An investigation into the hydration and microstructure of cement pastes modified with glass powders

Kamali, Mahsa; Ghahremaninezhad, Ali

doi:10.1016/j.conbuildmat.2016.02.085

Cited by 115 publications

(82 citation statements)

References 50 publications

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“…The influence of the amount of GP was widely studied [11,19,20], but it was determined that optimal results are achieved between 10-30% [1,11], and even amounts up to 15% enhance the compressive strength [21]. The hydration of cement is also improved because of the particle size and the pozzolanic behavior of GP [22]. According to the physical and chemical criteria of ASTM C 618 and European standards (UNE-EN 450-1), glass can be considered a pozzolanic cementitious material [23].…”

Section: Introductionmentioning

confidence: 99%

Use of Waste Glass as A Replacement for Raw Materials in Mortars with a Lower Environmental Impact

et al. 2019

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Glass waste used in mortars or concretes behaves similar to cement, with resulting environmental benefits. In this light, the behavior of glass powder of various particle sizes has been analyzed as a cement replacement in mortars, in an attempt to minimize the loss of strength and durability, and maximize the amount of materials replaced. The dry density, water accessible porosity, water absorption by immersion, capillary absorption coefficient, ultrasonic pulse velocity and both compressive and flexural strengths were studied in the mortars. Furthermore, a statistical analysis of the obtained results and a greenhouse gases assessment were also performed. In view of the results obtained, glass powder of 38 microns allows up to 30% of the cement to be replaced, due to the filler effect combined with its pozzolanic activity. Moreover, it has been observed that glass powder size is one of the factors with the greatest influence among the properties of porosity, absorption and capillarity. On the other hand, in the mechanical properties, this factor does not contribute significantly more than the amount of glass powder. Finally, the greenhouse gasses analysis shows that the incorporation of glass powder reduces the CO2 emissions associated with mortar up to 29.47%.

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Section: Introductionmentioning

confidence: 99%

Use of Waste Glass as A Replacement for Raw Materials in Mortars with a Lower Environmental Impact

et al. 2019

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“…On the other hand, the fly ash has pozzolanic activity, which means that it reacts with portlandite produced along the clinker hydration, giving rise to the formation of additional hydrated products, thus increasing the refinement of the pore network of mortars and concretes [9][10][11]. The abovementioned pore refinement produced by both additions improves the performance of cementitious materials, for example their chloride ingress resistance [12][13][14][15][16][17] and their permeability [18].…”

Section: Introductionmentioning

confidence: 99%

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

et al. 2018

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Nowadays, getting a more environmentally sustainable cement production is one of the main goals of the cement industry. In this regard, the use of active additions, like fly ash and ground granulated blast-furnace slag, has become very popular. The behaviour, in the short-term, of cement-based materials with those additions is well-known when their hardening is produced under optimum conditions. However, real structures are exposed to different environments during long periods, which could affect the development of microstructures and the service properties of cementitious materials. The objective of this work is to analyse the effects in the long-term (up to 5 years approximately) produced by the exposure to different non-optimum laboratory conditions in the microstructure, mechanical and durability properties of mortars made with slag and fly ash commercial cements. Their performance was compared to that observed for ordinary Portland cement (OPC) mortars. The microstructure has been analysed using mercury intrusion porosimetry. The effective porosity, the capillary suction coefficient, the chloride migration coefficient and mechanical strengths were analysed too. According to the results, mortars prepared using slag and fly ash sustainable commercial cements, exposed to non-optimum conditions, show a good performance after 5-years hardening period, similar or even better than OPC mortars.

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“…However, depending on the particle size, the glass may instead exhibit pozzolanic activity and thus inhibit the alkali-aggregate reaction (14)(15)(16). Some studies investigated the effect of glass microparticles on the properties of Portland cement composites and indicated that glass did not affect the setting time, soundness, and flexural strength of the material (15,17,18); however, it did have a negative effect on the workability (15,19). Few studies cover the hydration heat and elastic modulus of glasscontaining cements (17,19), and there are conflicting results on the effect of glass on the compression strength of the material (16,(18)(19)(20)(21).…”

Section: Introductionmentioning

confidence: 99%

“…Some studies investigated the effect of glass microparticles on the properties of Portland cement composites and indicated that glass did not affect the setting time, soundness, and flexural strength of the material (15,17,18); however, it did have a negative effect on the workability (15,19). Few studies cover the hydration heat and elastic modulus of glasscontaining cements (17,19), and there are conflicting results on the effect of glass on the compression strength of the material (16,(18)(19)(20)(21). Additionally, studies show inconclusive results as to the influence of glass color on the properties of compounds in both fresh and hardened states (15,17,21,22).…”

Section: Introductionmentioning

confidence: 99%

Influence of soda-lime waste glass microparticles on workability and thermal properties of portland cement compounds

et al. 2019

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Numerous studies have investigated the use of waste glass as a partial substitution in Portland cement. Nonetheless, it seems there is no consensus about the influence of particle size and color on the behavior of the compounds. This work investigates the influence of soda-lime glass microparticles on the properties of cement and mortar in both fresh and hardened states. The effects of partial substitution (10 and 20%) of the cement by colorless and amber glass particles with dimensions of approximately 9.5 mm were investigated. The results revealed that the substitutions did not significantly affect the setting times, nor the mechanical properties of mortar at longer curing times. The influence of glass content and chemical composition on workability and hydration heat was also observed. The waste glass samples showed lower thermal diffusivity than the control sample. Thermal emissivity was not influenced by the presence of glass microparticles.

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An investigation into the hydration and microstructure of cement pastes modified with glass powders

Cited by 115 publications

References 50 publications

Use of Waste Glass as A Replacement for Raw Materials in Mortars with a Lower Environmental Impact

Use of Waste Glass as A Replacement for Raw Materials in Mortars with a Lower Environmental Impact

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

Influence of soda-lime waste glass microparticles on workability and thermal properties of portland cement compounds

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