Chemical shrinkage of paste and mortar containing limestone fines

Khatib, Jamal; Ramadan, Rawan; Ghanem, Hassan; Elkordi, Adel; Baalbaki, Oussama; Kırgız, Mehmet Serkan

doi:10.1016/j.matpr.2022.01.288

Cited by 10 publications

(16 citation statements)

References 26 publications

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“…Thus, water absorption was higher in the LRA and LSR mortars than LSF mortar. The SEM images of all lime composite mortars exhibits a maximum density of the spherical microstructure at both 7 and 28 curing days, while the SEM images of lime mortar do not have any hydrate growth and only the thick white calcium carbonate granules were viewed [47][48][49][50][51][52][53][54]. As per EDX, lime has an increasing content of calcium from 7 to 28 days as a result of carbonation.…”

Section: Water Absorptionmentioning

confidence: 88%

“…Since carbonation is a slow process, the microstructure growth goes on developing at latter stages. Overall, the lime composite mortar exhibits the dense spherical hydrates (Type III -CSH) [14,18,[47][48][49][50][51][52][53][54]. There was no formation of acicular and hexagonal CSH morphologies found in the samples.…”

Section: Water Absorptionmentioning

confidence: 91%

“…It was observed that the lime mortar bar exhibits higher shrinkage than others. Carbonation of lime is initiated after the hardening of lime mortar leads to surface voids [44][45][46][47][48][49][50][51][52][53][54]. Lime composite mortar undergoes less shrinkage due to the formation of hydration products as a result of pozzolanic activity and hydration.…”

Section: Drying Shrinkagementioning

confidence: 99%

“…Hence, small pores are created in the surface of mortar after the evaporation of released water. At higher curing ages, RHA absorbs less water because of the complete utilisation of active silica and therefore the reduction of permeable voids in it [47][48][49][50][51][52][53][54]. At a saturated condition, water penetrated through these pores and filled up the voids.…”

Section: Water Absorptionmentioning

confidence: 99%

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Mechanical and Microstructural Properties of Composite Mortars with Lime, Silica Fume and Rice Husk Ash

Malathy¹,

Shanmugam²,

Chung

et al. 2022

Processes

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A mixture of hydraulic lime and pozzolanic material can be used as a binder in making concrete and mortar for energy-efficient construction purposes. Generally, lime possesses lower strength and higher setting time. By introducing pozzolans in the lime mortar, their cementitious properties could be increased and could compete with the cement mortars. The use of pozzolan-lime binder in mortar reduces the utilisation of cement, and hence reduces the environmental problem originating from cement production. This study mainly deals with the mechanical and microstructural properties of lime and lime composite mortars made up of hydraulic lime, silica fume and rice husk ash. Three composite mortars were made with the following combination such as hydraulic lime-silica fume (LSF), hydraulic lime-rice husk ash (LRA) and hydraulic lime-silica fume-rice husk ash (LSR). Further, their properties were compared with the pure lime mortar. Preliminary investigations were made on the lime reactivity and pozzolanic reactivity tests. It was understood that silica fumes have a (15%) better reactivity than rice husk ash. The introduction of pozzolans in the lime mortar promotes fresh, hardened and microstructural properties. The 28 days’ compressive strength of lime composite mortars achieved more than 16 Mpa, while the lime mortar attained 4 Mpa. The combined effect of pozzolanic reaction, hydration and carbonation in the lime composite mortars achieved four times the strength of lime mortar at 28 days. A high peak of calcium carbonate was detected in lime mortar as a result of carbonation. The well-developed microstructure of calcium silicate hydrate and calcium hydroxide exhibits the formation of hydration products in the lime composite mortars as observed from a scanning electron microscope (SEM), energy-dispersive X-ray (EDX) and X-ray diffraction (XRD). Similar graphs of Fourier transform infrared spectroscopy (FT-IR) showed the presence of equivalent functional elements in all lime composite mortars.

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Section: Water Absorptionmentioning

confidence: 88%

Section: Water Absorptionmentioning

confidence: 91%

Section: Drying Shrinkagementioning

confidence: 99%

Section: Water Absorptionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanical and Microstructural Properties of Composite Mortars with Lime, Silica Fume and Rice Husk Ash

Malathy¹,

Shanmugam²,

Chung

et al. 2022

Processes

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“…Chemical shrinkage measurements were conducted following the ASTM C1608 standard [39] and established previous studies [40][41][42][43] were followed for consistency. The experimental procedure involved placing a mortar mix comprising PA fibers, cement, sand, and water into a 250 mL glass bottle to a depth of 2 cm (see Figure 3).…”

Section: Chemical Shrinkage Testmentioning

confidence: 99%

Effect of Adding Phragmites-Australis Fiber on the Mechanical Properties and Volume Stability of Mortar

Khatib,

Ramadan,

Ghanem

et al. 2024

Fibers

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In this research, the investigation focuses on the influence of Phragmites-Australis (PA) fibers on the mechanical properties and volume stability of mortar. A total of four mixtures were employed with varying amounts of locally sourced PA fibers ranging from 0.5% to 2% (by volume). Testing includes flexural strength, compressive strength, chemical shrinkage, drying shrinkage, autogenous shrinkage, and expansion. The findings show that the use of PA fibers caused a reduction in compressive and flexural strength. However, beyond 3 days of curing, an increase in flexural strength ranging from 7 to 21% was observed at 1% PA fiber compared to the control sample. Furthermore, the addition of PA fibers up to 2% effectively mitigates the dimensional stability of mortar samples. A gradual decrease in chemical, autogenous, and drying shrinkage as well as expansion occurs in mortar samples when % of PA fibers increases. At 180 days, this reduction was 37, 19, 15 and 20% in chemical shrinkage, autogenous shrinkage, drying shrinkage, and expansion, respectively, for a mix containing 2% PA fiber. Additionally, a hyperbolic model is proposed to predict the variation of length change with time. Also, a strong relationship is observed between chemical shrinkage and other length change parameters. Consequently, the environmentally friendly utilization of PA fibers demonstrates its potential to significantly enhance mortar durability in construction applications.

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Effect of Adding Phragmites-Australis Plant on the Chemical Shrinkage and Mechanical Properties of Mortar

et al. 2023

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Chemical shrinkage of paste and mortar containing limestone fines

Cited by 10 publications

References 26 publications

Mechanical and Microstructural Properties of Composite Mortars with Lime, Silica Fume and Rice Husk Ash

Mechanical and Microstructural Properties of Composite Mortars with Lime, Silica Fume and Rice Husk Ash

Effect of Adding Phragmites-Australis Fiber on the Mechanical Properties and Volume Stability of Mortar

Effect of Adding Phragmites-Australis Plant on the Chemical Shrinkage and Mechanical Properties of Mortar

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