were integrated with socio-enviro-economic data collected from experts through a pairwise comparison questionnaire, forming the inputs of a multi-criteria decision-making (MCDM) model. Recycling SCSA in the cement-manufacturing process attained positive scores in the achievement of the three pillars of sustainable development, revealing an overall score greater than the control. Hence, the study outcomes could be essential in developing green concrete, cement blocks, and mortar, based on the sustainable development goals (SDGs) agenda.

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“…However, the material also needs a short setting time for early strength after extruding from the nozzle [114,115]. Setting time property mostly depends on the retarder and accelerator admixtures, and studies show that by altering the amount of retarder or accelerator, every material can achieve the required initial and final setting time [116,117]. The recommendation observed during the research shows the addition of accelerator should be in dry mixing instead of dilute with water mixing, and mixing speed and time should be 52 rpm in 20 seconds, respectively [118].…”

Section: Setting Time Controlmentioning

confidence: 99%

Bibliographic analysis on 3D printing in the building and construction industry: Printing systems, material properties, challenges, and future trends

Shahzad

UMAİR

Waqar

2022

Journal of Sustainable Construction Materials and Technologies

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In recent years, significant advancements in the development of large-scale 3D printers and construction materials have been made to meet the demand for industrial scale 3D printing construction. It is significant to construct the buildings and structural components by using 3D concrete printing. Additive manufacturing (AM) main benefits are freedom of design, construction waste reduction, mass customization, and ability to manufacture the complex structures. The major issues including the optimization of printing material which possess the suitable properties for 3D concrete printing. However, this technology towards the green building construction seems to improve the conventional methods by reducing the requirement of human resource, high investment cost, and formworks. The research community's interest in 3D printing for architecture and construction has grown significantly over the last few years. This paper review the latest trend of research and state of the art technologies in 3D printing in building and construction by analyzing the publications from 2002 to 2022. Based on aforementioned analysis of publications, printing methods, concrete printing systems and influence of constituent’s materials and chemical admixtures on concrete material properties are briefly discussed. Finally, this paper discussed the challenges and limitations of current systems, as well as potential future work to improve their capability and print quality.

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Adaptation of the standard EN 196-1 for mortar with accelerator

Cited by 22 publications

References 12 publications

Influence of Aluminum Sulfate on Hydration and Properties of Cement Pastes

Influence of Aluminum Sulfate on Hydration and Properties of Cement Pastes

Recycling of Egyptian Shammi Corn Stalks for Maintaining Sustainable Cement Industry: Scoring on Sustainable Development Goals

Bibliographic analysis on 3D printing in the building and construction industry: Printing systems, material properties, challenges, and future trends

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