scholarly journals Influence of Vacuum Mixing on the Carbonation Resistance and Microstructure of Reactive Powder Concrete Containing Secondary Copper Slag as Supplementary Cementitious Material (SCM)

2017 ◽  
Vol 171 ◽  
pp. 534-542 ◽  
Author(s):  
Romy Suryaningrat Edwin ◽  
Elke Gruyaert ◽  
Jeroen Dils ◽  
Nele De Belie
Keyword(s):  
Copper Slag ◽  
Cementitious Material ◽  
Reactive Powder Concrete ◽  
Supplementary Cementitious Material ◽  
Carbonation Resistance ◽  
Reactive Powder ◽  
Vacuum Mixing

Effects of Packing Degree and Calcium-Silicon Ratio of Cementitious Material on Strength of Reactive Powder Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 1034-1037
Author(s):  
Tao Ji ◽  
Bao Chun Chen ◽  
Yi Zhou Zhuang ◽  
Zhi Bin Huang ◽  
Yong Ning Liang
Keyword(s):  
Silicon Dioxide ◽  
Cementitious Materials ◽  
Strength Test ◽  
Cementitious Material ◽  
Molar Ratio ◽  
Reactive Powder Concrete ◽  
Mix Proportion ◽  
Study Results ◽  
Calcium Silicon ◽  
Reactive Powder

Aim & Goff model was used to predict the packing degree of cementitious materials including cement and silica fume. The mix proportions of reactive powder concrete (RPC) with different packing degree and calcium-silicon ratio of cementitious materials were designed and a strength test was carried out. The study results reveal that the flexural strength and compressive strength of RPC are related to the packing degree and calcium-silicon ratio of cementitious materials. For the mix proportion of RPC with the calcium- silicon molar ratio of 1.353 that is slightly less than the theoretical value of 1.42, where calcium hydroxide can react with silicon dioxide more fully, its strength of RPC approaches summit although its packing degree of cementitious material is not the largest one.

Effects of Packing Density and Calcium- Silicon Ratio of Ternary Cementitious Material System on Strength of Reactive Powder Concrete

2011 ◽  
Vol 261-263 ◽  
pp. 197-201
Author(s):  
Tao Ji ◽  
Bao Chun Chen ◽  
Feng Li ◽  
Yi Zhou Zhuang ◽  
Zhi Bin Huang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Packing Density ◽  
Cementitious Material ◽  
Reactive Powder Concrete ◽  
Material System ◽  
Mix Proportion ◽  
Study Results ◽  
Calcium Silicon ◽  
Reactive Powder

Aim & Goff model was used to predict the packing density of cementitious material including cement, ultra-pulverized fly ash and silica fume. The mix proportions of reactive powder concrete (RPC) with different packing density and calcium-silicon ratio of cementitious material were designed, and a strength test was carried out. The study results reveal that the flexural strength and compressive strength of RPC are related to the packing density and calcium-silicon ratio of cementitious material. For the mix proportion of RPC with the calcium-silicon ratio of 1.179, calcium hydroxide reacts with silicon dioxide fully, and the superfluous ultra-pulverized fly ash and silica fume fill the voids of RPC. The packing density of its cementitious material is the largest, and its strength approaches summit.

scholarly journals Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties

2019 ◽  
Vol 4 ◽  
pp. 89-102 ◽  
Author(s):  
Alice T Bakera ◽  
Mark G Alexander
Keyword(s):  
Portland Cement ◽  
Cementitious Material ◽  
Concrete Durability ◽  
Western Cape ◽  
Supplementary Cementitious Material ◽  
Durability Properties ◽  
Carbonation Resistance ◽  
Performance Results ◽  
Local Materials ◽  
Durability Performance

Numerous research efforts on metakaolin as a supplementary cementitious material (SCM) have been undertaken in the past 20 years. This material, while relatively expensive mainly due to low production volumes worldwide, nevertheless has a significantly lower production cost than Portland cement. However, industry remains tentative in considering metakaolin in concrete. This paper takes the view that industry should consider investing in the production and application of metakaolin in appropriate concrete projects, particularly in aggressive environments where plain Portland cement may be inadequate, and where other SCMs may not readily be available. The main contribution of the paper is a global review of recent studies on the use of metakaolin in different types of concrete. This international experience is then compared with results from a study on the durability performance of metakaolin concrete using local materials in the Western Cape province of South Africa, as a means of concrete performance improvement. The study investigates concrete durability properties: penetrability (sorptivity, permeability, conductivity and diffusion), mitigation of Alkali-Silica Reaction (ASR), and carbonation resistance. The concretes were prepared with three water-binder ratios (0.4, 0.5 and 0.6), and with metakaolin replacement levels of 0% (control), 10%, 15% and 20%. Performance results show that, with increasing metakaolin content, the transport properties of concrete are considerably improved, ASR expansion due to a highly reactive local aggregate decreases to non-deleterious levels, while no detrimental effect on carbonation is observed. Thus, metakaolin could serve as a valuable SCM to enhance the durability performance of concrete in local aggressive environments.

scholarly journals Copper Slag Blended Cement: An Environmental Sustainable Approach for Cement Industry in India

2016 ◽  
Vol 11 (1) ◽  
pp. 186-196
Author(s):  
Jagmeet Singh ◽  
Jaspal Singh ◽  
Manpreet Kaur
Keyword(s):  
Blended Cement ◽  
Copper Slag ◽  
Cementitious Materials ◽  
Strength Test ◽  
Cementitious Material ◽  
Cement Industry ◽  
Supplementary Cementitious Materials ◽  
Material Strength ◽  
Test Results ◽  
Supplementary Cementitious Material

Indian cement industry is facing environmental issue of emission of carbon dioxide (CO2), a greenhouse gas. Blended cements including supplementary cementitious materials are substitute of Portland cement to reduce CO2 emission. The present paper investigates theappropriateness of copper slag (CS) as supplementary cementitious material. Strength properties and hydration of mixes were determined at different replacement levels of CS with cement. Compressive, flexural and tensile strength of each mix was found out at different curing periods. The hydration of cement was investigated through X-ray diffraction (XRD). The strength test results showed that substitution of up to 20% of CS can significantly replace Portland cement.XRD test results were corresponding to strength test results. The present study encourages the utilization of CS as supplementary cementitious material to make economical and environmentally sustainable blended cement

scholarly journals Effects of nano silica on carbonation resistance of concrete

2019 ◽  
Vol 275 ◽  
pp. 02001
Author(s):  
Xin Wan ◽  
Chun-fa Su ◽  
Leo Gu Li
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Cementitious Material ◽  
Nano Materials ◽  
Nano Silica ◽  
Carbonation Depth ◽  
Supplementary Cementitious Material ◽  
Carbonation Resistance ◽  
Cost Of Production

In tandem with recent development of nanotechnology and reduction in cost of production, many nano-materials have been tried in concrete. In this study, the effect of nano silica (NS) on the carbonation resistance of concrete was investigated by producing a number of trial concrete mixes with varying water and NS contents for carbonation depth test. The results demonstrated that the addition of NS could significantly reduce the 28-day and 56-day carbonation depths of concrete, indicating that NS may be a promising supplementary cementitious material for producing high-performance concrete.

Copper slag: The leaching behavior of heavy metals and its applicability as a supplementary cementitious material

2021 ◽  
Vol 9 (2) ◽  
pp. 105132
Author(s):  
Rongxing He ◽  
Shiyu Zhang ◽  
Xiaolong Zhang ◽  
Zhaohao Zhang ◽  
Yingliang Zhao ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Copper Slag ◽  
Cementitious Material ◽  
Leaching Behavior ◽  
Supplementary Cementitious Material

INVESTIGATION OF USING WASTE GLASS POWDER AS A SUPPLEMENTARY CEMENTITIOUS MATERIAL IN REACTIVE POWDER CONCRETE

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Shatha Hasan ◽  
Doaa Nayyef
Keyword(s):  
Compressive Strength ◽  
Glass Powder ◽  
Waste Glass ◽  
Reactive Powder Concrete ◽  
Concrete Aggregate ◽  
Supplementary Cementitious Material ◽  
Recycled Glass ◽  
Waste Glass Powder ◽  
Reactive Powder ◽  
Direct Tensile

Some mechanical behaviors were tested by investigations of compressive strength, and direct tensile, strength of reactive Powder concrete (RPC) containing recycled glass powder (RGP) as a supplementary, cementitious material. This study goals to survey the pozzolanic activity of recycled glass powder (RGP) up to (30%) silica fume replacement and its effect on the properties of recycled reactive powder concrete (RRPC) that made by waste glass (WG) and recycled fine concrete aggregate, which has not been investigated before. These properties contain compressive strength and direct tensile strength. Glass is principally composed of silica so that when waste glass is grind to micro particle size in RPC as a partial replacement of silica fume could be a substantial step to development of sustainable material. In this study, high strength reactive powder concrete (HSRPC) with mean compressive strength of 118.4 MPa at 28 days slightly decreased when 40% recycled fine concrete aggregate were used then the strength evolve afterward when 20% of waste glass powder WGP was utilized. The strength tests outcomes indicated that waste glass powder gave greater strength compared to ordinary reactive powder concrete.

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