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Journal articles on the topic 'Nontraditional and Natural Pozzolans'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Tokpatayeva, R., A. Castillo, J. Yoon, G. Kaladharan, K. Jafari, R. M. Arachchige, F. Rajabipour, S. Peethamparan, and J. Olek. "Comparative Study of the Reactivity and Performance of Different Nontraditional and Natural Pozzolans in Cementitious System." Advances in Civil Engineering Materials 11, no. 2 (October 5, 2022): 20220021. http://dx.doi.org/10.1520/acem20220021.

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2

Sierra, Oscar M., Jordi Payá, José Monzó, María V. Borrachero, Lourdes Soriano, and Javier Quiñonez. "Characterization and Reactivity of Natural Pozzolans from Guatemala." Applied Sciences 12, no. 21 (November 3, 2022): 11145. http://dx.doi.org/10.3390/app122111145.

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The possibility of using pozzolanic materials as a partial substitute for Portland cement (PC) to develop mortars and concretes promotes environmental and economic benefits. The present paper includes an in-depth investigation into the characterization of natural pozzolans from Guatemala for the valorization of these materials. An exhaustive physico-chemical characterization of the starting materials was first carried out. Second, an analysis of the pozzolanic reactivity of both pozzolans was performed using an evolution test of the pH and electrical conductivity measurements and a Frattini test. Finally, pastes and mortars were manufactured with pozzolans T and R as a substitute for PC. The results of the pH and electrical conductivity measurements confirmed that natural pozzolans can be classified as low-reactivity. The Frattini test and the thermogravimetric analysis confirmed the pozzolanic behavior of natural pozzolans at 28 curing days. In the cement pastes, lime fixation was positive for a long curing period, which demonstrated that these pozzolans had medium–long-term pozzolanic activity, similar to fly ash (FA). The results were confirmed by mechanical assays. The mortars with 15%, 25%, and 35% substitutions of cement for pozzolans had strength gain percentages of around 13–15% at 90 curing days.

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3

Shi, Caijun. "An overview on the activation of reactivity of natural pozzolans." Canadian Journal of Civil Engineering 28, no. 5 (October 1, 2001): 778–86. http://dx.doi.org/10.1139/l01-041.

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Natural pozzolan is one of the oldest construction materials. Lime-pozzolan cements have been used for several thousands of years and have an excellent reputation for their durability. Pozzolans are being widely used as a cement replacement in Portland cement concrete. The use of pozzolans has the advantage of lower costs and better durability, but the disadvantage of a longer setting time and a slower early strength development. Different techniques have been tried to increase the reactivity of natural pozzolans to overcome these disadvantages. This paper has reviewed various methods used to activate the pozzolanic activity of natural pozzolans. All activation methods can be classified into three catalogues: thermal, mechanical, and chemical activation. A comparison based on strengthcost relationship indicates that the chemical activation method is the most effective and cheapest one.Key words: activation, reactivity, natural pozzolans, pozzolanic reaction, calcination, elevated temperature curing, chemical activators, strength, cost.

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4

Pourkhorshidi, A. R., J. Sobhani, and A. A. Ramezanianpour. "A geochemical assessment method for identification of natural pozzolans as supplementary cementitious material." Advances in Cement Research 33, no. 12 (December 2021): 550–60. http://dx.doi.org/10.1680/jadcr.21.00078.

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Pozzolans are available in natural resources as raw materials that are potentially applicable in the cement and concrete industries. Proper identification and exploration methods are crucial in relation to their technical and economical purposes. In this paper, a two-phase study is employed, based on geochemical data processing and experimental investigations. Chemical and petrography of natural pozzolans were utilised to develop the proposed method. This method proposes three geochemical indexes: the limiting values of silica/calcium oxide (SiO2/CaO), alumina saturation and alkali content to qualify the natural pozzolan according to the supplementary cementitious requirements. Then, based on ASTM C618 and EN 196-5 standards and complementary tests, the chemical and physical properties of two natural pozzolans were assessed to validate the proposed method. The results showed that this method could be used as a robust and direct way to identify natural pozzolans.

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5

Elmahdoubi, Fadoua, Safaa Mabroum, Rachid Hakkou, and Mounsif Ibnoussina. "Geopolymer Materials Based on Natural Pozzolans from the Moroccan Middle Atlas." Minerals 11, no. 12 (November 30, 2021): 1344. http://dx.doi.org/10.3390/min11121344.

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The pozzolans of the Moroccan Middle Atlas are derived from a low explosive volcanism, mostly strombolian. They are mainly composed of olivine and pyroxene, presenting a less homogeneous structure (irregular vesicles). The main target of this project is to study the use of natural pozzolans (NP) and metakaolin as precursors for the production of geopolymeric binders. The characterization of raw materials and elaborated geopolymers was carried out to study their mineralogical, chemical, microstructural, and mechanical properties. The studied pozzolans and kaolin were crushed, grinded, and sifted to get a fine grain size diameter of less than 100 µm. Then, they were calcined at 750 °C for 2 h to achieve an amorphous structure, increasing of their reactivity. Geopolymer production consists of mixing pozzolans and metakaolin with different amounts with an alkaline solution of sodium hydroxide and sodium silicates. The mass proportion of metakaolin (MK) used in this study was 10%, 20%, and 30%. In the present work, the amount of metakaolin was added as a source of alumina. The elaborated geopolymers were characterized using XRD, FTIR, TGA, and SEM analyses. The compressive strength was measured at 7, 14, and 28 days. The results showed interesting mechanical proprieties at about 18 MPa at 28 days with the mixture containing 20% MK. The addition of MK showed a significant increase in mechanical properties of the elaborated geopolymer. Meanwhile, the other results confirmed the training of new phases in addition to N-A-S-H gel. All these results indicate that the use of pozzolans in the production of geopolymers could be a great solution for the sustainable management of this mineral resource.

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6

Shukla, Ashish, Nakul Gupta, Ankur Gupta, Rajesh Goel, and Sanjeev Kumar. "Natural Pozzolans a Comparative Study: A Review." IOP Conference Series: Materials Science and Engineering 804 (June 17, 2020): 012040. http://dx.doi.org/10.1088/1757-899x/804/1/012040.

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7

Santana, Juan J., Natalia Rodríguez-Brito, Concepción Blanco-Peñalver, Vicente F. Mena, and Ricardo M. Souto. "Durability of Reinforced Concrete with Additions of Natural Pozzolans of Volcanic Origin." Materials 15, no. 23 (November 24, 2022): 8352. http://dx.doi.org/10.3390/ma15238352.

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In this work, the properties of concrete modified with dosages of natural pozzolans (NP) in substitution of cement or superfine aggregates were evaluated. Proportions of 20/80 pozzolan/cement or pozzolan/superfine aggregates were selected for the additions of quarry and tuff pozzolans. Pozzolanic activity, durability, compressive strength, characteristic resistance, settling consistency, density, electrical resistivity, depth of water penetration, accessible porosity, and carbonation and chloride penetration were determined for the resulting concrete mixtures, and they were subsequently compared to the values obtained for the reference concrete batches without additions. The results of the cementitious mixtures supplemented with tuff (PZT) and quarry (PZQ) pozzolans, expressed in mmol/L, are consistent with the pozzolanism test, with [Ca(OH)2]/[OH−] ratios at 7 days are 6.03/60.19 for PZQ and 1.78/92.78 PZT. In addition to the pozzolanic activity at these dosages, the characteristic resistance and durability parameters required by EHE-08 were verified. Particular attention was given to the determination of the diffusion of chloride ions, introducing an instrumental modification of the accelerated integral method. The modification provides values of diffusion coefficients similar to those obtained by the other methods with the advantage of greater stability and quality of the measurement.

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8

Espinoza-Hijazin, Gaston, Álvaro Paul, and Mauricio Lopez. "Concrete Containing Natural Pozzolans: New Challenges for Internal Curing." Journal of Materials in Civil Engineering 24, no. 8 (August 2012): 981–88. http://dx.doi.org/10.1061/(asce)mt.1943-5533.0000421.

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9

Bahadori, Hadi, Araz Hasheminezhad, and Farshad Taghizadeh. "Experimental Study on Marl Soil Stabilization Using Natural Pozzolans." Journal of Materials in Civil Engineering 31, no. 2 (February 2019): 04018363. http://dx.doi.org/10.1061/(asce)mt.1943-5533.0002577.

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10

Hooton, RD, GS Barger, ER Hansen, MR Wood, T. Neary, DJ Beech, and D. Jaquier. "Production and Use of Calcined Natural Pozzolans in Concrete." Cement, Concrete and Aggregates 23, no. 2 (2001): 73. http://dx.doi.org/10.1520/cca10478j.

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11

Rodrı́guez-Camacho, R. E., and R. Uribe-Afif. "Importance of using the natural pozzolans on concrete durability." Cement and Concrete Research 32, no. 12 (December 2002): 1851–58. http://dx.doi.org/10.1016/s0008-8846(01)00714-1.

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12

Shakiba, Mohammad, Peyman Rahgozar, Amir Reza Elahi, and Reza Rahgozar. "Effect of Activated Pozzolan with Ca(OH) 2 and nano-SiO2 on Microstructure and Hydration of High-Volume Natural Pozzolan Paste." Civil Engineering Journal 4, no. 10 (October 30, 2018): 2437. http://dx.doi.org/10.28991/cej-03091171.

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The main aim of this study is to investigate the effect of activated pozzolan on hydration and microstructure of high-volume natural pozzolan paste. Thermal activation of natural pozzolan with Ca(OH)2 has been applied with nano-silica (NS) as activator at three different temperatures. X-ray diffraction (XRD), thermogravimetric analysis (TGA), laser particle analysis, scanning electron microscopy (SEM) with energy dispersive spectroscopy were employed. In order to analyze the test results, notions of “pre C-S-H” based on XRD and TGA results of activated pozzolan powders has been used. SEM images indicated microstructural improvements of the pastes with activated pozzolans compared to paste with natural pozzolan and natural pozzolan incorporating NS, showing the pore-filling effect of activated pozzolans. The microstructural improvements were proportion to the amount of pre C-S-H formed during the activation of pozzolan.

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13

Hefni, Mohammed, and Maaz A. Ali. "The Potential to Replace Cement with Nano-Calcium Carbonate and Natural Pozzolans in Cemented Mine Backfill." Advances in Civil Engineering 2021 (March 6, 2021): 1–10. http://dx.doi.org/10.1155/2021/5574761.

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The effectiveness of mine backfilling depends on the properties of its constituents. The high cost of cement, which is commonly used as a binder in mine backfill, has led researchers to seek alternatives to partially replace it with other binders. This study investigated the potential to use nano-calcium carbonate (NCC) and natural pozzolans (zeolite and pumice) along with Portland cement (PC) in mine backfill. Two types of experimental samples were prepared: (1) gold tailings and silica sand to investigate the effect of NCC and (2) nickel tailings to investigate the effect of natural pozzolans. The unconfined compressive strength (UCS) was measured for samples cured for up to 56 days. Moreover, selected samples were subject to mercury intrusion porosimetry to investigate microstructural properties. Results show that addition of NCC did not improve the UCS of backfill prepared with gold tailings and cured for 28 days, whereas a dosage of 1% NCC in backfill samples prepared with silica sand improved UCS by 20%, suggesting that the gold tailings negatively affected strength development. Natural pozzolans, in particular, 20% zeolite, had 24% higher UCS after 56 days of curing compared to samples prepared with PC and thus have the potential to partially replace cement in mine backfill.

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14

Juimo Tchamdjou, Willy Hermann, Sophie Grigoletto, Frédéric Michel, Luc Courard, Toufik Cherradi, and Moulay Larbi Abidi. "Effects of Various Amounts of Natural Pozzolans from Volcanic Scoria on Performance of Portland Cement Mortars." International Journal of Engineering Research in Africa 32 (September 2017): 36–52. http://dx.doi.org/10.4028/www.scientific.net/jera.32.36.

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The aim of this paper is to assess the possibility of using natural pozzolans (NPs) from Cameroonian volcanic scoria as supplementary cementitious materials (SCMs) in the production of Portland cement mortars. Four natural pozzolans (Black Natural Pozzolan: BNP, Dark-Red Natural Pozzolan: DRNP, Red Natural Pozzolan: RNP and Yellow Natural Pozzolan: YNP) with 3600, 4500, 4700 and 5200 cm2/g Blaine fineness respectively were produced from different colors (Black, Dark red, Red and Yellow) volcanic scoria in a laboratory mill. Natural pozzolans were characterized with regard to particle size distribution, particle shape, electrical conductivity, X-ray fluorescence (XRF) and X-ray diffraction (XRD). The calcium hydroxide consumption by NPs was assessed firstly by electrical conductivity measurements of calcium hydroxide/NPs suspensions with calcium hydroxide excess. Evidence of pozzolanic reactivity of NPs is revealed in hydrated lime pastes, and low reactivity was observed in aqueous suspensions. The effects of 15, 25, and 35 wt.% of NPs as cement substitution on the properties of Portland cement mortars were investigated. Different properties were studied such as setting time, consistency, mechanical strength, pozzolanic activity, absorption by capillarity and resistance to carbonation. The reactivity of NPs was also assessed by means of the mechanical strength development of mortars. The results obtained show that pozzolanic and hydraulic reactions take place in OPC systems. The correlation between mechanical strengths and physical properties of NPs has been established. The study concludes that using DRNP and RNP at 15 wt. % cement replacement can ameliorate globally the performance of mortar. Using all NPs at 35 wt. % has negative effect on the fundamental properties of cementitious mortars.

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15

Cobîrzan, Nicoleta, Anca-Andreea Balog, and Emilia Moşonyi. "Investigation of the Natural Pozzolans for Usage in Cement Industry." Procedia Technology 19 (2015): 506–11. http://dx.doi.org/10.1016/j.protcy.2015.02.072.

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16

Bahadori, Hadi, Araz Hasheminezhad, and Sakineh Alizadeh. "The Influence of Natural Pozzolans Structure on Marl Soil Stabilization." Transportation Infrastructure Geotechnology 7, no. 1 (August 7, 2019): 46–54. http://dx.doi.org/10.1007/s40515-019-00089-4.

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17

owsiak, Zdzisława, Przemysław Czapik, and Justyna Zapała-Sławeta. "METHODS OF MITIGATING ALKALI REACTIVITY OF GRAVEL AGGREGATE." Structure and Environment 14, no. 3 (September 30, 2022): 102–9. http://dx.doi.org/10.30540/sae-2022-013.

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Effectiveness of selected chemical admixtures and mineral additives to mitigate alkali-silica reaction was compared based on reactive gravel aggregate. Lithium compounds in the form of nitrate and lithium polysilicate were used as chemical admixtures. Natural pozzolans containing zeolite were used as mineral additive. Efficiency of the additive was enhanced by modification with ammonium ions. Linear changes of mortars with crushed gravel aggregates were studied with the accelerated and long-term methods. Additionally, scanning electron microscopy was used for microstructural observations. It was demonstrated that at elevated temperatures the application of lithium compounds provided better protection. Under conditions similar to those in the field, 20-30% of natural pozzolans proved to be more effective in inhibiting the expansion. Regardless of the method of protection applied, the presence of alkali-silica reaction products was detected in the microstructure of the mortars.

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18

Pontes, Jorge, António Santos Silva, and Paulina Faria. "Evaluation of Pozzolanic Reactivity of Artificial Pozzolans." Materials Science Forum 730-732 (November 2012): 433–38. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.433.

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Pozzolanicity is a very interesting issue regarding building materials, as a way to enhance mortars and concrete durability. This property results from the reaction between calcium hydroxide and silica and alumina based materials. Different types of natural and artificial pozzolans show pozzolanic activities that differ depending on the materials characteristics. Therefore, the study of this property, namely its reactivity with calcium hydroxide, reveals itself to be important in the selection of the type and content of these materials. This paper presents the results of several pozzolanic reactivity methods, applied to different pozzolanic materials. The selected pozzolanic methods include Chapelle method, Fratinni method and Strength Activity Index. Those tests have been applied to evaluate the reactivity of various kinds of artificial pozzolans. The correlation between the test methods are presented and discussed.

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19

Dabbaghi, Farshad, Aref Sadeghi-Nik, Nicolas Ali Libre, and Sepideh Nasrollahpour. "Characterizing fiber reinforced concrete incorporating zeolite and metakaolin as natural pozzolans." Structures 34 (December 2021): 2617–27. http://dx.doi.org/10.1016/j.istruc.2021.09.025.

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20

Shi, Caijun, and Robert L. Day. "Chemical activation of blended cements made with lime and natural pozzolans." Cement and Concrete Research 23, no. 6 (November 1993): 1389–96. http://dx.doi.org/10.1016/0008-8846(93)90076-l.

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21

Firdous, Rafia, and Dietmar Stephan. "Effect of silica modulus on the geopolymerization activity of natural pozzolans." Construction and Building Materials 219 (September 2019): 31–43. http://dx.doi.org/10.1016/j.conbuildmat.2019.05.161.

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22

Uzal, B., and L. Turanli. "Studies on blended cements containing a high volume of natural pozzolans." Cement and Concrete Research 33, no. 11 (November 2003): 1777–81. http://dx.doi.org/10.1016/s0008-8846(03)00173-x.

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23

Pavlidou, E. "Systematic analysis of natural pozzolans from Greece suitable for repair mortars." Journal of Thermal Analysis and Calorimetry 108, no. 2 (November 20, 2011): 671–75. http://dx.doi.org/10.1007/s10973-011-2039-y.

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24

Arum, R. C., C. Arum, and S. A. Alabi. "The highs and lows of incorporating pozzolans into concrete and mortar: A review on strength and durability." Nigerian Journal of Technology 41, no. 2 (June 2, 2022): 197–211. http://dx.doi.org/10.4314/njt.v41i2.1.

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It has been established that the construction industry, especially with regards to the production and use of cement generates lots of toxic gases, as well as consumes large quantities of natural resources. Cement itself is an expensive constituent of concrete. In order to reduce environmental pollution, improve cost-savings in production, achieve carbon neutrality and sustainability, the focus should be directed at using alternative waste materials such as ceramic waste, waste glass, palm oil waste, and rice husk, among others. This paper presents a widescale review of the incorporation of pozzolans into concrete and mortar, highlighting the effects on its strength and durability. The review revealed that while the existing literature agrees that the incorporation of pozzolans into mortar and concrete generally improves their durability, there is an apparent contradiction in various research findings on the effect of pozzolans on their strength. The review has shown however that whether the inclusion of pozzolan will increase or decrease strength depends on a number of factors such as Portland cement replacement level, fineness of the pozzolan (particle size of the ash), the reactivity of the pozzolan, concrete/mortar age, type of pozzolan, water-cement ratio, burning temperature, the microstructure of the pozzolan (weakly or strongly amorphous).

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25

Bondar, Dali, C. J. Lynsdale, and N. B. Milestone. "Simplified Model for Prediction of Compressive Strength of Alkali-Activated Natural Pozzolans." Journal of Materials in Civil Engineering 24, no. 4 (April 2012): 391–400. http://dx.doi.org/10.1061/(asce)mt.1943-5533.0000400.

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26

Bustos, Fernando, Patricia Martinez, Carlos Videla, and Mauricio Lopez. "REDUCING CONCRETE PERMEABILITY BY USING NATURAL POZZOLANS AND REDUCED AGGREGATE-TO-PASTERATIO." Journal of Civil Engineering and Management 21, no. 2 (January 30, 2015): 165–76. http://dx.doi.org/10.3846/13923730.2013.802719.

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Improved durability of concrete is mainly achieved with low-permeability. Permeability depends on permeability of the bulk cement paste (CP) and that of its interfacial transition zone (ITZ). Even though permeability of CP is well understood and can be adequately controlled, permeability of ITZ is not well understood yet. This paper shows that minimizing permeability of concrete requires minimizing permeability of CP by using a supplementary cementing material (SCM) such as natural pozzolans (NP) and minimizing ITZ by reducing aggregate content until maximum cement content. This was done by comparing performance of concrete made with ordinary Portland cement (OPC) and blended cement (OPC+NP) at the same w/b, and by comparing performance of concrete with different amount of ITZ at the same w/b. All of this was performed through testing of mechanical properties, air permeability, sorptivity, chloride ion diffusion, and aggregate specific surface. Results show that NP reduced air permeability by 84% and chloride ion diffusion by 66%, but increased sorptivity up to 140%. ITZ has an important effect in all properties; especially in air permeability where sensitive reduction of more than a 90% was achieved. ITZ effect seems to be as important as using SCMs in improving durability of concrete.

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27

Moropoulou, Antonia, Asterios Bakolas, and Eleni Aggelakopoulou. "Evaluation of pozzolanic activity of natural and artificial pozzolans by thermal analysis." Thermochimica Acta 420, no. 1-2 (October 2004): 135–40. http://dx.doi.org/10.1016/j.tca.2003.11.059.

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28

Rahhal, V., and R. Talero. "Fast physics-chemical and calorimetric characterization of natural pozzolans and other aspects." Journal of Thermal Analysis and Calorimetry 99, no. 2 (June 10, 2009): 479–86. http://dx.doi.org/10.1007/s10973-009-0016-5.

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29

Bondar, Dali, C. J. Lynsdale, N. B. Milestone, N. Hassani, and A. A. Ramezanianpour. "Effect of heat treatment on reactivity-strength of alkali-activated natural pozzolans." Construction and Building Materials 25, no. 10 (October 2011): 4065–71. http://dx.doi.org/10.1016/j.conbuildmat.2011.04.044.

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30

M.Mane, Kiran, S. P. Chavan, S. A. Salokhe, P. A. Nadgouda, and S. T. Patil. "Predicting Slump Values of Concrete Made by Pozzolans and Manufactured Sand using ANN." International Journal of Recent Technology and Engineering (IJRTE) 10, no. 5 (January 30, 2022): 66–72. http://dx.doi.org/10.35940/ijrte.d6616.0110522.

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Large amounts of natural fine aggregate (NFA) and cement are used in building, which has major environmental consequences. This view of industrial waste can be used in part as an alternative to cement and part of the sand produced by the crusher as fine aggregate, similar to slag sand (GGBFS), fly ash, metacaolin, and silica fume. Many times, there are issues with the fresh characteristics of concrete when using alternative materials. The ANN tool is used in this paper to develop a Matlab software model that collapses concrete made with pozzolanic material and partially replaces natural fine aggregate (NFA) with manufactured sand (MS). Predict. The slump test was carried out in reference with I.S11991959, and the findings were used to create the artificial neural network (ANN) model. To mimic the formation, a total of 131 outcome values are employed, with 20% being used for model testing and 80% being used for model training. 25 enter the material properties to determine the concrete slump achieved by partially substituting pozzolan for cement and artificial sand (MS) for natural fine aggregate (NFA). According to studies, the workability of concrete is critically harmed as the amount of artificial sand replacing natural sand grows. The ANN model's results are extremely accurate, and they can forecast the slump of concrete prepared by partly substituting natural fine aggregate (NFA) and artificial sand (MS) with pozzolan.

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31

Montanheiro, T. "Serra Geral Formation—São Paulo State, Brazil: a potential source for natural pozzolans." Materials Letters 58, no. 6 (February 2004): 876–81. http://dx.doi.org/10.1016/j.matlet.2003.06.015.

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32

Değirmenci, F. Nurhayat. "Utilization of Natural and Waste Pozzolans as an Alternative Resource of Geopolymer Mortar." International Journal of Civil Engineering 16, no. 2 (November 1, 2016): 179–88. http://dx.doi.org/10.1007/s40999-016-0115-1.

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33

Habert, G., N. Choupay, J. M. Montel, D. Guillaume, and G. Escadeillas. "Effects of the secondary minerals of the natural pozzolans on their pozzolanic activity." Cement and Concrete Research 38, no. 7 (July 2008): 963–75. http://dx.doi.org/10.1016/j.cemconres.2008.02.005.

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34

Cheng, Yongzhen, Shuang Wang, Jun Li, Xiaoming Huang, Chang Li, and Jingke Wu. "Engineering and mineralogical properties of stabilized expansive soil compositing lime and natural pozzolans." Construction and Building Materials 187 (October 2018): 1031–38. http://dx.doi.org/10.1016/j.conbuildmat.2018.08.061.

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35

Hossain, K. M. A., and L. Mol. "Some engineering properties of stabilized clayey soils incorporating natural pozzolans and industrial wastes." Construction and Building Materials 25, no. 8 (August 2011): 3495–501. http://dx.doi.org/10.1016/j.conbuildmat.2011.03.042.

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36

Pourkhorshidi, A. R., M. Najimi, T. Parhizkar, F. Jafarpour, and B. Hillemeier. "Applicability of the standard specifications of ASTM C618 for evaluation of natural pozzolans." Cement and Concrete Composites 32, no. 10 (November 2010): 794–800. http://dx.doi.org/10.1016/j.cemconcomp.2010.08.007.

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37

Diaz-Loya, Ivan, Maria Juenger, Saamiya Seraj, and Rafic Minkara. "Extending supplementary cementitious material resources: Reclaimed and remediated fly ash and natural pozzolans." Cement and Concrete Composites 101 (August 2019): 44–51. http://dx.doi.org/10.1016/j.cemconcomp.2017.06.011.

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38

Oviedo, Ignacio, Mauricio Pradena, Óscar Link, and José T. Balbo. "Using Natural Pozzolans to Partially Replace Cement in Pervious Concretes: A Sustainable Alternative?" Sustainability 14, no. 21 (October 29, 2022): 14122. http://dx.doi.org/10.3390/su142114122.

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Concrete is one of the most widely used construction materials all around the globe. Associated with urban expansion, concrete pavements increase the impermeable surfaces that affect the hydrological cycle and generate urban heat islands. Cement is one of the main components of concrete, and its production is one of the main sources of worldwide CO2 emissions. Pervious concrete with partial cement replacement represents a more sustainable alternative. In this paper, the use of natural pozzolans zeolite and pumicite, as partial cement replacement materials in pervious concrete mixtures, is analyzed. The mechanical and hydraulic properties of pervious concretes using different percentages of pumicite and zeolite to replace cement (0% to 20%) were evaluated by a series of tests on compressive strength, flexural strength, permeability, porosity, and a microanalysis by SEM for the samples. Additionally, experiments with a plasticizer additive were conducted. The results show that mixtures with 0.35 W/C ratio present better mechanical and hydraulic properties; pumicite shows a better performance than zeolite, with the better properties achieved at 10% cement replacement; and the addition of plasticizer increased the final strengths. It is recommended to partially replace cement by adding 10% pumicite and to consider using 0.7% of plasticizer.

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Lima, Cristian Jonathan Franco de, Francisco Roger Carneiro Ribeiro, Geraldo Cechella Isaia, and Mauricio Mancio. "Concretes with binary mixtures of artificial pozzolans and concrete demolition waste." Ambiente Construído 20, no. 4 (December 2020): 177–88. http://dx.doi.org/10.1590/s1678-86212020000400466.

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Abstract The objective of this study is to analyse the use of binary mixtures of pozzolanic materials and concrete demolition waste in concrete mixtures, especially the resulting mechanical properties and durability. A total of ten concrete formulations were produced distinguishing them in different types using different Portland cements, different artificial pozzolans and coarse aggregates from concrete demolition. The particular properties of each formulation were verified by testing the axial compressive strength, longitudinal modulus of elasticity and penetration of chloride under immersion. Substitutions were of 15% w.t. and 30% w.t. natural coarse aggregate substituted with concrete demolition waste and, in the case of binary mixtures, additional 25% w.t. of the binder agglomerate substituted with rice husk ash or fly ash. Results showed that the final strength to axial compression and modulus of elasticity of concrete mixtures were negatively affected by utilising demolition waste, but this effect was balanced by adding supplementary cementitious materials. Regarding the durability test, it was found that the lowest coefficients occurred in the mixtures using CP V-ARI, together with artificial pozzolans, in mixtures with 15% w.t. substitution of natural aggregate with recycled aggregate. It was concluded that using recycled aggregates in concrete is viable but conditioned to the concomitant use of pozzolanic materials.

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Soldado, Eliana, Ana Antunes, Hugo Costa, Ricardo do Carmo, and Eduardo Júlio. "Influence of Pozzolan, Slag and Recycled Aggregates on the Mechanical and Durability Properties of Low Cement Concrete." Materials 14, no. 15 (July 27, 2021): 4173. http://dx.doi.org/10.3390/ma14154173.

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The sustainability of the construction sector demands the reduction of CO2 emissions. The optimization of the amount of cement in concrete can be achieved either by partially replacing it by additions or by reducing the binder content. The present work aims at optimizing the properties of concrete used in the production of reinforced concrete poles for electrical distribution lines, combining the maximization of compactness with the partial replacement of cement by fly ash, natural pozzolans, and electric furnace slags. Natural aggregates were also partially replaced by recycled ones in mixtures with fly ash. Two types of concrete were studied: a fresh molded one with a dry consistency and a formwork molded one with a plastic consistency. The following properties were characterized: mechanical properties (flexural, tensile splitting, and compressive strengths, as well as Young’s modulus) and durability properties (capillary water absorption, water penetration depth under pressure, resistance to carbonation, chloride migration, and concrete surface resistivity). The service life of structures was estimated, taking the deterioration of reinforcement induced by concrete carbonation or chloride attack into account. Results revealed that mixtures with fly ash exhibit higher mechanical performance and mixtures with fly ash or pozzolans reveal much higher durability results than the full Portland cement-based mixtures.

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Žižková, Nikol, Rostislav Drochytka, and Patrik Bayer. "The Properties of Polymer-Modified Mortars Using Pozzolana Active Admixtures." Advanced Materials Research 1129 (November 2015): 185–92. http://dx.doi.org/10.4028/www.scientific.net/amr.1129.185.

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The paper focuses on the changes in properties of cement and polymer-modified cement mortars when pozzolana-active admixture are added into the mixture. Natural and artificial pozzolans based on amorphous and mineral silicon dioxide were used. In order to explain the results obtained from the experiment and to gain new insights about the microstructure of the mixtures, equipment such as SEM sampling, RDA analysis, DTA and high-pressure mercury intrusion porosimetry were used.

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Biswas, Rahul, and Baboo Rai. "Efficiency Concepts and Models that Evaluates the Strength of Concretes Containing Different Supplementary Cementitious Materials." Civil Engineering Journal 5, no. 1 (January 27, 2019): 18. http://dx.doi.org/10.28991/cej-2019-03091222.

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The usage of Supplementary Cementitious Materials (SCM) is very much acknowledged due to the several improvements possible in the concrete composites, and because of the general economy. Research work till date suggests that utilization of SCMs enhance a significant number of the performance characteristics of the hardened concrete. The idea of efficiency can be utilized for comparing the relative performance of different pozzolans when incorporated into concrete. The efficiency concept, which was initially developed for fly ash, can be effortlessly connected to other advantageous s as well, such as silica fume, slag and natural pozzolans. A quantitative understanding of the efficiency of SCMs as a mineral admixture in concrete is essential for its effective utilization. The paper reviews the literature pertaining to the different efficiency concepts and models present to date that evaluates the strength of concretes containing different SCMs. This short survey demonstrates that there is a need for a superior comprehension of the SCMs in concrete for its powerful usage. Also, it is an effort directed towards a specific understanding of the efficiency of SCMs in concrete.

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Ghasemi, Mohsen, Haleh Rasekh, Javad Berenjian, and Hessam AzariJafari. "Dealing with workability loss challenge in SCC mixtures incorporating natural pozzolans: A study of natural zeolite and pumice." Construction and Building Materials 222 (October 2019): 424–36. http://dx.doi.org/10.1016/j.conbuildmat.2019.06.174.

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El-Desoky, Hatem M., Ahmed E. Khalil, Taher M. Shahin, and Ahmed M. Abdullah. "Natural pozzolans-like Bahariya basalts used as alternative raw materials for cement clinker Portland." Delta Journal of Science 42, no. 2 (May 1, 2021): 135–50. http://dx.doi.org/10.21608/djs.2021.170576.

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Harris, Ronald A., Thomas D. Eatmon Jr., and Christian W. A. Seifert. "Reconciling technological viability with social feasibility: the case of natural pozzolans for sustainable development." World Review of Science, Technology and Sustainable Development 5, no. 1 (2008): 49. http://dx.doi.org/10.1504/wrstsd.2008.017812.

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Zhang, Peiping, Jinqiu Huang, Zhaopu Shen, Xuelian Wang, Feng Luo, Peng Zhang, Jian Wang, and Shiding Miao. "Fired hollow clay bricks manufactured from black cotton soils and natural pozzolans in Kenya." Construction and Building Materials 141 (June 2017): 435–41. http://dx.doi.org/10.1016/j.conbuildmat.2017.03.018.

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Costafreda, Jorge Luis, and Domingo Alfonso Martín. "New Deposit of Mordenite–Clinoptilolite in the Eastern Region of Cuba: Uses as Pozzolans." Molecules 26, no. 15 (August 2, 2021): 4676. http://dx.doi.org/10.3390/molecules26154676.

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This work describes the newly discovered zeolites in the eastern region of Cuba. In the researched area, there have been no previous studies of natural zeolite exploration. Therefore, the results shown here are new. The main object of this research is to analyse five samples of zeolites and demonstrate their pozzolanic capacity and the possibility of their usage in the industrial manufacturing of pozzolanic cements. The study of the samples was performed by X-ray diffraction (XRD), X-ray fluorescence (XRF) and scanning electron microscopy (SEM). A chemical analysis (CAQ) to determine the quality of the samples as pozzolans was performed, by determining the total SiO2, reactive SiO2, total CaO, reactive CaO, Al2O3, MgO and the insoluble residue (I.R.). Lastly, an eight-day pozzolanicity analysis (PA) was carried out to determine the pozzolanic reactivity of the samples. The results obtained by XRD, XRF and SEM established that the researched zeolite samples have two main zeolitic phases: mordenite and clinoptilolite. Altered volcanic glass, quartz and smectite (montmorillonite) are the secondary phases. The results of the chemical quality analysis (CAQ) showed that the samples contain a considerable amount of reactive SiO2 and reactive CaO, as well as a low content of insoluble residue, which reinforces their properties as pozzolans. The results of the pozzolanicity analysis (PA) concluded that the analysed samples actively react with Ca(OH)2 after eight days. Based on all the results mentioned above, it is established that both mordenite and clinoptilolite behave like pozzolans and can be recommended for the manufacture of pozzolanic cements, which have more effective properties than Portland cement, in terms of physical, chemical and mechanical strength, low heat of hydration, resistance to sulphates, low CO2 emissions to the atmosphere and negligible impacts on the environment.

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Et. al., Dr Sarvesh,. "Investigative Study of Partial Replacement of Cement with Bio-Cement, Fly Ash and Natural Pozzolans." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 1S (April 11, 2021): 432–36. http://dx.doi.org/10.17762/turcomat.v12i1s.1891.

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Concrete is usually a combination of cement, coarse particles (aggregates and Sand) and water. It is used to design and improve the infrastructures.It is used to design and improve the infrastructures. Concrete has many advantages and disadvantage. The main property that is characteristic to a concrete’s workability is its compressive strength. Only through this single test, one can judge if cementing has been done appropriately. Possible advancements for development include the use of non-traditional and creative materials, and the reuse of waste materials with a specific end goal to replenish the absence of specific assets and to discover alternative ways to monitor the Earth..This investigation concentrate on Compressive strength, flexural and split tensile strength of Conventional Concrete (CC) and Class C fly ash remains with bio-cement and natural pozzolans to consider the impact of bio-concrete with blend extents of 0%,0.25%,0.5%,1% and 1.5% on quality properties. Moreover, effective self-healing usually occurred due to the use of polymers, microorganism and additional cementing material. It is the key issue to find out the self-healing efficiency’s effect to sealing the crack width successfully. And good resistance was observed during the bacterial chemical process against the freeze and thaw attacks.

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Kasaniya, Mahipal, and Michael D. A. Thomas. "Development of Blended Pozzolans Using Natural Pozzolan and Ground Glass Through Reactivity and Durability Investigations." Advances in Civil Engineering Materials 11, no. 2 (September 9, 2022): 20210154. http://dx.doi.org/10.1520/acem20210154.

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Hossain, Khandaker M. A., Mohamed Lachemi, and Mustafa Şahmaran. "Performance of cementitious building renders incorporating natural and industrial pozzolans under aggressive airborne marine salts." Cement and Concrete Composites 31, no. 6 (July 2009): 358–68. http://dx.doi.org/10.1016/j.cemconcomp.2009.03.005.

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