Effect of the Content of Micro-Active Copper Tailing on the Strength and Pore Structure of Cementitious Materials

Zhang, Liming; Liu, Songbai; Song, Dongsheng

doi:10.3390/ma12111861

Cited by 8 publications

(3 citation statements)

References 18 publications

(14 reference statements)

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“…The results showed that the fine tailing has a specific surface area value of 540 m 2 /kg, which reflects the high fineness against the 139 m 2 /kg belonging to the coarse tailing. The value of fine tailing is close to the specific surface area of the copper tailing obtained from the ball mill [70]. At the same time, the significant variations between fine and coarse tailings agree with the physical properties of both materials as the D50 of fine tailing achieved 10 μm; meanwhile, coarse tailing exhibited 240 μm for D50.…”

Section: Specific Surface Areasupporting

confidence: 81%

Eco-Sustainable Recycling of Cement Kiln Dust (CKD) and Copper Tailings (CT) in the Cemented Paste Backfill

2023

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Cement global demand shows continued growth and a significant increase in the production volume, which may negatively impact the non-renewable natural resources and the environment, which is incompatible with sustainability goals. Cement kiln dust (CKD) is a primary concern associated with clinker manufacturing as a waste byproduct. Similarly, the mining industry produces copper tailing as unwanted material while beneficiating the ore, creating environmental problems due to difficulty in managing worldwide generated quantities that reach billions of metric tons. This study investigated the beneficial utilization of cement kiln dust and copper tailing as undesirable wastes in industrial applications through underground mines’ cemented paste backfill (CPB). Sixty different mixtures were prepared with three types of CKD collected from various cement manufacturers and were accordingly used with a proportion of 5, 10, and 15% to partially replace ordinary Portland cement (OPC) and pozzolan Portland cement (PPC) binders, represented in hundreds of CPB samples. The hardened specimens were subjected to density, uniaxial compressive strength (UCS), and axial deformation measurements to evaluate the physical and mechanical properties at curing up to 90 days. Meanwhile, X-ray powder diffraction (XRD) was extensively applied to chemically investigate the hydration products of CPB-hardened mixtures. Moreover, we developed a UCS predictive model applying two techniques: multiple variables regression analysis and artificial neural network (ANN). The results showed that the tricalcium silicate (Alite) and dicalcium silicate (Belite) phases form C-S-H upon hydrations and provide high strength in the binary mixtures. Meanwhile, the CKD’s lime saturation factor (LSF) governed the strength value in the ternary mixtures that utilized copper tailings. That makes CKD practical in the CPB mixture when partially replacing the OPC and PPC binders, with a proportion of up to 15%. In addition, the ANN technique’s predictive model exhibited a significant positive correlation with excellent statistical parameters that achieved 0.995, 0.065, and 0.911 for R2, RMSE, and MAE, respectively.

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Section: Specific Surface Areasupporting

confidence: 81%

Eco-Sustainable Recycling of Cement Kiln Dust (CKD) and Copper Tailings (CT) in the Cemented Paste Backfill

2023

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“…Hasil ini sinkron dengan hasil pengujian dari porositas mortar, dimana MT-10 memiliki nilai kadar rongga terbesar. Hal ini dikemukakan juga dalam penelitian pada referensi [13] dimana berdasarkan analisa Scanning Electron Microscopy (SEM) diperoleh bahwa pengaruh tailing tidak signifikan sebagai filler pada umur awal dan akan lebih maksimal ketika umur benda uji di atas 180 hari. 3.…”

Section: Absorpsiunclassified

Pengaruh pemanfaatan tailing terhadap kuat tekan, porositas dan absorpsi mortar Portland Composite Cement

Supit

Rumbayan

Misilu

2019

JTST

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Potensi tailing sebagai material konstruksi pengganti sebagian semen untuk aplikasi masonry diuji dalam penelitian ini berdasarkan hasil kuat tekan dan porositas mortar. Tailing yang diambil dari lokasi penambangan emas tradisional di Desa Kotabunan Kabupaten Bolaang Mongondow Timur, Provinsi Sulawesi Utara, digunakan untuk mengganti 5%, 10%, dan 15% semen pada campuran mortar (MT-5, MT-10 dan MT-15) dan diuji pada hari ke-7, 14 dan 28 hari setelah perendaman dengan air. Hasil yang diperoleh menunjukkan bahwa nilai kuat tekan mortar dengan campuran 10% tailing dari berat semen (MT-10) memiliki nilai tertinggi dibandingkan kuat tekan mortar dengan campuran tailing 5% dan 15%. Kuat tekan yang diperoleh adalah 10 MPa, 17 MPa dan 19 MPa pada semua tinjauan umur mortar. Adapun hasil ini tidak memiliki perbedaan yang berarti dibandingkan dengan kuat tekan mortar normal tanpa tailing (MT-0) khususnya pada umur awal mortar yakni 7 dan 14 hari. Pengujian porositas menunjukkan bahwa MT-15 memberikan nilai porositas lebih rendah dibandingkan MT-5 dan MT-10 namun sedikit lebih besar dari MT-0. Dari hasil perbandingan MT-0 dengan MT-10, ketahanan mortar dengan 10% tailing terhadap absorpsi adalah lebih besar dari MT-0 sehingga masih perlu dilakukan kajian lanjutan dalam pengujian durabilitas mortar dengan tailing untuk aplikasi konstruksi pada lingkungan yang korosif.

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“…A negative exponential relationship between the porosity of the CPB and UCS was also proposed. Zhang et al [22] prepared a cement paste containing copper tailings (CPCT) and studied the effects of the copper tailings dosage and curing age on the porosity of the slurry; they concluded that the microstructure became increasingly compact with increasing age and copper tailings consumption. Wu et al [23,24] prepared cemented coal gangue-fly ash backfill (CGFB) using coal gangue, fly ash (FA) and ordinary Portland cement (OPC) as constituent materials; they analyzed the effect mechanism of multi-field coupling on the performance of CGFB and concluded that increasing the OPC/FA ratio and curing temperature could accelerate the hydration reaction and obtain higher compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a New Type of Cemented Paste Backfill with an Alkali-Activated Silica Fume and Slag Composite Binder

Sun

2020

Materials

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A new type of cemented paste backfill (CPB) was prepared using sodium hydroxide (NaOH) as the activator, slag and silica fume (SF) as the binder, and tailings as the aggregate. The effects of proportion of replacement of 0%, 5%, 10%, 15%, and 20% silica fume on the properties of CPB were studied. The strength formation mechanism of CPB was explored through a combination of scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and Fourier transform infrared (FTIR) spectroscopy. The SEM images were analyzed by IMAGE J software, and the porosity of CPB with different silica fume contents was obtained. The results show that as the amount of silica fume increases, the unconfined compressive strength (UCS) increases first and then decreases. When the amount of silica fume was approximately 5%, CPB with a larger UCS can be obtained. When the silica fume content increased from 0% to 5%, because silica fume has good activity and small particles, more calcium silicate hydrate (C–S–H) gels and Mg-Al type layered double hydrotalcites (LDHs) were generated in CPB, which made it denser and improved its strength compared with the non-silica fume group. C–S–H gels were the main source of CPB strength. With a further increase in the amount of silica fume, thaumasite produced inside of CPB, reducing the content of C–S–H gels. Moreover, due to the expansion of thaumasite, it is easy to generate a large number of micro cracks in CPB, which weakens the strength of CPB.

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Effect of the Content of Micro-Active Copper Tailing on the Strength and Pore Structure of Cementitious Materials

Cited by 8 publications

References 18 publications

Eco-Sustainable Recycling of Cement Kiln Dust (CKD) and Copper Tailings (CT) in the Cemented Paste Backfill

Eco-Sustainable Recycling of Cement Kiln Dust (CKD) and Copper Tailings (CT) in the Cemented Paste Backfill

Pengaruh pemanfaatan tailing terhadap kuat tekan, porositas dan absorpsi mortar Portland Composite Cement

Preparation of a New Type of Cemented Paste Backfill with an Alkali-Activated Silica Fume and Slag Composite Binder

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