The effect of polypropylene fiber with different length and dosage on the performance of alkali-activated slag mortar

Xu, Yangchen; Xing, Guohua; Zhao, Jiahua

doi:10.1016/j.conbuildmat.2021.124978

Cited by 26 publications

(6 citation statements)

References 33 publications

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“…The widely recognized mechanism of DS is that when the water gradually evaporates, surface tension is generated when the menisci are formed in the gel pores and capillary pores, thereby causing an equal compressive stress in the skeleton and causing volume shrinkage 14 , 15 . Current research primarily focuses on reducing the DS of AAMs by incorporating fibers 16 – 18 , chemical admixtures 4 , 19 , and mineral admixtures 20 , 21 , as well as changing the curing system 22 – 24 . Changing the curing system, while effectively reducing shrinkage, may also lead to a decrease in mechanical properties and issues of unstable internal curing humidity 24 .…”

Section: Introductionmentioning

confidence: 99%

Effect of borax-modified activator on mechanical properties and drying shrinkage of alkali-activated slag/metakaolin mortar

Chen,

Qin,

Chen

et al. 2024

Sci Rep

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Alkali-activated materials (AAMs) possess several advantages, such as high strengths and low carbon emissions. However, their application is hindered due to their significant shrinkage. This study explored the effect of borax-modified sodium silicate activator and metakaolin (MK) on the mechanical properties and drying shrinkage (DS) of alkali-activated slag (AAS) and AAS/MK (AASM) mortars. X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy were used to characterize the hydration products. The results showed that the DS reduction of the AAS mortar was related to decreased Na2O content, a reduction in the proportion of mesopores, and the formation of moisture-retaining borate compounds. The DS reduction of the AASM mortar was attributed to the ultra-fine differential effect induced by MK, reducing the connected pores. The modified activator combined with MK increased the chemically bound water content in the matrix. Additionally, the B–O bond and highly active MK improved compactness of the AASM mortar. The use of borax-modified activators and MK provides a new solution to address the significant shrinkage issue in AAMs. This sets the stage for AAMs to potentially replace OPC, contributing to low-carbon emissions and promoting environmental protection.

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Section: Introductionmentioning

confidence: 99%

Effect of borax-modified activator on mechanical properties and drying shrinkage of alkali-activated slag/metakaolin mortar

Chen,

Qin,

Chen

et al. 2024

Sci Rep

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“…This was achieved by adding PP fibres. In addition, there has been evidence of good bonding between the matrix and PP fibres, which is directly proportional to the enhancement of the material's mechanical characteristics (Xu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Effect of polypropylene fibre on cementitious mortar early shrinkage cracking using the eccentric-ring test

et al. 2023

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The effects of polypropylene fibres on mortar and cement-paste cracking were investigated using different amounts of fibre fractions and eccentric rings under restrained-shrinkage conditions. Eccentric-ring tests were conducted to investigate early-age shrinkage cracks. The characteristics of restricted cementitious materials were described by evaluating the cracking time and using concrete mixtures that are less likely to crack. Different fibre-volume fractions significantly enhanced the width, area, and age of cracking. Increasing the water-cement ratio and sand percentage increased the cracking age. The eccentric-ring test showed a greater susceptibility to cracking in cement-mortar composites. The mechanical strength was assessed, and the impact of polypropylene fibres was investigated.

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“…Related to the use of commercial fibres as reinforcement of binder materials, several studies have been conducted on cement mortars containing mainly PP, glass, or steel fibres. Xu et al [4] studied the influence of different lengths and dosages of PP fibres on the mechanical, porosity and ultimate toughness properties of cement composites. Other studies compared the effectiveness of using PP fibres instead of mineral fibres (i.e., carbon, basalt), achieving lower crack propagation, just as increased strength and stiffness of samples [5][6].…”

Section: Introductionmentioning

confidence: 99%

Comparative study of physico-mechanical properties of polypropylene fibre-reinforced gypsum composites

Romero-Gómez,

Rubio-de-Hita,

Pedreño-Rojas

et al. 2023

Proceedings of the 15th International Conference on X-Ray Microscopy – Xrm2022

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Nowadays, the growing demand of plastic is leading to an uncontrolled waste production that threats the Planet's health. Over 8 million tonnes of plastic debris go into the ocean annually because of poor end-life management. Single-use products represent one of the main sources of plastic pollution, due to its low recycling rate related to its large production. Among them, personal hygiene disposable products (e.g., non-degradable wet wipes) represent a hazardous concern to marine ecosystem because of their dumping into the sea, dragged away by wastewater currents. Classified as non-woven textiles, non-degradable wet wipes are made from polymeric fibres, mainly polypropylene (PP), that complicate their degradation in contact with water. The incorrect disposal society makes of this waste causes devasting blockages in sewerage network, with alarming environmental and economic consequences. In this sense, alternative solutions to promote the recycling of this waste are needed in support of governmental regulations. Thus, from construction sector and committed to the Circular Economy's objectives set by the European Green Deal, the present work evaluates the feasibility of using PP waste fibres from disposable wet-wipes, as alternative to commercial PP reinforcement fibres, to produce eco-friendly reinforced gypsum-based products. Two types of reinforced-gypsum composites were prepared by adding commercial polypropylene (PPF) and waste polypropylene (PPWF) fibres, respectively. Different addition levels of fibre (2, 2.5, 3 and 3.5% by weight of gypsum) were selected to develop each group of gypsum blends. Then, composites were subjected to an experimental campaign based on dry density, mechanical behaviour (flexural and compressive strength) and deformability pre-failure, following the guidelines stablished by standards and comparing the results with the control material. The results showed a slight decrease of density as the percentage of PPWF rose, when compared to reference gypsum. Despite of the fact that lower values of mechanical strength were got by composites containing PPWF compared to those reinforced by PPF, a significant improvement of flexural strength (up to ∼19.5%) was reached by mixtures with 2.5wt% PPWF content, in relation to control material. On the other hand, a decrease on compressive strength of composites with PPWF addition was observed, unlike the performance showed by gypsums with PPF content up to 2.5 wt% (∼4.5% increase). However, all the data were over the minimum strength values stablished by standard. Furthermore, greater plastic deformation was developed by fibre-reinforced gypsum before to reach the failure point, in comparison with control gypsum which presented a brittle failure. Finally, it could be inferred the effectiveness of commercial PPF to enhance the mechanical properties of gypsum composites, just as the feasibility of using recycled WPPF as eco-friendly replacement to obtain gypsums for construction applications with both mechanical and environmental improvements, so promo...

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The effect of polypropylene fiber with different length and dosage on the performance of alkali-activated slag mortar

Cited by 26 publications

References 33 publications

Effect of borax-modified activator on mechanical properties and drying shrinkage of alkali-activated slag/metakaolin mortar

Effect of borax-modified activator on mechanical properties and drying shrinkage of alkali-activated slag/metakaolin mortar

Effect of polypropylene fibre on cementitious mortar early shrinkage cracking using the eccentric-ring test

Comparative study of physico-mechanical properties of polypropylene fibre-reinforced gypsum composites

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