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The Properties of Ground Granulated Blast Furnace Slag Lightweight Aggregate (GLA) at Various Molar Ratio and Its Application in Concrete

Razak Rafiza Abd, Hassan Mohd Akhmal, Abdullah Mohd Mustafa Al Bakri, Yahya Zarina, Ariffin Mohd Azreen Mohd, Mansor Ahmad Faizal B., Hao Dickson Ling Chuan

Archives of Metallurgy and Materials

2023

Vol. 68, iss. 3

991-996

The effects of supplementary cementitious materials (SCM) on the characteristics and internal structure of synthetic aggregate made from ground granulated blast furnace slag are investigated in this study (GGBS). Due to its high pozzolanic activity, GGBS was shown to be superior to other SCM materials, enhancing both the strength and durability of synthetic aggregate. Because sintering uses a lot of energy and generates a lot of pollutants, using a cold-bonded approach to make low density lightweight aggregates is particularly significant from an economic and environmental standpoint. Thus, the utilisation of ground granulated blast furnace slag (GGBS) as a substitute material in the production of green artificial lightweight aggregate (GLA) using the cold bonding method was discussed in this work. Admixtures of ADVA Cast 203 and Hydrogen Peroxide were utilised to improve the quality of GLA at various molar ratios. The freshly extracted GLA was then evaluated for specific gravity, water absorption, aggregate impact, and aggregate crushing in order to determine the optimal proportion blend. As a result, the overall findings offer great application potential in the development of concrete (GCLA). It has been determined that aggregates with a toughness of 14.6% and a hardness of 15.9% are robust. The compressive strength test found that the GCLA has a high strength lightweight concrete of 37.19 MPa and a density of 1845.74 kg/m3. The porous features developed inside the internal structure of GLA have led to GCLA’s less weight compared to conventional concrete.

Wpływ temperatury na wytrzymałość doczołowego złącza Al-Cu uzyskanego metodą obróbki plastycznej na zimno

Woźniak H., Borowski J., Jóźwiak K., Samolczyk J.

Obróbka Plastyczna Metali

2005

T. 16, nr 5

39-48

Opisano wyniki badań wpływu temperatury na wytrzymałość złączy aluminium-miedź (Al-Cu) wykonanych technologią obróbki plastycznej na zimno. Odcinki prętów spajano metodą spęczania ich końców. Próbki wyżarzano w temperaturze 300, 400, 530, 540 i 570°C, stosując różny czas wygrzewania i różne sposoby chłodzenia. Badania strukturalne wykazały, że począwszy od temperatury 400°C w złączu powstaje strefa twardych i kruchych związków międzymetalicznych CuAl, CuAl2, CuAl2O4, Cu9Al4, układających się w przylegające do siebie warstwy o łącznej grubości od 30 do 100 žm. Wszystkie złącza zawierające związki międzymetaliczne pękały w próbie gięcia przy sile kilkakrotnie mniejszej od siły potrzebnej do wygięcia danej próbki w stanie niewyżarzonym. Stwierdzono, że wartość siły pękania jest tym mniejsza im wyższa była temperatura nagrzania złącza.

The results of the investigation of the influence of temperature on the strength of aluminium-copper bonds obtained by the technology of cold metal forming have been described. Bar sections have been joined by the method of upsetting their ends. The samples were annealed at 300, 400, 530, 540 and 570°C with various heating times and various ways of cooling. Structural examinations have shown that a zone of hard and brittle intermetallic compounds, CuAl, CuAl2, CuAl2O4, Cu9Al4, forms in the bond, beginning from the temperature of 400°C. The compounds are arranged in layers adhering to each other with the total thickness of 30 to 100 mm. All the bonds containing intermetallic compounds broke in bending test at a force several times lower than the one necessary to bend the given sample in not annealed condition. It has been found that the higher was the temperature of the bond heating, the lower is the value of the breaking force.