Cement based composites
About: Cement based composites is an academic journal published by ACA Publishing. The journal publishes majorly in the area(s): Materials science & Compressive strength. It has an ISSN identifier of 2717-9303. Over the lifetime, 13 publications have been published receiving 3 citations. The journal is also known as: Cebacom.
TL;DR: In this paper , the effect of n-TiO2 additions at different amounts by mass (0.0%, 0.3, 0.6), 0.9%, 1.2% and 1.5%) on rheological properties (plastic viscosity and yield stress) of cement-based grouts incorporated with fly ash as mineral additive at different constitutes (0%-for control purpose, 5, 10, 15, 20, 25% and 30%) were investigated by analysis of experiments in this study.
Abstract: The effects of n-TiO2 additions at different amounts by mass (0.0%, 0.3%, 0.6%, 0.9%, 1.2% and 1.5%) on rheological properties (plastic viscosity and yield stress) of cement-based grouts incorporated with fly ash as mineral additive at different constitutes (0%-for control purpose, 5%, 10%, 15%, 20%, 25% and 30%) were investigated by analysis of experiments in this study. To prepare all samples, w/b ratio was defined as 1.0. To prevent sedimentation of TiO2 nanoparticles in free water and to supply uniform distribution of TiO2 nanoparticles in water with help of removing of these nanoparticles from each other, Ultrasonication method was applied by using a Horn type Ultrasonic Homogenizer in this experimental study. All experimental viscosity values of the cement-based grout samples were also obtained by using Coaxial Rotating Cylinder Rheometer test machine. Modified Bingham analytical model was used to investigate on this study for reference grout samples because of it shows dilatant (shear-thickening) flow behavior. Test results show that plastic viscosity values of the grout samples obtained by addition of FA remarkably decrease with rising amount of n-TiO2. Yield stress of fresh grout mixtures increases with respect to increase amount of FA content in all grout mixtures with different proportions of n-TiO2. the usage of FA as a mineral additive in cement-based grouts has improved the yield stress value of the samples. Since n-TiO2 has such a low specific surface area, the water requirement of the grout matrix tends to increase. Therefore, this situation causes increasing of cohesion. The developed ANNs model has been able to predict the plastic viscosity and yield stress of cement-based grouts containing TiO2 nanoparticle doped fly ash with very low error rates and high accuracy
TL;DR: In this paper , the authors take a look at the mechanical properties of CDW while conducting the research, credible academic sources were located on Google Scholar, SCOPUS, the Web of Science, IEEE Xplore, and Science Direct.
Abstract: The global economy depends on the building industry. Rapid building growth creates global worries about waste. Construction and demolition waste (CDW) negatively affect costs, energy, productivity, the environment, and society. Planning and storing building trash may reduce these harmful consequences. On local construction sites, waste, poor site management, and resource loss are common. The way a structure is built, how materials and equipment are transported, how employees behave, how a firm is handled, how the site is set up, and how resources are procured all contribute to construction waste, which in turn contributes significantly to the degradation of the environment due to indiscriminate disposals. This study takes a look at the mechanical properties of CDW while conducting the research, credible academic sources were located on Google Scholar, SCOPUS, the Web of Science, IEEE Xplore, and Science Direct. The publications were narrowed down to only those that were most relevant to the study's aims. After reviewing these, the authors focused on just the 49 journal articles, 15 related books, and 7 government publications that were most relevant to the research.
TL;DR: In this article , steel fibers were employed to replace 1, 1.5, 2, and 2.5 percent of the total volume of concrete, and a total of five mixed designs were conceived and constructed.
Abstract: The engineering properties of high-strength concrete are significantly different from those of ordinary concrete, and as a result, this concrete has become popular in a variety of applications, including the construction industry, particularly for tall buildings, bridges with long spans, and precast members. Reinforcing high-strength concrete using fibers is a common method for increasing ductility without losing strength. In this study, steel fibers were employed to replace 1, 1.5, 2, and 2.5 percent of the total volume of concrete, and a total of 5 mixed designs were conceived and constructed. The findings showed that the addition of steel fibers up to 2% by volume boosted the compressive strength and decreased at 2.5% by volume. The incorporation of steel fibers has diminished the mixes' durability.
TL;DR: In this article , the hysteretic performance of hybrid steel-GFRP reinforced concrete shear walls was investigated under seismic loading, and the results indicated that the GFRP-reinforced concrete slender walls had a stable hystertic response and slight residual drift up to failure.
Abstract: The vulnerability of steel reinforcement to corrosion is a severe problem affecting the overall performance and durability of concrete structures in aggressive environments. The interest in using alternative Glass fibre-reinforced polymer (GFRP) bars lies in their corrosion resistance and higher tensile strength-to-weight ratio. Nevertheless, experimental results on the seismic behaviour of GFRP-reinforced walls are scarce. This paper investigates the hysteretic performance of hybrid steel-GFRP reinforced concrete shear walls to provide valuable experimental evidence for such walls under seismic loading. Six RC shear walls with steel and GFRP reinforcement were tested under pseudo-static reversed-cyclic lateral load. Three shear walls were reinforced by GFRP bars as longitudinal and transversal reinforcement, and two walls were reinforced with hybrid GFRP-steel bars with different ratios of web reinforcement. A reference specimen, ordinary steel-RC shear walls, was also introduced to certify the capability of GFRP as reinforcement bars. The results indicated that the GFRP-reinforced concrete slender walls had a stable hysteretic response and slight residual drift up to failure. Lower residual deformations, higher displacement capacity, and increased lateral strength could be observed with the GFRP web reinforcement ratio increase. Moreover, the fundamental period of GFRP and hybrid GFRP-steel reinforced walls can reach more than twice its original value prior to failure.
TL;DR: In this paper , the results of laboratory work on the flow and strength of cement mortars containing binary and ternary blends of portland cement, silica fume (SF), Class C fly ash (CFA) and Class F fly ash(FFA), were reported.
Abstract: This paper reports the results of laboratory work on the flow and strength of cement mortars containing binary and ternary blends of portland cement, silica fume (SF), Class C fly ash (CFA) and Class F fly ash (FFA). The cement was partially replaced with 20 and 40 wt.% of fly ash (FA) and 5 wt.% of SF as binary mixtures. Besides, the ternary mixtures contained 15%FA+5%SF and 35%FA+5%SF in place of 20% and 40% cement respectively. Both fly ashes were used in the ternary mixtures, thus, 4 mixtures containing ternary binders were prepared. Two sets of mortar mixtures having either same flow or same water/binder (W/B) ratio as those of the control mixture (containing no mineral admixture) were investigated. In total, 15 mortar mixtures were taken into constitution in the present study. The flow of mixtures was measured immediately after casting. In addition, the 7-and 28-day flexural and compressive strength of the mortar mixtures were determined. The use of SF in binary mixtures with constant W/B ratio provided the highest compressive strength (68 MPa). In ternary mixtures the use of 20%FA+5%SF mixture with constant W/B ratio showed the highest 28-day compressive strength (65 MPa). Among the mixtures with constant W/B ratio, ternary mixtures showed the lowest flow values. Besides, in the mixtures with constant flow, once again, the ternary mixtures had the highest W/B ratio. Both in binary and ternary specimens, the mixtures prepared with FFA had a higher flow than that of the CFA mixtures.