• Title/Summary/Keyword: slag cement mortar

Search Result 261, Processing Time 0.024 seconds

Strength of Alkali-Activated GGBF Slag Mortar (활성제를 사용한 슬래그 미분말 혼합 모르타르의 강도)

  • 문한영;신화철;권태석
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2001.05a
    • /
    • pp.481-486
    • /
    • 2001
  • Ground granulated blast-furnace slag shows very high strength when proper alkali-activator exists. This paper deals with setting time, heat evolution rate and the strength development of alkali-activated slag cement activated by KOH, Ca(OH$)_{2}$, $Na_{2}$ $So_{4}$ , and alum(potassium aluminum sulfate). Alkali-activated slag mortar is studied by comparison with GGBF slag cement mortar. The experimental results indicate that for moisture curing at $25^{\circ}C$, the addiction of either 4% $Na_{2}$ $So_{4}$ or 4% alum increases the strength of GGBF slag cement mortar consisting of 50% GGBF slag and 50% portland cement at early age. Strength of activated GGBF slag cement mortars at 1, 3 and 7 days exceeded that of GGBF slag cement mortar. A conduction calorimeter was used to monitor early age hydration.

  • PDF

Setting and Strength Properties of Mortar Containing Steel Furnace Slag Dust

  • Choi, Yun-Wang;Chung, Jee-Seung;Moon, Dae-Joong;Shin, Hwa-Cheol;Jang, Lee-Duck
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2003.05a
    • /
    • pp.193-196
    • /
    • 2003
  • In this paper, the experimental investigation for the setting properties of cement paste, the consistency and strength properties of mortar with steel furnace slag dust was performed and compared with those of cement paste and mortar with ground granulated blast furnace slag. When steel furnace slag dust was replaced with normal portland cement, setting time and flow value indicated to good results like as mortar with ground granulated blast furnace slag. However, mortar with steel furnace slag dust expressed to appreciably strength devaluation according to containing ratio, and did not indicate the pozzolanic reaction like as ground granulated blast furnace slag.

  • PDF

Strength Characteristics of Non-Sintered Cement Mortar Utilizing Ferro-Nickel Slag as Fine Aggregate (페로니켈슬래그를 잔골재로 사용한 비소성 시멘트 모르타르의 강도 특성)

  • Ryu, Ji-Su;Jang, Kyung-Su;Na, Hyeong-Won;Hyung, Won-Gil
    • Journal of the Korea Institute of Building Construction
    • /
    • v.23 no.4
    • /
    • pp.359-367
    • /
    • 2023
  • This experimental study investigates the replacement of conventional Portland cement and sand with non-sintered cement and ferro-nickel slag to formulate eco-friendly cement mortar. The examination aimed to understand the strength properties of non-sintered cement mortar using ferro-nickel slag as fine aggregate by classifying mortar production types, fine aggregates, and curing methodologies. From flexural and compressive strength tests, it was observed that non-sintered cement mortars, incorporating ferro-nickel slag as fine aggregate, exhibited superior strength when compared to both plain mortar and steam-cured non-sintered mortar. This increased strength is attributed to the influence of the particle size, density, and absorption capabilities of the ferro-nickel slag. Furthermore, X-ray Diffraction(XRD) analyses of the mortars verified the presence of MgO, a component of ferro-nickel slag, in the form of a composite oxide. This finding substantiates the consistent strength manifestation of non-sintered cement mortars utilizing ferro-nickel slag as a fine aggregate.

A Study on the Properties of Mortar With Particle Size of Blast Furnace Slag Powder and Curing Methods (고로슬래그미분말의 입도와 양생방법에 따른 모르터 물성에 관한 연구)

  • 김승진;박유진;조재우;김영근;김대영
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1999.10a
    • /
    • pp.191-194
    • /
    • 1999
  • Recently in Korea, may workers have reported the effects of the granulated blast furnace slag[BFS] of high fineness on the strength development of slag cement. We have studied the effect of slag fineness on the strength development of mortar with curing conditions, in order to get the basic data of high strength concrete using BFS. In this paper, we discussed the effects of slag fineness and porosity of mortar and the reaction of slag in hardened slag cement.

  • PDF

Properties of Slag Cement Mortar with Liquid Red Mud Neutralized with Sulfuric Acid (황산으로 중화시킨 액상레드머드 첨가 슬래그시멘트 모르타르의 특성)

  • Kim, Sang-Jin;Kang, Suk-Pyo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2022.11a
    • /
    • pp.123-124
    • /
    • 2022
  • In this paper, the characteristics of slag cement mortar added with neutralized liquid red mud with sulfuric acid and reduced pH were reviewed to improve the strength degradation of cement concrete added with liquid red mud. As a result, in the case of compressive strength up to 7 days, the strength of the cement mortar added with liquid red mud tends to increase compared to Plain. This shows that adding liquid red mud to cement mortar tends to increase the initial age strength, and the compressive strength on the 28th shows 74% of Plain when adding non-neutralized liquid red mud and 89% when adding sulfate neutralized red mud. Therefore, it is judged that the compression strength is improved by neutralizing the liquid red mud with sulfuric acid.

  • PDF

Properties of Slag Cement Mortar with Liquid Red Mud Neutralized with Nitric Acid (질산으로 중화시킨 액상레드머드 첨가 슬래그시멘트 모르타르의 특성)

  • Kim, Sang-Jin;Kang, Suk-Pyo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2022.11a
    • /
    • pp.165-166
    • /
    • 2022
  • In this paper, the characteristics of slag cement mortar added with neutralized liquid red mud with nitric acid to reduce pH by neutralizing liquid red mud with nitric acid were reviewed to improve strength degradation of cement concrete added with liquid red mud. As a result, the compressive strength of cement mortar added with liquid red mud was higher than that of Plain on 1 and 3 days, and the strength of red mud neutralized with nitric acid was lower than that of cement mortar added with liquid red mud on 7 days, but the strength was recovered on 28th. It was found that the addition of red mud has the effect of improving the strength in the early age.

  • PDF

Effect of Partial Replacement with Cement and Recycled Fine Aggregate on Properties of Blast Furance Slag-Based Mortar (고로슬래그 미분말 모르터에 시멘트 및 순환잔골재 치환율 변화에 따른 품질특성)

  • Kim, Young-Hee;Feng, Hai-Dong;Son, Ho-Jeong;Lee, Hyang-Jae;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2011.11a
    • /
    • pp.215-216
    • /
    • 2011
  • This study investigates the effect of partial replacement with cement on the properties of blast furnace slag-based mortar. Recycled fine aggregate with various contents was used to activate the hydration of blast furnace slag in the mortar and compared its effect on strength development. Results showed that increasing cement and recycled fine aggregate increased the strength of mortar specimens. However, this study found that the mortar made with partial replacement of river sand with recycled fine aggregate of 20% developed a similar strength to the strength that cement with 10% can achieved.

  • PDF

Hardening Characteristics and Microstructure Analysis of Blast Furnace Slag-Cement Mortar Replaced Alpha-calcium Sulfate Hemihydrate (알파반수석고 치환 고로슬래그 시멘트 모르타르의 경화특성 및 미세구조 분석)

  • Kim, Gyeong-Tae;Kim, Gyu-Yong;Lee, Bo-Kyeong;Yoon, Min-Ho;Lee, Sang-Kyu;Seo, Won-Woo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2017.05a
    • /
    • pp.18-19
    • /
    • 2017
  • In this study, hardening characteristics and microstructure of blast furnace slag-cement mortar replaced alpha-calcium sulfate hemihydrate were analyzed. As a result of replacing alpha-calcium sulfate hemihydrate with 0, 10, 20, 30%, it was confirmed that the initial and final setting times are faster than that of blast furnace slag-cement mortar. The compressive strength of the specimens containing alpha-calcium sulfate hemihydrate decreased in the range of 42 ~ 76% at age 28 days compared with blast furnace slag-cement mortar. In the case of replacing the alpha-calcium sulfate hemihydrate, the shrinkage did not occur more rapidly than the cement mortar, but the slope of the strain curve showed a linear behavior. The results of scanning electron microscopy images analysis showed that the formation of ettringite was increased at alpha-calcium sulfate hemihydrate replaced mortar.

  • PDF

Rheology Properties of Belite-rich Cement Mortar Added Blastfurnace Slag and Polycarbonate-based Superplasticizer (고로슬래그와 폴리카르본산계 유기 혼화제를 첨가한 Belite-rich Cement 모르타르 유동특성)

  • 송종택;송종택;조현태;황인수;박춘근
    • Journal of the Korean Ceramic Society
    • /
    • v.37 no.2
    • /
    • pp.145-151
    • /
    • 2000
  • In order to investigate the rheological properties of belite-rich cement(BRC) added polycarbonate-based superplasticizer and blastfurnace slags which have different blaines at 4500, 6000 and 8000$\textrm{cm}^2$/g, the change of minislumps and mortar slumps are measured with time. The rheological properties improve as specific surface area of added slag decreases or amount of polycarbonate-based superplasticizer increases. The slump loss can be controlled effectively by the steric hinderance effect of polycarbonate-based superplasticizer. According to the results, when mix proportion of the mortar is 1.5% mass content of superplasticizer and 30% mass addition of blastfurnace slag which blaine is 4500$\textrm{cm}^2$/g, the best mortar slump can be achieved without any significant segregation of materials.

  • PDF

Application of Ferronickel Slag Aggregate to Improve Workability and Strength of Non-Sintered Cement Mortar (비소성 시멘트 모르타르의 작업성 및 강도 개선을 위한 페로니켈슬래그 골재의 적용방안)

  • Jang, Kyung-Soo;Na, Hyeong-Won;Hyung, Won-Gil
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2023.05a
    • /
    • pp.309-310
    • /
    • 2023
  • Slag and ash generally have a higher powder degree than portland cement, so workability may deteriorate under the same unit quantity condition, and strength and durability decrease when the unit quantity is increased. At this time, if an aggregate having a low water absorption and an appropriate particle size is used to recover the loss of strength, it can contribute to reducing the unit quantity of the binder. Therefore, for the purpose of improving the workability and strength of non-sintered cement mortar using slag and ash, ferro nikel slag whose particle size was adjusted was used as an aggregate and its applicability was identified. In this experimental condition, it was confirmed that non-sintered cement mortar tends to improve workability and secure strength when ferro nikel slag having various particle size distributions is used as an aggregate. This can be analyzed as the effect of ferro nikel slag material properties including glassy properties and mixing conditions with a wide particle size distribution.

  • PDF