Effect of pozzolanic waste materials on hydration peculiarities of Portland cement and granulated expanded glass-based plaster

Antonovič, Valentin; Sikarskas, Donatas; Malaiškienė, Jurgita; Boris, Renata; Stonys, Rimvydas

doi:10.1007/s10973-019-08464-6

Cited by 16 publications

(13 citation statements)

References 38 publications

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“…Several characteristic periods of heat release rate taking place one by one may be separated on a calorimetric curve of hydration of Portland cement and cement containing pozzolanic additives. This typical shape of calorimetric curve is well-known and was described in literature (e.g., in [ 14 , 18 , 19 , 20 , 38 , 63 , 64 , 65 , 66 ]).…”

Section: Resultsmentioning

confidence: 61%

“…This by-product from the petrochemical industry, because of its physicochemical properties, is very attractive as a component of binding mixtures. The spent catalyst was investigated by us previously in the context of the possibility of its use as an active additive modifying the properties of materials made out of Portland cement [ 34 , 35 , 36 , 37 , 38 ] and calcium aluminate cement [ 34 , 39 , 40 , 41 , 42 , 43 ]. Studies on this by-product and its use as a component of various binding mixtures, including geopolymers, have also been carried out by other research teams [ 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ].…”

Section: Introductionmentioning

confidence: 99%

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Hydration Processes of Four-Component Binders Containing a Low Amount of Cement

2022

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Results of research on hydration of four-component binders containing very high amounts of supplementary cementitious materials were presented. The samples were composed of blended pozzolana (a mix of conventional fly ash and spent aluminosilicate catalyst), cement (about 20 wt.% in the binder) and Ca(OH)2. Spent aluminosilicate catalyst was proposed as activating component which can improve properties of low-cement blends, while the role of Ca(OH)2 was to enhance pozzolanic reaction. Early and later hydration periods of such blends were investigated by calorimetry, TG/DTG, FTIR and X-ray diffraction. Initial setting time as well as compressive strength were also determined. It was concluded that enhancement of reactivity and improvement of properties of fly ash–cement binders are possible by replacing a part of fly ash with more active fine-grained pozzolana and introducing additional amounts of Ca(OH)2. The spent catalyst is mainly responsible for accelerating action during the first hours of hydration and for progress of early pozzolanic reaction. Fly ash develops its activity over time, thus synergic effect influences the later properties of composites. Samples containing blended pozzolana exhibit shorter initial setting times and higher compressive strength, as well as faster consumption of Ca(OH)2 compared to the reference. Investigated mixtures seem to be promising as “green” binders, alternatives to cement, after optimizing their compositions or additional activating procedure.

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Section: Resultsmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Hydration Processes of Four-Component Binders Containing a Low Amount of Cement

2022

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“…The total heat released by specimens with a higher content of PVA fibers of Type A (0.5%) was almost the same as in control specimens. Hydrophilic fibers of Type A with a rather big surface area are supposed to change the pattern of water movement in the cement matrix [10][11][12] thus activating hydration at the surface of the fibers. Apparently this characteristic is reflected in the higher heat release in the cement paste during the first 20 min after mixing the composition with water (Figure 6a, left corner), due to the better wetting effect of the cement particles and the initial reactions (formation of ettringite).…”

Section: Calorimetrymentioning

confidence: 99%

“…The shrinkage of the composite is limited physically by a strong adhesion between the fibre and the cement matrix [8,9]; besides, the fibres increase the tensile strength of the composite, which also reduces shrinkage and potential cracking. PVA fibers can change the pattern of water movement in the cementitious matrix by attracting more water to the surface of the fibers [10]. An extremely strong bond between the fibers and the cement matrix in the conventional cement mix is formed due to the hydrophilic character of PVA fibers.…”

Section: Introductionmentioning

confidence: 99%

“…It has pozzolanic activity and also improves the mechanical properties of the material [27]. Our previous research work [10] revealed that cement hydration can be controlled and mechanical properties of lightweight composite materials can be improved through the combined use of FCCCW, which accelerates the hydration of Portland cement, and MW addition, which has a retarding effect. On the other hand, an excessively strong a chemical bond between PVA and cementitious hydrates can reduce the elasticity of the composite, cause the formation of cracks, and premature breakage of the fibers [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Modification of the Structure and Properties of Lightweight Cement Composite with PVA Fibers

et al. 2021

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This study addresses the application of polyvinyl alcohol (PVA) fibers to improve the performance of lightweight cement composites with pozzolans. Blended cement mixes based on expanded glass granules were modified with PVA fibers (Type A: Ø40 µm, L = 8 mm and Type B: Ø200 µm, L = 12 mm). The following research methods were used to analyse the effect of the fibers on the structure of cement matrix and physical-mechanical properties of lightweight composite: SEM, XRD, DTG, calorimetry tests, and standard test methods of physical and mechanical properties. Results from the tests showed that a denser layer of hydrates was formed around the PVA fiber and the amounts of portlandite, CSH, and CASH formed in the specimens with PVA were found to be higher. PVA fibers of Type A accelerated hydration of the cement paste, slightly increased the compressive strength of the lightweight composite, but had no significant effect on the values of density, ultrasonic pulse velocity and flexural strength. The shrinkage of cement composite was significantly reduced using both types of PVA fiber and both types of PVA fibers increased the fracture energy of lightweight cement composite with expanded granules.

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