scholarly journals Pore structure description of mortars containing ground granulated blast-furnace slag by mercury intrusion porosimetry and dynamic vapour sorption

2017 ◽  
Vol 145 ◽  
pp. 157-165 ◽  
Author(s):  
Natalia Alderete ◽  
Yury Villagrán ◽  
Arn Mignon ◽  
Didier Snoeck ◽  
Nele De Belie
Keyword(s):  
Blast Furnace ◽  
Pore Structure ◽  
Blast Furnace Slag ◽  
Mercury Intrusion Porosimetry ◽  
Mercury Intrusion ◽  
Vapour Sorption ◽  
Granulated Blast Furnace Slag ◽  
Dynamic Vapour Sorption ◽  
Structure Description ◽  
Furnace Slag

Relation Between Strength, Pore Structure and Associated Properties of Slag-Containing Cementitious Materials

1984 ◽  
Vol 42 ◽  
Author(s):  
Della M. Roy ◽  
G. M. Idorn
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Pore Structure ◽  
Cement Paste ◽  
Blast Furnace Slag ◽  
Cementitious Materials ◽  
Granulated Blast Furnace Slag ◽  
Pore Structures ◽  
Furnace Slag

AbstractSubstantial increases of the strength of cement paste and mortars may be obtained in conventional processing by optimizing the materials components, the rheology and the curing, and thereby improving the microstructures. Cementitious materials with high proportions of granulated blast-furnace slag have been investigated. Higher strengths of ASTM C 109 mortars were obtained with 40 to 65% substitution of portland cement by slag, than with ordinary mix compositions and processing.For one set of mixtures, 28 day strengths ≥ 100 MPa (some as high as 240 MPa) were consistently attained after curing at temperatures ranging from 27 to 250°C. The slag substitutions developed finer pore structures as revealed by intrusion porosimetry measurements, than those with pure portland cement. This is believed to be a major reason for their enhanced durability. At each stage from 3 to 28 days, increase of curing temperatures from 27 to 90°C decreased porosity and increased the strength, reflecting an increased maturity.Implications for practice and suggestions for further work are discussed.

Cement-Free Mortar Using Ground Granulated Blast-Furnace Slag with Different Alkali-Activators

2014 ◽  
Vol 578-579 ◽  
pp. 1430-1440 ◽  
Author(s):  
Joon Woo Park ◽  
Sung In Hong ◽  
Hee Jun Yang ◽  
Thamara Tofeti Lima ◽  
Ki Yong Ann
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Pore Structure ◽  
Blast Furnace Slag ◽  
Chloride Transport ◽  
Setting Time ◽  
Total Pore Volume ◽  
Granulated Blast Furnace Slag ◽  
Hydroxyl Ion ◽  
Furnace Slag

The present study concerns a development of cement-free concrete using ground granulated blast-furnace slag (GGBS) with alkali-activators such as KOH, NaOH, and Ca (OH)2. To find out the development among three different activators, the concentration of hydroxyl ion was kept 0.5%, 1.0%, 1.5%, 2.0% and 3.0% by weight of binder irrespective of cations. The setting time was measured by penetration resistance immediately after casting of mortar. The development of compressive strength was measured at 7, 14, 28, and 91 days. The pore structure of cement-free mortar was examined by the mercury intrusion porosimetry (MIP) and rapid chloride penetration test (RCPT). Simultaneously, grew sample was used to microscopically observe at the XRD. For strength of cement-free mortar, mixed with KOH or NaOH was as high as OPC at 3.0 % by weight of binder. However, the compressive strength of cement-free concrete mixed with 3.0 % Ca (OH)2 by weight of binder had just half strength of OPC mortar. Cement-free concrete activated with NaOH and Ca (OH)2 had higher total pore volume, however, it had lower ionic penetrability due to the pore type which mostly consist of gel pores. For pore structure of cement-free mortar mixed with KOH, the total volume had similarity to that of OPC mortar, however, it had lower penetrability. Therefore, it may have higher resistance to chloride transport than that of OPC mortar.

scholarly journals Influences of Ultrafine Slag Slurry Prepared by Wet Ball Milling on the Properties of Concrete

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Yubo Li ◽  
Shaobin Dai ◽  
Xingyang He ◽  
Ying Su
Keyword(s):  
Environmental Sustainability ◽  
Blast Furnace Slag ◽  
Ball Mill ◽  
High Performance ◽  
Mercury Intrusion Porosimetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mercury Intrusion ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

The application of ultrafine ground-granulated blast-furnace slag (GGBFS) in concrete becomes widely used for high performance and environmental sustainability. The form of ultrafine slag (UFS) used in concrete is powder for convenience of transport and store. Drying-grinding-drying processes are needed before the application for wet emission. This paper aims at exploring the performances of concrete blended with GGBFS in form of slurry. The ultrafine slag slurry (UFSS) was obtained by the process of grinding the original slag in a wet ball mill, which was mixed in concrete directly. The durations of grinding were 20 min, 40 min, and 60 min which were used to replace Portland cement with different percentages, namely, 20, 35, and 50, and were designed to compare cement with original slag concrete. The workability was investigated in terms of fluidity. Microstructure and pore structure were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). The fluidity of concrete mixed with UFSS is deteriorated slightly. The microstructure and early strength were obviously improved with the grind duration extended.

Effect of Ground Phosphate Slag on the Resistance to Chloride Ion Penetration of Concrete

2011 ◽  
Vol 194-196 ◽  
pp. 924-929
Author(s):  
Jian Xiong Ye ◽  
Ye Jiang Wang ◽  
Shuang Zhao ◽  
Ming Chao Yang ◽  
Chang Hui Yang
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Pore Structure ◽  
Blast Furnace Slag ◽  
Chloride Ion ◽  
Granulated Blast Furnace Slag ◽  
Chloride Ion Penetration ◽  
Phosphate Slag ◽  
Furnace Slag ◽  
Ion Penetration

The permeability resistance of concrete with ground phosphate slag(GPS) against chloride ion penetration was tested according to ASTM1202 and by nitrogen adsorption method. Test results show that by adding ground phosphate slag to concrete, the chloride diffusion coefficient of concrete decreases, and the permeability resistance of concrete against chloride ion penetration increases with improvement of its pore structure. The pores in concrete are refined and the percentage of the pores with diameter less than 20nm in concrete increases. The improvement of pore structure of the concrete by ground phosphate slag is much better than that by the ground granulated blast furnace slag or fly ash, while the addition is 30 percent. The ability of additive to improve the permeability resistance of concrete against chloride ion penetration is in following order: fly ash > ground phosphate slag > ground granulated blast furnace slag.

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