Behaviour of foam concrete under sulphate environments

Ranjani, G. Indu Siva; Ramamurthy, K.

doi:10.1016/j.cemconcomp.2012.03.007

Cited by 57 publications

(27 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Concrete degradation by sulfate attack mechanisms depends on several factors, such as cement type, presence of mineral additions, water/cement ratio, cation type associated with sulfate anions, sulfate concentration, time and duration of exposure, environment, hydration degree, and curing conditions (Hossain and Lachemi, 2006;Prasad et al, 2006;Indu Siva Ranjani and Ramamurthy, 2012), in addition to other parameters, such as pore structure, permeability, diffusivity and mechanical properties (Prasad et al, 2006). In concretes made with PC, the degree of sulfate attack depends on the availability of Ca(OH)2 and C3A (Hossain and Lachemi, 2006); therefore, the chemical composition of the cement has an important role in its resistance to sulfate (Prasad et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

Resistance to compression and microstructure of concrete manufactured with supersulfated cements-based materials of volcanic origin exposed to a sulphate environment

Maldonado-Bandala

Luna²,

Escalante-Garcı́a

et al. 2018

Revista de la Asociación Latinoamericana de Control de Calidad,

View full text Add to dashboard Cite

This research presents the results of concretes made with supersulfated cements (SSC) volcanic material bases. The concretes were cured under two regimes one for 24 h at 25 ° C and one for 22 h at 60 ° C and then at 25 ° C. The specimens were exposed to two conditions, dry under laboratory conditions and immersed in a solution with 3.5% CaSO 4 at 25 ° C for up to 180 days. After 180 days, the concrete with a 5% An-10% PC-10% CaO-75% PM cementant exposed to the CaSO4 solution achieved a compressive strength of 46 MPa and 44 MPa dry under conditions of laboratory. The microstructure was analyzed by scanning electron microscopy, energy dispersive spectroscopy and XRD, showing that the main hydration products are C-S-H and ettringite.

show abstract

Section: Discussionmentioning

confidence: 99%

Resistance to compression and microstructure of concrete manufactured with supersulfated cements-based materials of volcanic origin exposed to a sulphate environment

Maldonado-Bandala

Luna²,

Escalante-Garcı́a

et al. 2018

Revista de la Asociación Latinoamericana de Control de Calidad,

View full text Add to dashboard Cite

show abstract

“…There are many reports on the damage process of concrete exposed to single sulfate attack through the sulfate immersion tests [1][2][3][4][5]. Nevertheless, there has often been the different performance of concrete in immersion test from that observed in a field exposure.…”

Section: Introductionmentioning

confidence: 99%

Deterioration of mortars exposed to sulfate attack under electrical field

Huang

Chong

Zeng

et al. 2016

Construction and Building Materials

View full text Add to dashboard Cite

The damage process of plain and blended cement mortars subjected to sulfate attack under electrical field was investigated in this paper. The deterioration of mortars was investigated by measuring the loss of compressive strength. To identify the changes of microstructure and mineral phases after the test, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction analysis were performed on the selected samples. The results indicated that compared with sulfate attack alone, the combination of sulfate attack and electrical field accelerated the damage process of mortars, which can be explained through two different mechanisms. On the one hand, Ca 2+ ions directionally moved and then leached out from mortars under the electrical field, leading to the dissolution of portlandite as well as the decomposition of C-S-H gel at the later stage. On the other hand, the electrical field accelerated the migration of sulfate ions and then they reacted with hydration products to form massive ettringite and gypsum, which resulted in the microcracks and strength loss of mortars. Moreover, the deterioration of the mortar blended with fly ash was still visible in spite of its better chemical resistance. The strength loss of limestone powder incorporated mortar increased in comparison with Portland cement mortar as a result of an increase in porosity.

show abstract

“…The construction of high-rise and super high-rise buildings impels the need to reduce the weight of walls; foamed concrete has become one of the hotspots in research of building materials because of the national policy that advocates energy efficiency of buildings [1][2][3][4][5][6]. Glazed hollow beads (GHBs), a new inorganic thermal insulator, are characterized by spherical hollow structure, closed air voids, vitrified surface, stable physical and chemical properties, low density, low thermal conductivity, and good fluidity [7,8].…”

Section: Introductionmentioning

confidence: 99%

Research on Properties of Foamed Concrete Reinforced with Small Sized Glazed Hollow Beads

Liu

et al. 2016

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Foamed concrete (400 kg/m3) was prepared through a physical foaming method using ordinary Portland cement (42.5R), vegetable protein foaming agent, fly ash, and glazed hollow beads (GHB, K46) as raw materials. The performance of cement paste as well as the structure and distribution of air voids was characterized by rheometry, SEM, and XRD analyses with imaging software. The effects of GHBs on the compressive strength and thermal conductivity of the foamed concrete sample were also explored. Results show that the proportion of 50–400 μm air voids, average air-void diameter, 28 d compressive strength, and thermal conductivity of the test sample mixed with 2.4 wt% GHBs are 94.44%, 182.10 μm, 2.39 MPa, and 0.0936 w/(m·k), respectively. Excessive amount of GHBs (>2.4 wt%) increases the amount of air voids with diameter smaller than 50 μm in the hardened foamed concrete as well as the degree of open porosity. Moreover, the proportion of 50–400 μm air voids, average air-void diameter, 28 d compressive strength, and thermal conductivity of the sample mixed with 4.0 wt% GHBs are 88.54%, 140.50 μm, 2.05 MPa, and 0.0907 w/(m·k), respectively.

show abstract

Behaviour of foam concrete under sulphate environments

Cited by 57 publications

References 17 publications

Resistance to compression and microstructure of concrete manufactured with supersulfated cements-based materials of volcanic origin exposed to a sulphate environment

Resistance to compression and microstructure of concrete manufactured with supersulfated cements-based materials of volcanic origin exposed to a sulphate environment

Deterioration of mortars exposed to sulfate attack under electrical field

Research on Properties of Foamed Concrete Reinforced with Small Sized Glazed Hollow Beads

Contact Info

Product

Resources

About