scholarly journals Partial replacement of copper slag with treated crumb rubber aggregates in alkali-activated slag mortar

2020 ◽  
Vol 256 ◽  
pp. 119468 ◽  
Author(s):  
Farshad Ameri ◽  
Parham Shoaei ◽  
Hamid Reza Musaeei ◽  
Seyed Alireza Zareei ◽  
Chee Ban Cheah
Keyword(s):  
Copper Slag ◽  
Crumb Rubber ◽  
Partial Replacement ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Rubber Aggregates ◽  
Alkali Activated

Influence of Industrial By-Products on Shrinkage of Alkali-Activated Slag

2014 ◽  
Vol 1000 ◽  
pp. 137-140
Author(s):  
Vlastimil Bílek Jr. ◽  
Lukáš Kalina ◽  
Eva Bartoníčková ◽  
Tomáš Opravil
Keyword(s):  
Fly Ash ◽  
Partial Replacement ◽  
Cement Kiln ◽  
Hydration Products ◽  
Fluidized Bed Combustion ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Kiln Dust ◽  
By Products ◽  
Alkali Activated

One of the highest shortages of alkali-activated slag (AAS) is high shrinkage, both autogenous and drying. One of the possibilities of lowering the shrinkage is partial replacement of slag by suitable admixtures, which can act for example through the forming of expansive hydration products. In this study, 0–50 % of slag was replaced by by-pass cement kiln dust and fluidized bed combustion fly ash. Promising results were obtained especially in the case of fly ash. By using admixtures at higher dosages compressive strengths were reduced.

Chloride Resistance of Alkali Activated Slag Pastes with Fly Ash Replacement

2016 ◽  
Vol 851 ◽  
pp. 98-103
Author(s):  
Ladislav Pařízek ◽  
Vlastimil Bílek Jr. ◽  
Matěj Březina
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Raw Materials ◽  
High Energy ◽  
Partial Replacement ◽  
Alkali Activated Slag ◽  
Practical Applications ◽  
Chloride Resistance ◽  
Activated Slag ◽  
Alkali Activated

High energy requirements due to producing of Portland cement leads to a tendency to use secondary raw materials or completely new kind of materials. One of the possibilities is using the materials based on alkali activated slag (AAS). In this paper the influence of partial replacement of ground granulated blast furnace slag by fly ash in AAS pastes on mechanical properties and porosity of was investigated. For practical applications it is also necessary to know their resistance to environment such as salty water. Chloride resistance was investigated by setting the experiment as external chloride attack and measuring the changes of mechanical properties, porosity and composition of the pastes.

scholarly journals Flexural Fatigue performance of Alkali Activated Slag Concrete mixes incorporating Copper Slag as Fine Aggregate

2015 ◽  
Vol 10 (1) ◽  
pp. 7-18 ◽  
Author(s):  
B.M. Mithun ◽  
M.C. Narasimhan ◽  
Palankar Nitendra ◽  
A.U. Ravishankar
Keyword(s):  
Mechanical Properties ◽  
Plain Concrete ◽  
Copper Slag ◽  
Fatigue Performance ◽  
Fine Aggregate ◽  
River Sand ◽  
Alkali Activated Slag ◽  
Fine Aggregates ◽  
Activated Slag ◽  
Alkali Activated

Abstract The present investigation attempts a detailed study of mechanical properties and fatigue characteristics of a new class of Alkali Activated Slag Concrete (AASC) mixes incorporating Copper Slag (CS) as fine aggregates. The natural river sand is replaced with Copper Slag, upto 100% (by volume) as fine aggregate in these AASC mixes. The behavior of plain concrete prisms, cast with this range of AASC mixes under dynamic cyclic loads with sand/CS fine aggregates is studied and is compared with conventional OPC-based concrete specimens. The results indicate that incorporation of CS even upto 100% as fine aggregates, did not have any adverse effects on the mechanical properties of AASC mixes. The AASC mixes with CS displayed slightly better fatigue performance as compared to AASC mix with river sand. An attempt is also made herein to statistically describe the fatigue life data of AASC mixes using a 2-parameter Weibull distribution.

Rheology, shrinkage and pore structure of alkali-activated slag-fly ash mortar incorporating copper slag as fine aggregate

2020 ◽  
Vol 242 ◽  
pp. 118029 ◽  
Author(s):  
Nanqiao You ◽  
Yongchao Liu ◽  
Dawei Gu ◽  
Togay Ozbakkaloglu ◽  
Jinlong Pan ◽  
...  
Keyword(s):  
Fly Ash ◽  
Pore Structure ◽  
Copper Slag ◽  
Fine Aggregate ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

scholarly journals Effect of CaO on the Autogenous Shrinkage of Alkali-Activated Slag Mortar

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Dengdeng Zheng ◽  
Tao Ji ◽  
Guojie Wang
Keyword(s):  
Autogenous Shrinkage ◽  
Magic Angle Spinning ◽  
Partial Replacement ◽  
Hydration Reaction ◽  
Magic Angle ◽  
Promising Alternative ◽  
Alkali Activated Slag ◽  
Angle Spinning ◽  
Activated Slag ◽  
Alkali Activated

The autogenous shrinkage of alkali-activated slag (AAS) is significantly higher than that of ordinary Portland cement (OPC). The higher risk of concrete cracking due to autogenous shrinkage is a critical drawback to wider use of this promising alternative binder. The effect of CaO content on the autogenous shrinkage of AAS mortar was investigated. The autogenous shrinkage of AAS mortars was determined by comparator. The pore structure of the pastes was determined by mercury intrusion porosimetry. The hydration products of the pastes were determined by Fourier transform-infrared, thermogravimetric analysis, X-ray diffraction, and 29Si solid-state magic-angle spinning nuclear magnetic resonance. The results show that the amount of portlandite increases as CaO content increases. CaO in the paste causes the partial replacement of C-S-H(I) (low stiffness) by C-S-H(II) (high stiffness). The hydration reaction of AAS is inhibited by the addition of CaO. The increase of polymerization degree of C-(A-)S-H and rearrangement of C-S-H(I) during hydration are inhibited by the addition of CaO, and micropores closure is also inhibited. Therefore, the autogenous shrinkage of AAS mortar decreases with the increase of CaO content.

scholarly journals Utilization of Treated Agricultural Residue Ash as Sodium Silicate in Alkali Activated Slag Systems

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 329
Author(s):  
Feraidon F. Ataie
Keyword(s):  
Compressive Strength ◽  
Size Structure ◽  
Drying Shrinkage ◽  
Partial Replacement ◽  
Agricultural Residue ◽  
Alkali Activated Slag ◽  
Alternative Sources ◽  
Activated Slag ◽  
Alkali Activated ◽  
Straw Ash

This study investigated the influence of rice straw ash (RSA), rice husk ash (RHA), and silica fume (SF) on alkali activated slag (AAS) systems. RSA, RHA, and SF were treated with sodium hydroxide to improve their reactivity in AAS systems. Although addition of SF in AAS systems increased compressive strength, samples containing RSA or RHA had higher compressive strength than those having SF. Treated RSA or RHA further increased compressive strength of AAS samples. It was shown that samples containing treated ash samples had similar compressive strength to those made with sodium silica activator. Therefore, it is suggested that treated ash samples could be used as alternative sources of silica for AAS. Drying shrinkage of AAS samples increased considerably when treated RSA or RHA were used as partial replacement of slag. This could be attributed to higher silica modulus (SiO2/Na2O) ratio of samples containing treated ash, which in turn would lead to a finer pore size structure compared to control samples. However, SF significantly reduced drying shrinkage of AAS. This could be because SF reduces the permeability and porosity of AAS samples.

Sign in / Sign up

Export Citation Format

Share Document