Effect of limestone fines as a partial replacement of cement on the chemical, autogenous, drying shrinkage and expansion of mortars

Khatib, Jamal; Ramadan, Rawan; Ghanem, Hassan; Elkordi, Adel; Sonebi, Mohammed

doi:10.1016/j.matpr.2022.01.336

Cited by 9 publications

(9 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

See 3 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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…Li et al found that MKGs underwent three stages of chemical shrinkage, i.e., chemical shrinkage, chemical expansion, and chemical shrinkage again [35]. However, chemical shrinkage is less likely to occur during the hydration of cement because of the great toughness and particle skeleton of cement [36]. In an open environment, drying shrinkage is caused by the evaporation of water from the pore structure of the geopolymer [37], which can be much greater than that of OPC [38,39].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Volumetric Stability of Metakaolin-Based Geopolymer Composites with Organic Modifiers WER and SCA

Zhang,

Zang,

Shan

2024

Buildings

View full text Add to dashboard Cite

Shrinkage during hardening and curing is one of the largest challenges for the widespread application of metakaolin-based geopolymers (MKGs). To solve this problem, a silane coupling agent (SCA) and waterborne epoxy resin (WER) were used to synthesize MKG composites. The individual and synergistic effects of the SCA and WER on chemical, autogenous, and drying shrinkage were assessed, the modification mechanisms were investigated by microstructural characterization, and shrinkage resistance was evaluated by the chloride ion permeability of MKG composite coatings. The results showed that the SCA and WER significantly decreased the chemical shrinkage, autogenous shrinkage, and drying shrinkage of the MKG, with the highest reductions of 46.4%, 131.2%, and 25.2% obtained by the combination of 20 wt% WER and 1 wt% SCA. The incorporation of the organic modifiers densified the microstructure. Compared with the MKG, the total volume of mesopores and macropores in MKG-WER, MKG-SCA, and MKG-WER-SCA decreased by 11.5%, 8.7%, and 3.8%, respectively. In particular, the silanol hydrolyzed from the SCA can react with the opened epoxy ring of the WER and the aluminosilicate oligomers simultaneously to form a compact network and resist shrinkage during the hardening and continuous reaction of the geopolymer. Furthermore, the apparently lowered chloride ion diffusion coefficient of concrete (i.e., reduction of 51.4% to 59.5%) by the WER- and SCA-modified MKG coatings verified their improved shrinkage resistance. The findings in this study provide promising methods to essentially solve the shrinkage problem of MKGs at the microscale and shed light on the modification mechanism by WERs and SCAs, and they also suggest the applicability of MKG composites in protective coatings for marine concrete.

show abstract

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

et al. 2023

View full text Add to dashboard Cite

Effect of limestone fines as a partial replacement of cement on the chemical, autogenous, drying shrinkage and expansion of mortars

Cited by 9 publications

References 20 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

Enhancing Volumetric Stability of Metakaolin-Based Geopolymer Composites with Organic Modifiers WER and SCA

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

Contact Info

Product

Resources

About