STUDY ON EVALUATION METHOD OF CO2 ABSORPTION AND PHYSICAL PROPERTIES OF CEMENTITIOUS MATERIALS WITH CARBONATION CURING

2021 ◽  
Vol 77 (2) ◽  
pp. 37-54
Author(s):  
Takeshi TORICHIGAI ◽  
Kosuke YOKOZEKI ◽  
Ichiro YOSHIOKA ◽  
Minoru MORIOKA
Keyword(s):  
Physical Properties ◽  
Evaluation Method ◽  
Cementitious Materials ◽  
Carbonation Curing

scholarly journals Effect of Graphene Oxide Nanosheets on Physical Properties of Ultra-High-Performance Concrete with High Volume Supplementary Cementitious Materials

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1929 ◽  
Author(s):  
Yu-You Wu ◽  
Jing Zhang ◽  
Changjiang Liu ◽  
Zhoulian Zheng ◽  
Paul Lambert
Keyword(s):  
Graphene Oxide ◽  
Physical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
High Volume ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Ultra High Performance Concrete ◽  
Steam Curing ◽  
Slump Flow

Nanomaterials have been increasingly employed for improving the mechanical properties and durability of ultra-high-performance concrete (UHPC) with high volume supplementary cementitious materials (SCMs). Recently, graphene oxide (GO) nanosheets have appeared as one of the most promising nanomaterials for enhancing the properties of cementitious composites. To date, a majority of studies have concentrated on cement pastes and mortars with fewer investigations on normal concrete, ultra-high strength concrete, and ultra-high-performance cement-based composites with a high volume of cement content. The studies of UHPC with high volume SCMs have not yet been widely investigated. This paper presents an experimental investigation into the mini slump flow and physical properties of such a UHPC containing GO nanosheets at additions from 0.00 to 0.05% by weight of cement and a water–cement ratio of 0.16. The study demonstrates that the mini slump flow gradually decreases with increasing GO nanosheet content. The results also confirm that the optimal content of GO nanosheets under standard curing and under steam curing is 0.02% and 0.04%, respectively, and the corresponding compressive and flexural strengths are significantly improved, establishing a fundamental step toward developing a cost-effective and environmentally friendly UHPC for more sustainable infrastructure.

PHYSICAL PROPERTIES AND ENVIRONMENTAL PERFORMANCE OF STEAM-CURED CONCRETE CONTAINING FLUE-GAS DESULFURIZATION GYPSUM

2021 ◽  
Vol 16 (1) ◽  
pp. 3-15
Author(s):  
Hongseok Jang ◽  
Seungyoung So
Keyword(s):  
Physical Properties ◽  
Flue Gas ◽  
Environmental Performance ◽  
Cementitious Materials ◽  
Flue Gas Desulfurization ◽  
Test Results ◽  
Fgd Gypsum ◽  
Environmental Test ◽  
Environmentally Safe ◽  
Increased Strength

ABSTRACT Flue-gas desulfurization (FGD) gypsum has occasionally been used as an additive to cement. Consequently, appropriate facilities are required to ensure the environmentally safe processing of FGD gypsum and the resulting cement material properties. Such facilities are yet to be developed because the amount of FGD gypsum used is still small when compared with the vast amounts of FGD gypsum generated. In this study, we analyze the effect of FGD gypsum addition on the physical properties, stabilization, and radon count of steam-cured mortar and compare its performance with air-cured mortar. Our results show that the steam-cured pozzolanic hydration products of ettringite and C-S-H promote the densification of the mortar structure, thereby resulting in nanopore size reduction and increased strength of FGD gypsum mortar subsequent to the steam-cured hydration process. Further, our environmental test results indicate that steam-cured pozzolanic materials composed of FGD gypsum are environmentally safer than air-cured cementitious materials.

A Review on the Effects of Various Supplementary Cementitious Materials on Physical Properties of Hardened Concrete

2014 ◽  
Vol 905 ◽  
pp. 287-291
Author(s):  
Salim Barbhuiya ◽  
Hamid Nikraz
Keyword(s):  
Physical Properties ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Hardened Concrete ◽  
Granulated Blast Furnace Slag ◽  
Current Trends ◽  
Fuel Ash ◽  
Treatment And Disposal ◽  
Furnace Slag ◽  
By Products

The global development and current trends in social attitude are resulting in an increase in the amount of waste generated by society, the treatment and disposal of which are becoming a serious problem. Therefore, waste management is one of the most important aspects in ensuring sustainable development in todays world. Some of the industrial by-products, such as pulverised-fuel ash (PFA), ground granulated blast-furnace slag (GGBS) and microsilica (MS) can be used in concrete to improve its properties. In this paper the influence of various by-products on the physical properties of concrete is reviewed.

scholarly journals Characteristics and Applications of Sugar Cane Bagasse Ash Waste in Cementitious Materials

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 39 ◽  
Author(s):  
Qing Xu ◽  
Tao Ji ◽  
San-Ji Gao ◽  
Zhengxian Yang ◽  
Nengsen Wu
Keyword(s):  
Physical Properties ◽  
Sugar Cane ◽  
Construction Material ◽  
Construction Materials ◽  
Mineralogical Composition ◽  
Cementitious Materials ◽  
Sugar Cane Bagasse ◽  
Hardened Concrete ◽  
Crystal Silicon ◽  
Sugar Cane Bagasse Ash

Sugar cane bagasse ash (SCBA) is an abundant byproduct of the sugar and ethanol industry. SCBA is generally used as a fertilizer or is disposed of in landfills, which has led to intensified environmental concerns. In recent years, SCBA research has mainly been focused on utilization in construction materials due to the abundance and pozzolanic characteristics of SCBA. In this paper, a comprehensive review of the state-of-the-art morphology, physical properties, chemical composition, and mineralogical composition of SCBA is presented. Studies indicate that SCBA is a potentially promising construction material. The applications of SCBA as a pozzolanic material, a new source for preparing alkali-activated binders, aggregates, and fillers in construction materials, are summarized. The impacts of SCBA on fresh and hardened concrete properties are highlighted, including the physical properties, mechanical strength, microstructure, and durability. Key factors that govern pozzolanic activity are discussed in detail, including calcination and recalcination temperatures, and durations, fineness, loss on ignition (LOI), and crystal silicon dioxide. Finally, further research on the optimal and broad utilization of SCBA in construction materials is recommended.

Monitoring of Selected Physical and Thermal Properties of Lightweight Concrete Based on Recycled Foam Plastics

2018 ◽  
Vol 776 ◽  
pp. 46-50
Author(s):  
Andrea Daubnerová ◽  
Stanislav Unčík
Keyword(s):  
Thermal Properties ◽  
Physical Properties ◽  
Bulk Density ◽  
Vinyl Acetate ◽  
Evaluation Method ◽  
Lightweight Concrete ◽  
Strength Characteristics ◽  
Ethyl Vinyl ◽  
Foam Plastics

This paper aims to verify the use of recycled foam plastics to produce lightweight concrete. Two types of recycled foam plastics (ethyl vinyl acetate and cable insulator) and their mixture in ratios 3:1, 1:1 and 1:3 were used as filler. An organic-based adhesive, Conipur 360, was used as a binder. The evaluation method included verify one of basic physical properties – bulk density. At the same time, thermal properties and strength characteristics of the samples were monitored.

Evaluation method for low to ultralow permeability reservoirs based on pore-throat structure: A case study in the eastern Nanpu Sag, Bohai Bay Basin, China

2020 ◽  
pp. 1-47
Author(s):  
Xiaodong Zhao ◽  
Shilin Wang ◽  
Jingxu Yang ◽  
Boming Zhang ◽  
Liang Li ◽  
...  
Keyword(s):  
Physical Properties ◽  
Evaluation Method ◽  
Maximum Pressure ◽  
Bohai Bay ◽  
Pore Throat ◽  
Bohai Bay Basin ◽  
Throat Radius ◽  
Thin Sections ◽  
Nanpu Sag ◽  
Ultralow Permeability

The pore-throat structure of low to ultralow permeability reservoirs is complex, causing the permeability to vary greatly under similar porosity conditions. And the pore-throat structures are the key factors that controlled the physical properties of such kind of reservoirs. Therefore, conventional reservoir evaluation methods can hardly meet the research needs of low to ultralow permeability reservoir exploration and development. We conducted our research on Paleogene Shahejie and Neogene Dongying low to ultralow permeability reservoirs in the eastern Nanpu Sag of the Bohai Bay Basin in order to address this issue. Cores, thin sections and scanning electron microscope were used to analyze the pore-throat structures in order to determine the characteristics of low to ultralow permeability reservoirs and a new parameter for evaluating low to ultralow permeability reservoirs is proposed. The results of this research show that primary pores, secondary pores and micro-fractures are developed in the study area, and the pore-throat shape is mainly flaky or curved flaky. The microscopic pore-throat structure controlled the reservoir physical properties and fluid mobility of these reservoirs, the permeabilities of these reservoirs are dependent on the pore throats, and the correlation between connected pores and permeability is strong. Based on the analysis of the pore-throat structure, as well as the maximum mercury saturation and the residual mercury saturation at the maximum pressure and the minimum pressure obtained by the mercury injection test, an evaluation of the reservoir by using the mobility parameter of fluid is proposed, and the pore-throat radius R15 obtained by the mercury intrusion experiment has the best correlation with the fluid mobility parameters. The mobility parameters of fluid can effectively improve the accuracy of logging interpretation of low to ultralow permeability reservoirs and provide a scientific basis for the scale stimulation and effective development of low to ultralow permeability reservoirs.

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