Relationship between fracture area and tensile strength of cement paste with supplementary cementitious materials

Li, Yue; Li, Jiaqi

doi:10.1016/j.conbuildmat.2015.01.052

Cited by 35 publications

(9 citation statements)

References 15 publications

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“…In addition, F1 shows the largest area under the curves. In fact, neat cement paste is highly brittle due to its high porosity, large pores and, consequently, the rapid growth of cracks 24 . In the reinforced composites, magnetite nanoparticles (especially F1 sample) can easily locate between cement grains and act ahead of crack tip as a reinforcing filler, preventing the propagation of microcracks by elastic crack pinning 25 .…”

Section: Resultsmentioning

confidence: 99%

A comparative study on the mechanical, physical and morphological properties of cement-micro/nanoFe3O4 composite

Ghazanlou

Jalaly

Sadeghzadeh

et al. 2020

Sci Rep

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in this study, fabrication of a composite containing the ordinary portland cement (opc) and magnetite (fe 3 o 4 ) micro/nanoparticles is reported. In the first stage, the cement paste samples with a fixed 0.2 wt.% Fe 3 o 4 additive in four different particle sizes (20-40 nm, 80-100 nm, 250-300 nm, and 1-2 µm) were prepared to check the effect of magnetite size. Magnetite was found to play an effective role in reinforcing cement matrix. The results showed that the cement paste reinforced by magnetite nanoparticles of 20-40 nm size range had the highest compressive, flexural, and tensile strengths compared to those of the other samples reinforced by larger particles. in the second stage, various amounts of the fe 3 o 4 nanoparticles of 20-40 nm size range were added to the cement to evaluate the influence of magnetite amount and find the optimized reinforcement amount. It was revealed that adding 0.25 wt.% Fe 3 o 4 nanoparticles of 20-40 nm size range, as the optimal specimen, increased the compressive strength, flexural strength and tensile splitting strength by 23-32, 17-25, and 15-19%, respectively, and decreased the electrical resistance by 19-31%.

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Section: Resultsmentioning

confidence: 99%

A comparative study on the mechanical, physical and morphological properties of cement-micro/nanoFe3O4 composite

Ghazanlou

Jalaly

Sadeghzadeh

et al. 2020

Sci Rep

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show abstract

“…From formula (5), it can be seen that several influence factors are already involved in this prediction model, and the test parameters also have good adaptability. is new strength model is more applicable for predicting the UCS of CPB samples consisting of waste-unclassified tailings.…”

Section: Development Of a New Predictionmentioning

confidence: 99%

“…Paste backfill, without segregation and dewatering, also has flow ability [2], which is mainly composed of three parts, namely, unclassified tailings, cemented materials, and water. Unclassified tailings, containing a certain proportion of fine particles [3,4], has a large surface area [5,6], thus leading to a strong water saturation performance [7]. erefore, the paste slurry possesses good plasticity properties and easy for transmission [8].…”

Section: Introductionmentioning

confidence: 99%

A Novel Prediction Model of Strength of Paste Backfill Prepared from Waste-Unclassified Tailings

Zhang

2019

Advances in Materials Science and Engineering

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Paste backfilling is an important support for the development of green mines and deep mining. It can effectively reduce a series of risks of underground goaf and surface tailings ponds. Reasonable strength of backfill is an effective guarantee for controlling ground stress and realizing safe mining function. Under the combination of complex materials and local conditions, ensuring the optimal design and effective proportion for paste backfill strength is the bottleneck problem that restricts the safety, economy, and efficiency of filling mining. The strength developing trend of paste backfilling prepared from waste rock and unclassified tailings has been studied. Different levels of cement contents, tailings-waste ratios, and slurry concentrations were investigated through orthogonal design to obtain the relationship between the UCS and the multi-influential factors. Combined with the experimental results and the previous strength prediction models, the waste rock-unclassified tailings paste strength prediction model was proposed. Introducing the water-cement ratio, the cement-tailings ratio, the amount of cement, and the packing density that characterizing the overall gradation of unclassified tailings and waste rock, as well as the curing time, a strength prediction model of multifactors was developed. Moreover, the microscopic structure of the paste prepared from waste-unclassified tailings was analyzed with an Environment Scanning Electron Microscope (ESEM), and the influence mechanism was ascertained. The weight coefficient of strength development is carded in this paper, and the strength model of unclassified tailings-waste paste considering five factors is obtained, which is of great significance to guide the mining engineering.

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“…Compressive strength of self-compacting concrete containing recycled fine powder was increased with the addition of ground slag. Splitting tensile strength of self-compacting concrete with recycled fine powder was lower than those with slag and limestone, and greater than conventional concrete, it is due to filler effect [22]. The addition of ground slag together with recycled fine powder increased splitting tensile strength with recycled fine powder, as shown in (Fig.…”

Section: Results Of Series 2 Experimentsmentioning

confidence: 86%

Experimental Study on the Effects of Recycled Concrete Powder on Properties of Self-Compacting Concrete

Quan¹,

Kasami²

2018

TOCIEJ

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Introduction:Although hundreds million tons of concrete wastes have been generated annually in China, the use of recycled aggregate for concrete is limited because of low density and high absorption due to adhered cement paste and mortar.Methods:A new method to produce high quality recycled aggregate by heating and grinding concrete rubbles to separate cement portions adhering to aggregate was developed recently. In this process by-product powder with the fineness of 400m2/kg is generated. By-product recycled fine powder consists of fine particles of hydrated cement and crushed aggregate. To use the recycled fine powder as concrete additives two series of experiments were performed to make clear of the effect of recycled fine powder.Results and Conclusion:Self-compacting concrete with recycled fine powder, granulated blast furnace slag and granulated limestone were tested for slump flow, compressive strength, modulus of elasticity and drying shrinkage. Reduction in super plasticizing effect of high range water reducer was found for concrete with recycled powder. Compressive strength of concrete with recycled fine powder was the same as those with granulated limestone, and lower than those with granulated blast furnace slag. Concrete with recycled fine powder showed lower elastic modulus and higher drying shrinkage than those with granulated blast furnace slag and granulated limestone. The recycled fine powder is usable for self-compacting concrete without further processing, despite the possible increase in dosage of high range water reducer for a given slump flow and in drying shrinkage. The addition of granulated blast furnace slag together with recycled powder to self-compacting concrete improved super plasticizing effect of high range water reducer and properties of concrete.

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Relationship between fracture area and tensile strength of cement paste with supplementary cementitious materials

Cited by 35 publications

References 15 publications

A comparative study on the mechanical, physical and morphological properties of cement-micro/nanoFe3O4 composite

A comparative study on the mechanical, physical and morphological properties of cement-micro/nanoFe3O4 composite

A Novel Prediction Model of Strength of Paste Backfill Prepared from Waste-Unclassified Tailings

Experimental Study on the Effects of Recycled Concrete Powder on Properties of Self-Compacting Concrete

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