Improved processing of blended slag cement through mechanical activation

Kumar, Sanjay; Bandopadhyay, Amitava; Rajinikanth, V.; Alex, T C; Kumar, Rakesh

doi:10.1023/b:jmsc.0000026948.85440.cc

Cited by 65 publications

(14 citation statements)

References 5 publications

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“…The fine slag passing this sieve (32µm) was named as slag super-fine (SSF). Like GGW, effect of fineness of EAFS (SF and SSF) on its pozzolanic potential was also evaluated as suggested in previous studies [41,42]. This is because high fineness increases the surface area, thus leads to increased reactivity and ultimate strength values [43,44].…”

Section: Electric Arc Furnace Slagmentioning

confidence: 99%

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Influence of Fineness of Recycled Glass Waste and Slag on Compressive Strength of Sulphate Resisting Cement Mortars

Amin¹

2017

TOBCTJ

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Background: Cement and concrete industry is responsible for 5% of the worldwide man-made CO2 emission to environment. Therefore, the demands of producing low carbon concrete is increasing every day for climate change mitigation and adaptations. Objective: To minimize the amount of clinker production and associated CO2 emission, the potential use of recycled ground glass waste (GGW) and electric arc furnace slag (EAFS) as a substitute of cement was evaluated through compressive strength tests on mortars and by calculating their strength activity index (SAI) values. Method: At first, two optimized fineness levels were attained for both cement substituting materials used in this study (GGW as glass fine ˂ 38µm (GF), glass superfine ˂ 25µm (GSF) and EAFS as slag fine ˂ 75µm (SF), slag superfine ˂ 32µm (SSF)). In addition to control mortar (CM), four types of binary mortar mixtures were cast by substituting cement 5-20% with GGW (GF and GSF) and 10-30% with EAFS (SF and SSF). ASTM C109 and C311 were employed to perform compressive strength tests and to calculate the SAI values, respectively. Results: The results demonstrated that the strength of mortar increased with increasing fineness of both the cement substitute materials. More specifically, the compressive strength of mortar containing GSF matched with those of CM at 5% substitution and comparable for its other substitutions (10, 15, and 20%) at age of one-year. Similar results were noticed for SSF at its 10% substitution where it produced the best comparable results to CM. However, the strength of mortars containing SF or 30% SSF was significantly reduced as compared to CM. Conclusion: Almost all the mortars containing GGW or EAFS have satisfied the strength activity criteria of ASTM C989 Grade 80 of blast furnace slag, except those containing 20 and 30% of SF. Moreover, the mortars containing GSF and SSF matched BFS of Grade 100 corresponding to their 5 and 10% substitutions, respectively.

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Section: Electric Arc Furnace Slagmentioning

confidence: 99%

“…However, to meet BFS of Grade100 the cement substitution must be restricted to 10% SSF or 5% GSF. The results revealed that high fineness of EAFS exhibited better filling, hydration and pozzolanic properties [42,48,49].…”

Section: Comparison Of Strength Activity Index and Compressive Strengthmentioning

confidence: 99%

Influence of Fineness of Recycled Glass Waste and Slag on Compressive Strength of Sulphate Resisting Cement Mortars

Amin¹

2017

TOBCTJ

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“…They tested several levels of limestone additions ranging from 0 to 35% and determined that use of a quality limestone (70% CaCO 3 ) with optimum levels and fineness of both limestone and clinker are the prerequisites to achieve best results for the short-as well as long-term performances. Kumar et al (2004) noted that the strength properties of cement largely depend on fine grinding of blended cement constituents. Using a slag-cement blend as the model, they used controlled grinding to mechanically activate the constituents, namely the clinker and the slag.…”

Section: Dilution Of the Cementmentioning

confidence: 99%

Specifications and Protocols for Acceptance Tests on Processing Additions in Cement Manufacturing

Taylor¹

2008

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Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM Systematic, well-designed research provides the most effective approach to the solution of many problems facing highway administrators and engineers. Often, highway problems are of local interest and can best be studied by highway departments individually or in cooperation with their state universities and others. However, the accelerating growth of highway transportation develops increasingly complex problems of wide interest to highway authorities. These problems are best studied through a coordinated program of cooperative research. In recognition of these needs, the highway administrators of the American Association of State Highway and Transportation Officials initiated in 1962 an objective national highway research program employing modern scientific techniques. This program is supported on a continuing basis by funds from participating member states of the Association and it receives the full cooperation and support of the Federal Highway Administration, United States Department of Transportation. The Transportation Research Board of the National Academies was requested by the Association to administer the research program because of the Board's recognized objectivity and understanding of modern research practices. The Board is uniquely suited for this purpose as it maintains an extensive committee structure from which authorities on any highway transportation subject may be drawn; it possesses avenues of communications and cooperation with federal, state and local governmental agencies, universities, and industry; its relationship to the National Research Council is an insurance of objectivity; it maintains a full-time research correlation staff of specialists in highway transportation matters to bring the findings of research directly to those who are in a position to use them. The program is developed on the basis of research needs identified by chief administrators of the highway and transportation departments and by committees of AASHTO. Each year, specific areas of research needs to be included in the program are proposed to the National Research Council and the Board by the American Association of State Highway and Transportation Officials. Research projects to fulfill these needs are defined by the Board, and qualified research agencies are selected from those that have submitted proposals. Administration and surveillance of research contracts are the responsibilities of the National Research Council and the Transportation Research Board. The needs for highway research are many, and the National Cooperative Highway Research Program can make significant contributions to the solution of highway transportation problems of mutual concern to many responsible groups. The program, however, is intended to complement rather than to substitute for or duplicate other highway research programs.

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“…Pozzolans are frequently used as an additive to Portland cement concrete mixtures to increase their long-term strength and durability to reduce the concrete's material costs in some cases by decreasing the cement consumption (Cook, 1986), and to eliminate thermal process problems (Kumar et al, 2004). However, it is well known that the addition of natural pozzolans to the cement mix usually decreases their compressive strength (Shi and Day, 2001).…”

Section: Introductionmentioning

confidence: 99%