The impacts of nano-SiO2 and silica fume on cement kiln dust treated soil as a sustainable cement-free stabilizer

2021 ◽  
Vol 285 ◽  
pp. 122918
Author(s):  
Sadegh Ghavami ◽  
Hamed Naseri ◽  
Hamid Jahanbakhsh ◽  
Fereidoon Moghadas Nejad
Keyword(s):  
Silica Fume ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Treated Soil ◽  
Nano Sio2 ◽  
Kiln Dust

scholarly journals Evaluating the Durability of Green Cement Mortar Using Ultrasonic Pulse Velocity

2021 ◽  
Vol 877 (1) ◽  
pp. 012049
Author(s):  
Ali Abdulridha ◽  
Saif S. AlQuzweeni ◽  
Rasha S. AlKizwini ◽  
Zahra A. Saleh ◽  
K. S. Hashem
Keyword(s):  
Silica Fume ◽  
Cement Mortar ◽  
Experimental Studies ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Negative Consequences ◽  
Kiln Dust

Abstract Various experimental studies have highlighted the negative consequences of Portland cement on health and the environment, such as toxic emissions and alkaline sewage. The development of environmentally acceptable substitutes for cement is thus one of the objectives of current investigations. The proposed environmental alternatives to cement, nevertheless, might have detrimental impacts on the concrete’s characteristics. This investigation intends to study the suitability as alternatives to cement in cement mortar, using industrial wastes like silica fume and cement kiln dust. As a replacement for cement, the cement mortars developed in this research continue from 0% to 60% silica fume and cement kiln dust. Ultrasonic pulse velocity tests at 1 to 4 weeks of age were conducted on hardened specimens. The findings showed that a low reduction in the pulse velocity resulted from high proportions of silica fume and cement kiln dust replacements, whereas an improvement in the characteristics of the mortars with low replacement ratios. Using low kiln dust and silica fume of 20 to 40%, the durability of mortars may increase.

scholarly journals Stabilization/Solidification (S/S) Pb and W Contaminated Soils using Type I/II Portland Cement, Silica Fume Cement and Cement Kiln Dust

2013 ◽  
Vol 11 (3) ◽  
pp. 267-282
Keyword(s):  
Silica Fume ◽  
Soil Type ◽  
Contaminated Soils ◽  
Dry Weight ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Lead Silicate ◽  
Type I ◽  
Curing Time ◽  
Kiln Dust

Stabilization/solidification (S/S) processes were utilized to immobilize lead (Pb) and tungsten (W) in contaminated soils, the inclusion of W motivated by the use of the new W-based ammunition. Artificially contaminated soils were prepared by mixing either kaolinite or montmorillonite with 10% Pb and 1% W (all percentages by dry weight). Type I/II Portland cement (PC), silica fume cement (SFC) and cement kiln dust (CKD) were used as S/S agents. The S/S agents were added at 5, 10 and 15 % for a curing time of 1-, 7- and 28-days. The toxicity characteristic leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) were used to evaluate the effectiveness of the treatments. X-ray powder diffraction (XRPD) was used to investigate the crystalline mineral phases responsible for Pb and W immobilization. The TCLP results showed that regardless of clay type and stabilizing agents, the Pb concentrations decreased with increasing pozzolan content. PC and SFC exhibited similar performance depending on the particular sample (not consistent with soil type, dosage, and curing time). The most effective stabilizing agent on Pb leachability was PC despite SFC being silica-enriched which should have contributed to its greater immobilization of Pb. TCLP-W was immobilized below 1 mg l-1 in every case. The most effective stabilizing agent on the SPLP-Pb leachability was CKD, consistently demonstrating among the lowest concentrations for each soil type due to pH control. PC and SFC exhibited similar performance depending on the particular sample (not consistent with soil type, dosage, and curing time). The W concentrations in SPLP leachate were very low in most samples indicating that W could be immobilized upon S/S processes even though W solubility is very high at elevated pH conditions (662.9 mg l-1 at pH~11), and would remain immobilized under SPLP exposure conditions. The XRPD results revealed that the formation of lead silicate (Pb4SiO6), stolzite (PbWO4) and lead tungsten oxide (Pb0.29WO3) were strongly associated with the immobilization of Pb in the S/S matrix.

scholarly journals CHARACTERISTICS OF HARDENED CONCRETE INCORPORATING CEMENT KILN DUST (CKD) AND SILICA FUME (SF)

2020 ◽  
Vol 15 (54) ◽  
pp. 1-12
Author(s):  
Ahmed M. Abdullah ◽  
Rafik Abdelwahab ◽  
Arafa Elhelloty ◽  
Mohammed Nooman
Keyword(s):  
Silica Fume ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Hardened Concrete ◽  
Kiln Dust

scholarly journals Use of Cement Kiln Dust and Silica Fume as partial replacement for cement in concrete

2021 ◽  
Vol 877 (1) ◽  
pp. 012045
Author(s):  
Raid Hussian
Keyword(s):  
Silica Fume ◽  
Ultrasonic Pulse Velocity ◽  
Cementitious Materials ◽  
Pulse Velocity ◽  
Supplementary Cementitious Materials ◽  
Partial Replacement ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Concrete Mixtures ◽  
Kiln Dust

Abstract Cement is amongst the most polluting materials utilized in the building sector, contributing to a variety of hazardous pollutants, including greenhouse gas emissions. This raises health impacts related to the manufacture of cement. As a result, a substitute substance for conventional cement with low environmental effects and better building characteristics is required. The purpose of the study would be to look at the consequences of using supplementary cementitious materials (SCMS) to substitute cement in a concrete mix partially. This study employed silica fume (SF) and cement kiln dust (CKD) as supplementary cementitious materials. Several concrete mixtures were created by substituting cement by a combination of SF and CKD in three proportions which that 25%, 35%, and 45% within curing periods of (one week and four weeks); the concrete mixtures were tested. The ultrasonic pulse velocity (UPV) test has been used to investigate the concrete mixture’s strength in this study. The findings show that the optimal proportion of SF replacement cement and CKD involvement ranged from 25% to 35%. The pulse velocity of specimens improves when the proportion of CKD and SF increases to the optimal percentage, while the larger amounts of these by-products begin to lower the pulse velocity of specimens.

scholarly journals Tensile Performance Analysis of Ultra-Rapid-Hardening Fiber-Reinforced Concrete Based on Cement Kiln Dust Content

2020 ◽  
Vol 20 (5) ◽  
pp. 217-223
Author(s):  
Booki Chun ◽  
Wonsik Shin ◽  
Yun Sik Jang ◽  
Doo-Yeol Yoo
Keyword(s):  
Reinforced Concrete ◽  
Silica Fume ◽  
Fiber Reinforced Concrete ◽  
Limestone Powder ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Fiber Reinforced ◽  
Rapid Hardening ◽  
Tensile Performance ◽  
Kiln Dust

In this study, the effects of cement kiln dust and silica fume on the tensile performance of fiber-reinforced concrete mixtures comprising special materials and polyethylene fiber for the reinforcement of facilities were analyzed. For the purpose of repair, ultra-rapid-hardening cement with high C3A content was employed, and the cement was replaced with supplementary cementitious materials such as granulated ground blast furnace slag, limestone powder, cement kiln dust, and silica fume. Cement kiln dust was incorporated at 10%, 15%, 20%, 30%, 40%, and 50% weight of cement, and silica fume was incorporated at 20% and 40% weight of cement. Four hours after specimen fabrication, a direct tensile test was conducted. The obtained experimental results indicate that the tensile performance (including tensile strength, strain capacity, and energy dissipation capacity) is found to be significantly high when the content of silica fume is 20% and that of cement kiln dust is 15%.

scholarly journals Utilization of Cement Kiln Dust (CKD) with Silica Fume (SF) as a Partial Replacement of Cement in Concrete Production

2019 ◽  
Vol 07 (04) ◽  
pp. 137-149
Author(s):  
Arafa Elsayed Elhelloty ◽  
Mohammed Taha Nooman ◽  
Rafik Khairy Abdelwahab ◽  
Ahmed Islam Abdullah
Keyword(s):  
Silica Fume ◽  
Partial Replacement ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Concrete Production ◽  
Kiln Dust
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