Search

The oxide compositions in Table 1 should be replaced with the following: [Table presented] In Fig. 1 caption, the reference [23] should be [30, C1]. Section 4, paragraph 2, in the sentence “The material was then sheared at 0.1 RPM for 30 s”, the “30 s” should be “60 s”. Section 6, paragraph 2, “BS EN 12350-5” should be “EN 459-2 [29]”. Table 3, in the top row under column M2.0, the missing unit is cm (i.e., 1.1 cm or 11 mm). Corrigendum Reference [C1] Bong, S., Xia, M., Nematollahi, B., Shi, C., “Ambient temperature cured ‘just-add-water’ geopolymer for 3D concrete printing applications”, Cement and Concrete Composites 121 (2021) 104060. The authors would like to apologise for any inconvenience caused. © 2022 Elsevier Ltd

The oxide compositions in Table 1 should be replaced with the following: [Table presented] In Fig. 1 caption, the reference [23] should be [30, C1]. Section 4, paragraph 2, in the sentence “The material was then sheared at 0.1 RPM for 30 s”, the “30 s” should be “60 s”. Section 6, paragraph 2, “BS EN 12350-5” should be “EN 459-2 [29]”. Table 3, in the top row under column M2.0, the missing unit is cm (i.e., 1.1 cm or 11 mm). Corrigendum Reference [C1] Bong, S., Xia, M., Nematollahi, B., Shi, C., “Ambient temperature cured ‘just-add-water’ geopolymer for 3D concrete printing applications”, Cement and Concrete Composites 121 (2021) 104060. The authors would like to apologise for any inconvenience caused. © 2022 Elsevier Ltd

The oxide compositions in Table 1 should be replaced with the following: [Table presented] In Fig. 1 caption, the reference [23] should be [30, C1]. Section 4, paragraph 2, in the sentence “The material was then sheared at 0.1 RPM for 30 s”, the “30 s” should be “60 s”. Section 6, paragraph 2, “BS EN 12350-5” should be “EN 459-2 [29]”. Table 3, in the top row under column M2.0, the missing unit is cm (i.e., 1.1 cm or 11 mm). Corrigendum Reference [C1] Bong, S., Xia, M., Nematollahi, B., Shi, C., “Ambient temperature cured ‘just-add-water’ geopolymer for 3D concrete printing applications”, Cement and Concrete Composites 121 (2021) 104060. The authors would like to apologise for any inconvenience caused. © 2022 Elsevier Ltd

The oxide compositions in Table 1 should be replaced with the following: [Table presented] In Fig. 1 caption, the reference [23] should be [30, C1]. Section 4, paragraph 2, in the sentence “The material was then sheared at 0.1 RPM for 30 s”, the “30 s” should be “60 s”. Section 6, paragraph 2, “BS EN 12350-5” should be “EN 459-2 [29]”. Table 3, in the top row under column M2.0, the missing unit is cm (i.e., 1.1 cm or 11 mm). Corrigendum Reference [C1] Bong, S., Xia, M., Nematollahi, B., Shi, C., “Ambient temperature cured ‘just-add-water’ geopolymer for 3D concrete printing applications”, Cement and Concrete Composites 121 (2021) 104060. The authors would like to apologise for any inconvenience caused. © 2022 Elsevier Ltd

3D Concrete Printing Technology provides valuable insights into the new manufacturing techniques and technologies needed to produce concrete materials. In this book, the editors explain the concrete printing process for mix design and the fresh properties for the high-performance printing of concrete, along with commentary regarding their extrudability, workability and buildability. This is followed by a discussion of three large-scale 3D printings of ultra-high performance concretes, including their processing setup, computational design, printing process and materials characterization. Properties of 3D-printed fiber-reinforced Portland cement paste and its flexural and compressive strength, density and porosity and the 3D-printing of hierarchical materials is also covered.Explores the factors influencing the mechanical properties of 3D printed products out of magnesium potassium phosphate cement materialIncludes methods for developing Concrete Polymer Building Components for 3D PrintingProvides methods for formulating geopolymers for 3D printing for construction applications

3D Concrete Printing Technology provides valuable insights into the new manufacturing techniques and technologies needed to produce concrete materials. In this book, the editors explain the concrete printing process for mix design and the fresh properties for the high-performance printing of concrete, along with commentary regarding their extrudability, workability and buildability. This is followed by a discussion of three large-scale 3D printings of ultra-high performance concretes, including their processing setup, computational design, printing process and materials characterization. Properties of 3D-printed fiber-reinforced Portland cement paste and its flexural and compressive strength, density and porosity and the 3D-printing of hierarchical materials is also covered.Explores the factors influencing the mechanical properties of 3D printed products out of magnesium potassium phosphate cement materialIncludes methods for developing Concrete Polymer Building Components for 3D PrintingProvides methods for formulating geopolymers for 3D printing for construction applications

3D Concrete Printing Technology provides valuable insights into the new manufacturing techniques and technologies needed to produce concrete materials. In this book, the editors explain the concrete printing process for mix design and the fresh properties for the high-performance printing of concrete, along with commentary regarding their extrudability, workability and buildability. This is followed by a discussion of three large-scale 3D printings of ultra-high performance concretes, including their processing setup, computational design, printing process and materials characterization. Properties of 3D-printed fiber-reinforced Portland cement paste and its flexural and compressive strength, density and porosity and the 3D-printing of hierarchical materials is also covered.Explores the factors influencing the mechanical properties of 3D printed products out of magnesium potassium phosphate cement materialIncludes methods for developing Concrete Polymer Building Components for 3D PrintingProvides methods for formulating geopolymers for 3D printing for construction applications

This article offers a comprehensive, systematic overview of the existing solutions for integrating reinforcement in digital concrete technologies with particular emphasis on Additive Manufacturing (AM) with concrete, also called 3D concrete printing (3DCP). While the functionalities of various types of reinforcement are briefly addressed, the major focus is on the integration process as such, i.e., on its technological aspects. On this basis a generic classification and process description outline has been developed for reinforcement integration, which is regarded as an extension of the RILEM process classification framework for Digital Fabrication with Concrete (DFC). In many instances, the integration occurs in a separate process step prior to or after concrete shaping. This holds true for all formative digital concrete shaping processes and for many 3DCP solutions. 3DCP approaches enable, however, integration of the reinforcement during concrete shaping as part of a single-step AM process in a simultaneous or contiguous manner, while placement of reinforcement is considered to be a sub-process.

Recently, additive manufacturing techniques such as 3D printing are becoming increasingly popular and widely used in a variety of applications. Inkjet 3D printing (i.e. powder-based printing) is one of the most reliable frequently-implemented techniques in 3D printers. This paper discusses a novel methodology to replace the currently used typical powders in 3D printing to make it possible to use the printed specimens in construction applications. The printed cubic (20Í20Í20mm) and prism (60Í5Í5mm) specimens with different saturation levels are printed to investigate the relative strength of the 3D printed specimens. Curing in different saturation environments can increase their strength and durability. In general, the experimental results show that the highest compressive strength was recorded (14.68MPa) for the samples that are first cured in water then dried in an oven for one hour at 40ºC, comparing to the samples that are cured without drying at 40ºC (4.81MPa). Accordingly, it has been discovered that the post-processing technique has an effective and significant impact on the strength of the printed specimens. Furthermore, samples which are casted using manual mixing have been also been compared in detail.

The Vietnamese construction market has witnessed slow green building development to date. The motivations for enhancing green building practices that lead to increased green building development (IND1-IND9) are generic and not yet verified in the Vietnamese context. Therefore, the extent to which these motivations apply to the Vietnamese construction industry is currently unknown how. This study responds by surveying the opinions of 166 construction professionals covering the education, public and industry sectors in Vietnam. The findings reveal that all IND1-IND9 are very influential, with mean scores >3.77 out of a maximum possible 5.00. Of these, monetary benefits are the most influential, followed by societal gratification and improved human well-being, while the least influential is government regulation. Furthermore, financial incentives and economic benefits are the most influential motivators of construction professionals in each of the education, public and industry sectors. It is concluded that motivation is very important for encouraging green building development among construction professionals in Vietnam and that the government needs to focus more on providing financial and/or economic incentives as a means of increasing green building development in the country.

Recently, additive manufacturing techniques such as 3D printing are becoming increasingly popular and widely used in a variety of applications. Inkjet 3D printing (i.e. powder-based printing) is one of the most reliable frequently-implemented techniques in 3D printers. This paper discusses a novel methodology to replace the currently used typical powders in 3D printing to make it possible to use the printed specimens in construction applications. The printed cubic (20Í20Í20mm) and prism (60Í5Í5mm) specimens with different saturation levels are printed to investigate the relative strength of the 3D printed specimens. Curing in different saturation environments can increase their strength and durability. In general, the experimental results show that the highest compressive strength was recorded (14.68MPa) for the samples that are first cured in water then dried in an oven for one hour at 40ºC, comparing to the samples that are cured without drying at 40ºC (4.81MPa). Accordingly, it has been discovered that the post-processing technique has an effective and significant impact on the strength of the printed specimens. Furthermore, samples which are casted using manual mixing have been also been compared in detail.

This study presents an investigation of the effect of hydrocarbon fire exposure on the residual compres- sive strength properties of geopolymer concrete panels and cylinders. Gladstone flyash was utilized as the binder whilst the alkaline solution/fly-ash ratio and sodium silicate to sodium hydroxide (Na2SiO3/ NaOH) ratio was 0.4 and 2.5 respectively. The compressive strength at the test date was 64 MPa. Two dif- ferent cylindrical specimens’ sizes (150 and 100 mm diameter 300 and 200 mm high) were exposed on all sides to the hydrocarbon fire scenario for 120 min whilst panels of 1075 1075 200 mm were exposed on one side for the same time duration. Results showed that no significant spalling occurred in any of the specimens and the mass loss during heating was between 2.70 and 4.65% respectively which was attributed due to moisture loss. Low differential gradients and thermal incompatibility between the geopolymer paste and aggregates provides geopolymer concrete with superior spalling resistance than Ordinary Portland cement concrete. Residual compressive strength testing showed that the panels main- tained approximately 60% of their initial compressive strength indicating that geopolymer concrete spec- imens can maintain sufficient load bearing capacity in the event of fire exposure. The residual strength profiles indicated that specimen size effect was also exhibited with the remaining strength of the cylin- ders being approximately 10 and 20% for the 100 mm and 150 mm dimeter specimens respectively. The dull red color exhibited in all specimens after fire testing indicated the presence of high iron content in the geopolymer matrix. Insitu temperature analysis showed that the geopolymer concrete had excellent heat resistance capabilities with temperatures at a depth of 100 mm from the exposed surface ranging between 39 C and 45 C after 30 min of fire exposure even though the temperature at exposed surface exceeds 1000 C. This is reinforced by the fact that the ge

This study presents an investigation of the effect of hydrocarbon fire exposure on the residual compres-sive strength properties of geopolymer concrete panels and cylinders. Gladstone flyash was utilized as the binder whilst the alkaline solution/fly-ash ratio and sodium silicate to sodium hydroxide (Na2SiO3/NaOH) ratio was 0.4 and 2.5 respectively. The compressive strength at the test date was 64 MPa. Two dif-ferent cylindrical specimens’ sizes (150 and 100 mm diameter

As a 2D nanomaterial, graphene oxide (GO) has attracted considerable attentions for reinforcing cementitious materials. However, special attention must be paid to the dispersion of GO in the matrix, as the quality of nanomaterial dispersion correlates directly with its effectiveness for improving mechanical and other properties. In this study, the dispersion of graphene oxide (GO) in simulated pore solution and cement paste was investigated. It was found that severe GO aggregation occurred in presence of divalent calcium ions in both pore solution and cement paste. However, the GO aggregates were not stable under shear mixing. After vigorous mixing, the massive GO aggregates split into medium-sized particles, ranging from few to several 100 μm. To improve the GO dispersion in cement paste, silica fume was used to mechanically separate individual GO nanosheets. The dispersion was then investigated using microstructure analysis and mechanical properties. The results showed that, with the addition of silica fume, the dispersion of GO nanosheets was greatly improved. © 2016 Elsevier Ltd

Handbook of Low Carbon Concrete brings together the latest breakthroughs in the design, production, and application of low carbon concrete. In this handbook, the editors and contributors have paid extra attention to the emissions generated by coarse aggregates, emissions due to fine aggregates, and emissions due to cement, fly ash, GGBFS, and admixtures. In addition, the book provides expert coverage on emissions due to concrete batching, transport and placement, and emissions generated by typical commercially produced concretes.Includes the tools and methods for reducing the emissions of greenhouse gasesExplores technologies, such as carbon capture, storage, and substitute cementsProvides essential data that helps determine the unique factors involved in designing large, new green cement plants

Handbook of Low Carbon Concrete brings together the latest breakthroughs in the design, production, and application of low carbon concrete. In this handbook, the editors and contributors have paid extra attention to the emissions generated by coarse aggregates, emissions due to fine aggregates, and emissions due to cement, fly ash, GGBFS, and admixtures. In addition, the book provides expert coverage on emissions due to concrete batching, transport and placement, and emissions generated by typical commercially produced concretes.Includes the tools and methods for reducing the emissions of greenhouse gasesExplores technologies, such as carbon capture, storage, and substitute cementsProvides essential data that helps determine the unique factors involved in designing large, new green cement plants

In this study, granular phase change material (PCM) composites were developed by absorbing paraffin into the pores of expanded perlite particles with two grades of particle size. Because of the different particle sizes and pore structures, the absorption mechanisms of the expanded perlite particles were found to differ. A significant amount of paraffin leakage was found when the PCM composites were applied directly into the cement mixture. To prevent such leakage, a new method by using hydrophobic silane was investigated as surface modification for the PCM composites. The method was then compared with nanosilica deposition method. Although both methods prevented leakage effectively, cement composites incorporating silane-modified PCM composites had lower compressive strength than those incorporating nanosilica modified PCM composites. Thermal performances of expanded perlite/paraffin composites were compared with that of microencapsulated PCM and the results showed expanded perlite/paraffin composites were superior under certain conditions. © 2016 Elsevier Ltd

In this study, granular phase change material (PCM) composites were developed by absorbing paraffin into the pores of expanded perlite particles with two grades of particle size. Because of the different particle sizes and pore structures, the absorption mechanisms of the expanded perlite particles were found to differ. A significant amount of paraffin leakage was found when the PCM composites were applied directly into the cement mixture. To prevent such leakage, a new method by using hydrophobic silane was investigated as surface modification for the PCM composites. The method was then compared with nanosilica deposition method. Although both methods prevented leakage effectively, cement composites incorporating silane-modified PCM composites had lower compressive strength than those incorporating nanosilica modified PCM composites. Thermal performances of expanded perlite/paraffin composites were compared with that of microencapsulated PCM and the results showed expanded perlite/paraffin composites were superior under certain conditions. © 2016 Elsevier Ltd

Handbook of Low Carbon Concrete brings together the latest breakthroughs in the design, production, and application of low carbon concrete. In this handbook, the editors and contributors have paid extra attention to the emissions generated by coarse aggregates, emissions due to fine aggregates, and emissions due to cement, fly ash, GGBFS, and admixtures. In addition, the book provides expert coverage on emissions due to concrete batching, transport and placement, and emissions generated by typical commercially produced concretes.Includes the tools and methods for reducing the emissions of greenhouse gasesExplores technologies, such as carbon capture, storage, and substitute cementsProvides essential data that helps determine the unique factors involved in designing large, new green cement plants

In this study, granular phase change material (PCM) composites were developed by absorbing paraffin into the pores of expanded perlite particles with two grades of particle size. Because of the different particle sizes and pore structures, the absorption mechanisms of the expanded perlite particles were found to differ. A significant amount of paraffin leakage was found when the PCM composites were applied directly into the cement mixture. To prevent such leakage, a new method by using hydrophobic silane was investigated as surface modification for the PCM composites. The method was then compared with nanosilica deposition method. Although both methods prevented leakage effectively, cement composites incorporating silane-modified PCM composites had lower compressive strength than those incorporating nanosilica modified PCM composites. Thermal performances of expanded perlite/paraffin composites were compared with that of microencapsulated PCM and the results showed expanded perlite/paraffin composites were superior under certain conditions.