Effect of sand content on strength and pore structure of cement mortar

Bu, Jingwu; Tian, Zhenghong; Zheng, Sixun; Zilong, Tang

doi:10.1007/s11595-017-1607-9

Cited by 54 publications

(14 citation statements)

References 37 publications

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“…It is noted from Table (1) that the available water values ranged between 60-133 .cm 3 .cm -3 , where the values of the available water content were related to the soil texture. In the soils with loam and sandy clay loam textures, the values of the available water were higher than in sandy loam soils, due to the fact that the total pore size in soils with a higher clay content is much higher than soils with a higher content of coarse separates, although the diameter of the pores in coarse-textured soils is higher than that of fine-textured soils, and this was confirmed by all references in soil physics and water sciences [27][28][29]. Figure (9) shows the spatial distribution of the ready water content in the soils of the study area.…”

Section: Available Watersupporting

confidence: 56%

Evaluation of Soil Quality and Health Indices in Relation to Soil Physical Properties of Fedak Farm in Holly Najaf Province

AlWazzan

Atti

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Fadak farm project was selected to conduct this study in and to evaluate the state of quality and health indices in term of soil physical properties, where this farm is located in Holly Najaf Governorate. Some physical properties (soil texture, mean weight diameter, bulk density, porosity, infiltration rate, saturated hydraulic conductivity and available water) were selected to assess the quality then health indices, Results showed that classes of moderate and poor soil health were dominated in lands of this farm for physical properties It was noted that the class good of soil health wasnot collaterally appeared in areas for the physical characteristics.

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Section: Available Watersupporting

confidence: 56%

Evaluation of Soil Quality and Health Indices in Relation to Soil Physical Properties of Fedak Farm in Holly Najaf Province

AlWazzan

Atti

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…The high energy consumption and CO 2 global emission are the major drawback of cement production, which results in the unsustainability of concrete 3 – 5 . Moreover, the discontinuity and heterogeneity are generated due to sand and aggregate composition and low binder in the concrete matrix caused by a low water-cement ratio, which is indicated by micro-crack forming 6 . Consequently, the strength and durability of concrete will depress 7 – 9 .…”

Section: Introductionmentioning

confidence: 99%

Bacteria incorporated with calcium lactate pentahydrate to improve the mortar properties and self-healing occurrence

Chaerun

Syarif

Wattimena

2020

Sci Rep

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Concrete can be harmful to the environment due to its high energy consumption and CO2 emission and also has a potential crack formation, which can promote a drop in its strength. Therefore, concrete is considered as a non-sustainable material. The mechanisms by which bacterial oxidation of organic carbon can precipitate calcite that may fill the voids and cracks on cement-based materials have been extensively investigated to prevent and heal the micro-cracks formation. Hence, this study focused on utilizing a new alkaliphilic bacterial strain indigenous to an Indonesian site, Lysinibacillus sphaericus strain SKC/VA-1, incorporated with calcium lactate pentahydrate, as a low-cost calcium source, with various bacterial inoculum concentrations. The bacterium was employed in this study due to its ability to adapt to basic pH, thus improving the physical properties and rejuvenating the micro-cracks. Experimentally, the addition of calcium lactate pentahydrate slightly affected the mortar properties. Likewise, bacteria-incorporated mortar exhibited an enhancement in the physical properties of mortar. The highest improvement of mechanical properties (an increase of 45% and 36% for compressive and indirect tensile strength, respectively) was achieved by the addition of calcium lactate pentahydrate incorporated with 10% v/v bacterial inoculum [about 7 × 107 CFU/ml (colony-forming unit/ml)]. The self-healing took place more rapidly on bacterial mortar supplemented with calcium lactate pentahydrate than on the control specimen. XRD analysis demonstrated that the mineralogical composition of self-healing precipitates was primarily dominated by calcite (CaCO3), indicating the capacity of L. sphaericus strain SKC/VA-1 to precipitate calcite through organic carbon oxidation for self-healing the artificial crack on the mortar. To our knowledge, this is the first report on the potential utilization of the bacterium L. sphaericus incorporated with calcium lactate pentahydrate to increase the mortar properties, including its self-healing ability. However, further study with the water-cement ratio variation is required to investigate the possibility of using L. sphaericus and calcium lactate pentahydrate as an alternative method rather than reducing the water-cement ratio to enhance the mortar properties.

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“…9d). These behaviours are probably related to a decrease in the charge transfer resistance as a result of a higher ionic strength and a sand filler effect, demonstrating the impact on the hydration kinetics produced by the addition of sand (Feldman, 1986;McCarter and Garvin, 1989;Bu et al, 2017).…”

Section: Effects Of Sand Additionmentioning

confidence: 97%

“…This perturbation is not only related to the maximum release of heat (sulphate depletion peak, (Fig. 8a) but also to the impact of sand on the microstructural development, deposition of hydrated products such as CH, and pore size distribution and content (Bu et al, 2017).…”

Section: Effects Of Sand Additionmentioning

confidence: 99%

Early-age characterisation of Portland cement by impedance spectroscopy

Gallardo

Provis

2022

Advances in Cement Research

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This paper applies alternating current impedance spectroscopy to assess the effect of different sand, anhydrite, and water contents on the electrochemical response of Portland cement in the early stages of hydration. Potential factors that may affect impedance measurements and data interpretation are also discussed, such as the complexity of cement chemical composition, its physical properties and hydration kinetics, and technique limitations. The impedance data obtained are benchmarked against different supporting techniques and literature data, showing a strong relationship among hydration rates as determined by thermochemistry, setting time measurements by physical approaches, pore fluid chemistry, electrical conductivity, and the impedance behaviour observed. The results demonstrate that ACIS is a sensitive technique to assess cement hydration, enabling differentiation of changes in the water and cement content, hydration degree, and microstructural development during the first 24 hours after mixing.

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Effect of sand content on strength and pore structure of cement mortar

Cited by 54 publications

References 37 publications

Evaluation of Soil Quality and Health Indices in Relation to Soil Physical Properties of Fedak Farm in Holly Najaf Province

Evaluation of Soil Quality and Health Indices in Relation to Soil Physical Properties of Fedak Farm in Holly Najaf Province

Bacteria incorporated with calcium lactate pentahydrate to improve the mortar properties and self-healing occurrence

Early-age characterisation of Portland cement by impedance spectroscopy

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