Strength and ultrasonic properties of cemented paste backfill

Erçıkdı, Bayram; Yılmaz, Tekin; Külekçi, Gökhan

doi:10.1016/j.ultras.2013.04.013

Cited by 107 publications

(38 citation statements)

References 33 publications

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“…As low as 7° internal friction angle was measured from 360 days curing CPB specimens with 5% cement ratio. Mixes with silt dominant particle size distribution, ∼77% solid (cement+tailings) content including 5-7% cement in solid and ∼23% water content by weight, which were tested in this study are typical CPB materials [28][29][30][31][32][33][34][35][36]. As 25 o was found to be a practically acceptable value of internal friction angle for CPB materials having no longer curing time than the period for start of the sulphate attack, cohesion values of CPB materials can be estimated using Equation 3 for different UCS values.…”

Section: Discussionmentioning

confidence: 99%

An Experimental Study on Shear Strength of Cemented Paste Backfill Materials

Komurlu¹,

Turan²,

Cihangir³

et al. 2017

SDÜ Fen Bil Enst Der

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Change in the mechanical parameters of cohesion and internal friction angle with variations in cement content and curing time of cemented paste backfill (CPB) materials was investigated carrying out a series of experimental study. In this scope, shear strength and uniaxial compressive strength (UCS) tests were performed to find out the failure properties of CPB samples. According to the results obtained from this study, a new factor is suggested to use in the MohrCoulomb failure criterion to better fit the envelope for CPB materials. As an important issue from this study, strength values of curing CPB specimens were found to dominantly increase because of the improvement in cohesion values instead of internal friction angle. With an increase in cement content, strength values were measured to increase because of the improvement in both internal friction angle and cohesion parameters. Additionally, start of decrease in strength values due to the sulphate attack was found be postponded as another advantage of the increase in cement content. Çimentolu Macun Dolgu Malzemelerinin Makaslama Dayanımı Üzerine Deneysel Bir ÇalışmaAnahtar Kelimeler Makaslama dayanımı, Mekanik parametreler, Çimentolu macun dolgu, Maden dolgusu, Yeraltı madenleri Özet: Bu çalışmada, çimento miktarı ve kür süresinin madencilikte kullanılan çimentolu macun dolgu malzemelerinin kohezyon ve içsel sürtünme açısı değerleri üzerindeki etkileri bir dizi deneysel çalışma ile incelenmiştir. Macun dolgu malzemelerinin yenilme özelliklerinin belirlenmesi için makaslama ve tek eksenli sıkışma dayanımı testleri gerçekleştirilmiştir. Elde edilen sonuçlara göre, MohrCoulomb yenilme ölçütünün çimentolu macun dolgu malzemeleri için kullanımına yönelik yeni bir katsayının kullanımı önerilmiştir. Çalışmanın önemli çıktılarından bir diğeri olarak, kür süresinin artışı neticesinde dayanım değerlerindeki iyileşmenin içsel sürtünme açısı nedeni ile değil, baskın olarak kohezyon değerlerindeki artıştan kaynaklandığı belirlenmiştir. Çimento miktarındaki artış sebebi ile hem içsel sürtünme açısı hem de kohezyon değerlerinde artış olduğu görülmüştür. Ayrıca, sülfat atak kaynaklı dayanım değerlerindeki azalmanın çimento miktarındaki artış neticesinde gecikerek daha uzun kür sürelerinde yaşandığı belirlenmiştir.

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Section: Discussionmentioning

confidence: 99%

An Experimental Study on Shear Strength of Cemented Paste Backfill Materials

Komurlu¹,

Turan²,

Cihangir³

et al. 2017

SDÜ Fen Bil Enst Der

View full text Add to dashboard Cite

show abstract

“…Some physical techniques have been used for evaluating the quality and predicting the strength of cementitious materials such as concrete, cement paste backfill (CPB), and soilcrete. Nondestructive techniques (NDTs) were used for estimating the strength of CPB . Cheng et al characterized the geometry and quality of soilcrete by acoustic tomography technology .…”

Section: Introductionmentioning

confidence: 99%

“…Nondestructive techniques (NDTs) were used for estimating the strength of CPB. [18][19][20] Cheng et al characterized the geometry and quality of soilcrete by acoustic tomography technology. 21,22 Pereira et al assessed the compressive strength and variability of concrete using ultrasonic testing.…”

Section: Introductionmentioning

confidence: 99%

Optimized neural network using beetle antennae search for predicting the unconfined compressive strength of jet grouting coalcretes

Sun

Zhang

et al. 2019

Num Anal Meth Geomechanics

141

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Summary This investigation studied the coalcrete, a new supporting material produced by jet grouting (JG) for supporting surrounding coal seams. For support design, the unconfined compressive strength (UCS) of the coalcrete is an essential parameter to evaluate the jet grouting effect in coal mines. In this study, an intelligent technique was proposed for predicting the UCS of the coalcrete by combining back propagation neural network (BPNN) and beetle antennae search (BAS). The architecture of BPNN was first tuned by BAS, and then, the optimized BPNN‐BAS model was subsequently used for nonlinear relationship modeling. Several crucial influencing variables including water‐cement ratio, coal‐grout ratio, and curing time were selected as the inputs. By combining these variables, 360 coalcrete samples were prepared in a controlled laboratory environment and tested for establishing the dataset. The results demonstrate that BAS can tune the BPNN architecture more efficiently compared with random selection. Moreover, in comparison with multiple regression (MLR) and logistic regression (LR), and support vector machine (SVM), the optimized BPNN‐BAS model is more reliable and accurate for predicting coalcrete strength. Sensitivity analysis (SA) was used to obtain the variable importance, and the results demonstrate that curing time affects the UCS of the coalcrete most strongly, followed by water‐cement ratio and coal‐grout ratio. The success of this study provides an accurate and brief approach to coalcrete strength prediction.

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“…Yilmaz et al [32,33] observed that longer curing time and lower water-to-cement (w/c) ratio result in lower total porosity and higher UCS. The UCS and ultrasonic pulse velocity of CPB increase with increasing binder dosage and reduce with the w/c ratio regardless of sample size and tailings type [34]. Huang et al [35] examined the effect of cement content, curing time and strain rate on the dynamic strength of CPB.…”

Section: Introductionmentioning

confidence: 99%

Strength Characteristics and Failure Mechanism of Cemented Super-Fine Unclassified Tailings Backfill

et al. 2017

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This experimental study investigates the strength characteristics of cemented super-fine unclassified tailings backfill (CSUTB) and its failure mechanism. Physical and chemical properties of tailings from the Zhongguan Iron Mine (ZGIM) were tested. A series of uniaxial compressive strength (UCS) tests was conducted to determine the relationships between UCS of CSUTB and three factors of cement-tailings ratio (CTR), solid content and curing time. Gray relational analysis (GRA) method was then used to study the sensitivity of UCS to these three factors. Results indicate that ZGIM unclassified tailings is a kind of alkaline super-fine tailings with high activity and quality. UCS of CSUTB increases exponentially with the increase of CTR and solid content, and increases linearly with curing time. The curing time is the most important factor for the UCS of CSUTB, followed by CTR and solid content. The stress-strain curves obtained from UCS tests show the failure process of CSUTB, including four stages of initial deformation, linear elastic, yield deformation and complete failure. It is the result of damage evolution.

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Strength and ultrasonic properties of cemented paste backfill

Cited by 107 publications

References 33 publications

An Experimental Study on Shear Strength of Cemented Paste Backfill Materials

An Experimental Study on Shear Strength of Cemented Paste Backfill Materials

Optimized neural network using beetle antennae search for predicting the unconfined compressive strength of jet grouting coalcretes

Strength Characteristics and Failure Mechanism of Cemented Super-Fine Unclassified Tailings Backfill

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