A study on the hydration rate of natural zeolite blended cement pastes

Poon, Chi Sun; Lam, L.; Kou, Shi Cong; Lin, Zong Shou

doi:10.1016/s0950-0618(99)00048-3

Cited by 220 publications

(96 citation statements)

References 10 publications

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“…At 90 days, all the mortars deviate from the bisector and present a greater contribution in flexural than in compressive strength. Similar results were found in the literature [10]. …”

Section: Mechanical Strengthsupporting

confidence: 93%

Blended cement hydration assessment by thermogravimetric analysis and isothermal calorimetry

et al. 2018

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Abstract. In the present study, the hydration of Portland cement pastes containing 5%, 10%, 15% and 20% tuff, limestone filler and granodiorite was investigated by thermogravimetric analysis coupled with differential scanning calorimetry and microcalorimetry isotherm. The monitoring of the hydration kinetics by thermogravimetric analysis made it possible to quantify the quantity of water combined with the cement (nonevaporable water) and the degree of hydration. By coupling this technique to the differential scanning calorimetry, it was also possible to measure the energy absorbed or released by the material during its decomposition. The results showed that the non-evaporable water content and the degree of hydration of the mixtures containing various mineral admixtures were relatively lower with respect to the reference mixture when as the content of mineral admixture increased. The effect of the evolution of the hydration process on the mechanical properties of mortars was also monitored. The relative variation of the compressive strength to that of the flexural strength was evaluated at 7, 28 and 90 days. Results showed that all the mixtures have a greater contribution in flexion than in compression.

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“…At 90 days, all the mortars deviate from the bisector and present a greater contribution in flexural than in compressive strength. Similar results were found in the literature [10]. …”

Section: Mechanical Strengthsupporting

confidence: 93%

Blended cement hydration assessment by thermogravimetric analysis and isothermal calorimetry

et al. 2018

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“…The aggregates from the central region of Thailand have unit weight of 1,482 kg/m 3 , the bulk specific gravity of 2.67, while the absorption and percentage of voids were 0.40 % and 0.60%, respectively, according to the test followed ASTMC 29/C 29M -97 [16] The greenish natural zeolite in this study, clinoptilolite commercial grade type in Thailand(NZ), was ground to obtain the particle size smaller than 149 µm with an average size of 20 µm, using wet sieve analysis on No.100 standard sieve and image processing. Since the effectiveness of large amount of cement replacement were widely reported [6,9], the percentages replacement of ground natural zeolite in this study were 10 and 20.…”

Section: Methodsmentioning

confidence: 99%

“…Natural zeolite is a hydrated aluminosilicate with Si-O and Al-O tetrahedral bonded as a building unit. It has been widely reported as an effective pozzolan for concrete in strength and durability aspects due to its exchangeable cation content and the crystallinity in addition to pozzolanic reaction and filling effects [6][7][8]. The exchangeable alkali cation that contain in most zeolite or cation exchange capability (CEC) effectively altered the chemistry of cement pore solution.…”

Section: Introductionmentioning

confidence: 99%

“…The exchangeable alkali cation that contain in most zeolite or cation exchange capability (CEC) effectively altered the chemistry of cement pore solution. It strongly affected CSH product in concrete and sometimes be classified to lay between silica fume and fly ash, strongly than some other pozzolan [6,9]. Partial cement replacement of natural zeolite has been reported to effectively reduce the expansion due to ASR [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Synthetic and Natural Zeolite on ASR Expansion

Sujjavanich¹,

Wongtanasarasin²,

Kongkachuichay³

2017

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Abstract. The cation exchange capability (CEC), pozzolanic reaction, and filling effects are important keys of natural zeolite for mitigation of Alkali Silica Reaction (ASR), but variation of the zeolite's composition is a major problem when it is utilized. This may not be the case for synthetic zeolite. This paper presents the effects of natural and synthetic zeolite on Alkali Silica Reaction's expansion control. The percentage cement replacement of synthetic zeolite A (SZ) were 0.5, 1.0, 1.5, 2.5, 5,7.5, and 10 and ground natural zeolite, clinoptilolite (NZ), were 10 and 20. It was found that the large percentage replacement (10-20%) changed behaviors of fresh and hardened mixtures significantly. Large replacements of SZ (i.e., 7.5 and 10%) significantly reduced workability and compressive strength, and increased expansion. Slight reductions in expansion were found for the use of small percentage replacement (SZ<5.0%). Chemical analysis and strength reactivity index tests revealed the non-pozzolanic properties of synthetic zeolite, but not the ground natural one, NZ. The NZ exhibited both pozzolanic reactivity and the capability to significantly reduce expansion. At 20% replacement of NZ, the expansion significantly reduced to none at 14 days of acceleration and less than 0.02% at the longer duration of 28 days. It was confirmed that the high CEC of the studied synthetic zeolite is not the key factor for the effective mitigation for ASR.

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“…It is used in great amounts as a pozzolanic material in places like China (Najimi et al, 2012), Iran (Ahmadi & Shekarchi, 2010) and Cuba (Rosell et al, 2006), among others. In China, it is widely used as an addition to cement and the total amount of zeolite consumed for this purpose is as much as 30 million tons a year (Poon et al, 1999).…”

Section: State Of the Artmentioning

confidence: 99%

Zeolite, Study of Aptitude as a Natural Pozzolan Applied to Structural Concrete

Raggiotti

Positieri

Locati³

et al. 2015

Revista de la Construcción

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Nowadays, concrete is one of the most widely used construction materials due to its low price, appropriate mechanic characteristics and durability. Also, due to its ease to adopt diverse forms and sizes (Najimi et al., 2012). Owing to the importance in the use of concrete as a structural material and to its impact in the environment as a consumer of great quantities of natural resources and emitter of CO2 in the concrete industry, it is necessary to develop, from the science of materials, mixtures that support the growth of the construction industry and that consider the environment. Therefore, it becomes necessary to develop energetically efficient materials. A natural zeolite was studied as a material with potential pozzolanic activity and as partial replacement in different percentages of Portland cement in structural concrete. The results of the mechanic trials in concrete samples prove the feasibility of using this element as pozzolanic material.Keywords: Zeolite, Concrete, Pozzolan, Mineral Admixture, Replacement. ResumenEn la actualidad, el hormigón es uno de los materiales de construcción más ampliamente utilizados debido a su bajo precio, apropiadas características mecánicas y de durabilidad, así como por su facilidad de adoptar diversas formas y tamaños (Najimi et al., 2012). Debido a la importancia del uso del hormigón como material estructural de construcción y a su impacto ambiental como consumidor de grandes cantidades de recursos naturales y emisor de CO2 en la industria del cemento, es necesario desarrollar, desde la ciencia de materiales, mezclas que acompañen el crecimiento de la industria de la construcción considerando el medioambiente; es decir desarrollar materiales energéticamente eficientes. Se estudió una zeolita natural como un material con potencial actividad puzolánica y como reemplazo parcial en distintos porcentajes del cemento pórtland en hormigones estructurales. Los resultados de ensayos mecánicos en hormigones evidencian la factibilidad de utilizar esta adición como material puzolánico.

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A study on the hydration rate of natural zeolite blended cement pastes

Cited by 220 publications

References 10 publications

Blended cement hydration assessment by thermogravimetric analysis and isothermal calorimetry

Blended cement hydration assessment by thermogravimetric analysis and isothermal calorimetry

Effect of Synthetic and Natural Zeolite on ASR Expansion

Zeolite, Study of Aptitude as a Natural Pozzolan Applied to Structural Concrete

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