Comparison of corrosion resistance mechanism between ordinary Portland concrete and alkali-activated concrete subjected to biogenic sulfuric acid attack

Xie, Yudong; Lin, Xiaoyan; Ji, Tao; Liang, Yongning; Pan, Weijie

doi:10.1016/j.conbuildmat.2019.117071

Cited by 71 publications

(22 citation statements)

References 35 publications

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“…Possibility of utilization of industrial wastewater in production of safe building materials on AAC basis has also been shown [7]. Such cements are characterized by high heat-resistance [8], corrosion resistance [9] and freeze/thaw resistance [10] in comparison with those based on conventional clinker cements for general and special construction purposes.…”

Section: Introductionmentioning

confidence: 99%

Development of solutions concerning regulation of proper deformations in alkali-activated cements

Kryvenko

Gots

Petropavlovskyi

et al. 2019

EEJET

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Проаналiзовано сутнiсть проблеми власних деформацiй лужних цементiв (ЛЦ), ускладнення якої пов'язано з пiдвищеним вмiстом гелеподiбних гiдратних новоутворень. Як приклади розглянуто типи цементiв дiаметрально протилежнi за композицiйною будовою i вiдповiдно за вмiстом гелеподiбних фаз при гiдратацiї-лужний портландцемент (ЛПЦ) i шлаколужний цемент (ШЛЦ). Запропоновано пiдходи до формування ефективної структури штучного каменя, протидiючою деформацiям усадки, шляхом втручання в структуроутворення при використаннi комплексiв мiнеральних i органiчних сполук. Такi сполуки в складi комплексних органо-мiнеральних добавок сумiсно впливають на iнтенсифiкацiю кристалiзацiйних процесiв, формування ефективної порової структури та морфологiю гiдратних фаз при зменшеннi вмiсту води в штучному каменi. В якостi iнгредiєнтiв запропонованих комплексних добавок-модифiкаторiв розглянуто солi-електролiти рiзного анiонного типу та анiоноактивнi поверхнево-активнi речовини. Виявлено, що для модифiкацiї ЛПЦ найбiльш ефективною є система «сiль-електролiт-поверхнево-активна речовина». Показано, що модифiкацiя ЛПЦ комплексною добавкою цiєї системи на основi NaNO 3 забезпечує зменшення усадки з 0,406 до 0,017 мм/м. Натомiсть використання Na 2 SO 4 забезпечує цьому типу лужного цементу здатнiсть до розширення в межах 0,062 мм/м. Показано, що ефект компенсованої усадки модифiкованого ЛПЦ пов'язаний з бiльшою кристалiзацiєю низькоосновних гiдросилiкатiв (CSH(В)) i гiдроалюмiнатiв кальцiю (CaO•Al 2 O 3 •10H 2 O). Додатковий ефект пов'язаний з утворенням сульфатвмiщуючого натрiєво-кальцiєвого гiдроалюмiнату (для системи на основi Na 2 SO 4) та кристалiчного гiдронiтроалюмiнату кальцiю (для системи на основi NaNO 3) з вiдповiдним напруженням мiкроструктури. В розвиток для модифiкацiї ШЛЦ запропоновано комплексну добавку системи «портландцементний клiнкер-сiль-електролiт-поверхнево-активна речовина», яка забезпечує зменшення усадки з 0,984 мм/м до 0,683 мм/м. Мiнiмiзацiя усадки модифiкованого ШЛЦ пояснено формуванням поряд з низькоосновними гiдросилiкатами кальцiю гiдроалюмосилiкату натрiю типу гмелiнiту ((Na 2 Сa)•Al 2 •Si 4 •O 12 •6H 2 O) з пiдвищеним ступенем закристалiзованостi. При цьому вiдмiчено, що структура цементного каменя характеризується пiдвищеною щiльнiстю, однорiднiстю i монолiтнiстю гiдратних новоутворень Ключовi слова: лужний цемент, сiль-електролiт, комплексна органо-мiнеральна добавка, структуроутворення, власнi деформацiї, усадка

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Section: Introductionmentioning

confidence: 99%

Development of solutions concerning regulation of proper deformations in alkali-activated cements

Kryvenko

Gots

Petropavlovskyi

et al. 2019

EEJET

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“…Because calcium content of high-calcium fly ash is more than low-calcium fly ash, the product of gypsum increases correspondingly. The gypsum crystals block the pores of specimens [ 46 ] and compacts the microstructure of GPC, inhibiting further corrosion of sulfuric acid [ 44 ]. The gypsum crystals in high-calcium fly ash are relatively uniform and compact, and the stress generated uniformly acts on the surrounding pore walls.…”

Section: Resultsmentioning

confidence: 99%

Resistance to Sulfuric Acid Corrosion of Geopolymer Concrete Based on Different Binding Materials and Alkali Concentrations

et al. 2021

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Geopolymer binder is expected to be an optimum alternative to Portland cement due to its excellent engineering properties of high strength, acid corrosion resistance, low permeability, good chemical resistance, and excellent fire resistance. To study the sulfuric acid corrosion resistance of geopolymer concrete (GPC) with different binding materials and concentrations of sodium hydroxide solution (NaOH), metakaolin, high-calcium fly ash, and low-calcium fly ash were chosen as binding materials of GPC for the geopolymerization process. A mixture of sodium silicate solution (Na2SiO3) and NaOH solution with different concentrations (8 M and 12 M) was selected as the alkaline activator with a ratio (Na2SiO3/NaOH) of 1.5. GPC specimens were immersed in the sulfuric acid solution with the pH value of 1 for 6 days and then naturally dried for 1 day until 98 days. The macroscopic properties of GPC were characterized by visual appearance, compressive strength, mass loss, and neutralization depth. The materials were characterized by SEM, XRD, and FTIR. The results indicated that at the immersion time of 28 d, the compressive strength of two types of fly ash-based GPC increased to some extent due to the presence of gypsum, but this phenomenon was not observed in metakaolin-based GPC. After 98 d of immersion, the residual strength of fly ash based GPC was still higher, which reached more than 25 MPa, while the metakaolin-based GPC failed. Furthermore, due to the rigid 3D networks of aluminosilicate in fly ash-based GPC, the mass of all GPC decreased slightly during the immersion period, and then tended to be stable in the later period. On the contrary, in metakaolin-based GPC, the incomplete geopolymerization led to the compressive strength being too low to meet the application of practical engineering. In addition, the compressive strength of GPC activated by 12 M NaOH was higher than the GPC activated by 8 M NaOH, which is owing to the formation of gel depended on the concentration of alkali OH ion, low NaOH concentration weakened chemical reaction, and reduced compressive strength. Additionally, according to the testing results of neutralization depth, the neutralization depth of high-calcium fly ash-based GPC activated by 12 M NaOH suffered acid attack for 98 d was only 6.9 mm, which is the minimum value. Therefore, the best performance was observed in GPC prepared with high-calcium fly ash and 12 M NaOH solution, which is attributed to gypsum crystals that block the pores of the specimen and improve the microstructure of GPC, inhibiting further corrosion of sulfuric acid.

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“…Salmonella, an important foodborne pathogen, are easily attached and colonized on surfaces of concrete used in food industry due to their adherence forming biofilms [20] . The propagation and proliferation of microorganisms including bacteria (e.g., pathogens), fungi, and algae alone or together, on and/or in concrete structures, will affect concrete’s aesthetic appearance, destroy the internal structure of concrete, degrade mechanical properties and durability of concrete, increasing the cost by rehabilitation and even replacement [2] , [16] , [21] , [22] , [23] . Therefore, developing antimicrobial concrete for smart and durable infrastructures has become extremely significant and imperative.…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial concrete for smart and durable infrastructures: A review

Qiu

Dong

Ashour

et al. 2020

Construction and Building Materials

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Comparison of corrosion resistance mechanism between ordinary Portland concrete and alkali-activated concrete subjected to biogenic sulfuric acid attack

Cited by 71 publications

References 35 publications

Development of solutions concerning regulation of proper deformations in alkali-activated cements

Development of solutions concerning regulation of proper deformations in alkali-activated cements

Resistance to Sulfuric Acid Corrosion of Geopolymer Concrete Based on Different Binding Materials and Alkali Concentrations

Antimicrobial concrete for smart and durable infrastructures: A review

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