scholarly journals INVESTIGATION OF THE EFFECT OF THE ASH MINERAL ADDITIVES ON CEMENT QUALITY INDICATORS

2020 ◽  
Vol 2020 (1) ◽  
pp. 77-78
Author(s):  
Mihail Fereferov ◽  
Elena Kadyrova
Keyword(s):  
Fly Ash ◽  
Quality Indicators ◽  
Solid Fuel ◽  
Mineral Additive ◽  
Mineral Additives

The report presents the results of a study of the possibility of replacing the mineral additive ‒ fly ash, formed during the combustion of solid fuel, with ash from ash dumps. It is shown that such a replacement is quite possible and does not significantly affect the quality of cement.

Fly ash from Coal-Combustion Waste as an Additive for Quality Improvement and Compressive Strength of Cement

2021 ◽  
Vol 27 (1) ◽  
pp. 127-134
Author(s):  
Roni Adi Wijaya ◽  
Yayuk Astuti ◽  
Septi Wijayanti
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Coal Combustion ◽  
National Standard ◽  
Insoluble Residue ◽  
Chemical Components ◽  
Free Lime ◽  
Mineral Additive ◽  
Additional Mineral

A series of tests were carried out to determine the effect of the addition of coal combustion fly ash as an additional mineral (additive) on improving the quality and compressive strength of cement according to the Indonesian National Standard (SNI 15-2049-2004). Research methods include sample preparation, manufacture of cement with 0%, 5%, 8%, 12%, and 15% fly ash variations, chemical and physical properties of cement. The parameters measured were the level of chemical composition (%) using X-Ray Fluorescence Spectroscopy (XRF) ARL 9800 OASIS, free lime content (%) by volumetry, insoluble residue level (%) by gravimetry, compressive strength (kg/cm2), and smoothness cement (cm2/g). The results showed that the addition of fly ash increased the SiO2 content of cement, thereby increasing C3S and C2S compounds which are compressive strength components of a cement. Besides, the addition of fly ash is directly proportional to IR levels, compressive strength, smoothness, and inversely proportional to free lime levels. So the addition of fly ash can improve the quality of cement by increasing chemical components, increasing compressive strength, and reducing cracking or expansion of cement.

scholarly journals Determining the influence of protein-mineral additives on the properties of butter cookies emulsion

2021 ◽  
Vol 4 (11(112)) ◽  
pp. 42-49
Author(s):  
Maksym Serik ◽  
Olga Samokhvalova ◽  
Iryna Kholobtseva ◽  
Natalia Fedak ◽  
Olena Bolkhovitina ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Positive Influence ◽  
Model Systems ◽  
Chondroitin Sulfates ◽  
Technological Characteristics ◽  
Emulsification Capacity ◽  
Mineral Additive ◽  
Calcium Compounds ◽  
Mineral Additives

This paper reports the results of studying the influence of two types of protein-mineral additives on the properties of butter biscuit emulsion. The additives are considered as a source of digestible calcium compounds and as a functional and technological component that can improve the quality of buttery flour products. The parameters for pre-hydration of additives in the environment of cow's milk for better implementation of their functional and technological characteristics have been substantiated. It was established that the use of protein-mineral additives in the manufacture of emulsions in the amount of up to 7 % leads to an increase in the emulsification capacity of model systems by 1.5...1.65 times. Improved emulsion resistance has been proven, in particular after heat treatment. It was established that using 5...7 % of the additive produces a pronounced thermal stabilizing effect. After heat treatment at a temperature of 90...95 °C during 3×60 s, when using the protein-mineral additive, a volume of the released water and fat phase increases by 12...25 %. When applying the improved additive, a volume of the released phases increases by 3...10 %. A lower degree of coalescence of the fat phase as part of the emulsion when using the improved protein-mineral additive was microscopically confirmed. The fact of increasing the effective viscosity of emulsions when using up to 7 % of the improved protein-mineral additive was established. This is a positive fact in terms of stabilizing the emulsions and improving their stability as one of the important factors related to the quality of finished flour confectionery. It was established that the improved form of the additive, due to the content of chondroitin sulfates, provides for a better effect on the characteristics of emulsions, which should have a positive influence on the quality of flour-based buttery products.

scholarly journals Effect of modifiers and mineral additives from industrial waste on the quality of aerated concrete products

Technobius ◽  
2021 ◽  
Vol 1 (4) ◽  
pp. 0010
Author(s):  
Yerlan Sabitov ◽  
Duman Dyussembinov ◽  
Daniyar Bazarbayev
Keyword(s):  
Fly Ash ◽  
Polyvinyl Acetate ◽  
Raw Materials ◽  
Capillary Suction ◽  
Pulsation Apparatus ◽  
Rotary Pulsation Apparatus ◽  
Aerated Concrete ◽  
The Given ◽  
Mineral Additives

The given article is devoted to research of influence of polymer modifiers and mineral additives on quality of composite aerated concrete products. When selecting the composition of composite aerated concrete local raw materials and components were used: portland cement, sand, aluminum powder, polyvinyl acetate, fly ash, post-alcoholic bard and whey of milk. Preliminary polyvinyl acetate was combined with binder mixing water at a temperature above 55ºC to obtain a readily soluble polymer emulsion. Dispersion was carried out with a rotary-pulsation apparatus at a pressure of 0.5-1.0 MPa and a rotor speed of ~1200 rpm. In the same apparatus the complex modifier was produced. The offered technology of production of a complex modifier seems to be the most effective for composite aerated concrete. It made it possible to reduce water absorption and capillary suction of composite aerated concrete by an average of 25% and 45%, respectively. Moreover, different combinations of fly ash, polymer and modifier made it possible to achieve optimal values of thermal conductivity, compressive strength and frost resistance of composite aerated concrete.

Effects of Mineral Additives on Cold Recycled Foamed Asphalt Mixtures Cured in Laboratory and Field Conditions

2018 ◽  
Vol 2672 (26) ◽  
pp. 134-143 ◽  
Author(s):  
Wangyu Ma ◽  
Randy C. West ◽  
Nam Tran ◽  
Brian K. Diefenderfer ◽  
Chen Chen
Keyword(s):  
Fly Ash ◽  
Hydrated Lime ◽  
Asphalt Mixtures ◽  
Pavement Rehabilitation ◽  
Curing Conditions ◽  
Foamed Asphalt ◽  
Mineral Additive ◽  
Simulated Condition ◽  
Cold Recycling ◽  
Mineral Additives

Cold recycling with foamed asphalt has been considered a sustainable pavement rehabilitation technology. During the mix design process, the dry and wet indirect tensile strengths (ITS) and tensile strength ratio (TSR) are important parameters for evaluating performance of a cold mix. These performance parameters can be significantly influenced by the type of mineral additive used in the mixture and conditions in which test specimens are cured before testing. In this study, the objective was to determine the effects of mineral additives on the dry and wet ITS and TSR results of the cold recycled foamed asphalt mixtures in laboratory- and field-curing conditions. Mixtures with four different additives (cement, hydrated lime, baghouse fines, and Class C fly ash) at varied contents were compared to a control mixture without a mineral additive. Specimens were cured in the laboratory and in a field-simulated condition. The results from laboratory curing show that cement and hydrated lime improved both the dry and wet ITS results. Baghouse fines increased the dry ITS but not the wet ITS, while the fly ash only enhanced the wet ITS. Higher additive contents did not improve dry or wet ITS results, except for cement. The field-simulated curing results show all the additives improved the dry ITS over long periods of time but were not effective in the short term. The ITS results from long-term field-simulated curing and laboratory curing ranked these mixtures similarly. Confinement during curing did not have a significant effect on the dry ITS.

scholarly journals Effect of plasticizers, superplasticizers and silica fly ash on concrete water-resistance

2016 ◽  
Vol 7 (3) ◽  
pp. 33-38
Author(s):  
Mohamed Ahmad
Keyword(s):  
Fly Ash ◽  
Water Resistance ◽  
Construction Materials ◽  
Poor Quality ◽  
Laboratory Research ◽  
Hardened Concrete ◽  
Fine Aggregate ◽  
Mineral Additive ◽  
The Impact ◽  
Mineral Additives

Concrete is one of the basic construction materials. It is a composite made of cement, water, coarse and fine aggregate. In the past, concrete was produced only with primary components, and it was often of poor quality. Nowadays, technological progress and scientific research allowed the concrete to be made with the use of chemical admixtures and mineral additives to modify and improve selected properties of both the concrete mixture and hardened concrete. Contrary to popular belief, obtaining concrete with suitable properties is not simple and the choice of mixture components requires professional knowledge. The care and quality is also extremely important. The paper presents the results of laboratory research concerning the impact of the plasticizer admixture—Betocrete-C17 and superplasticizer—Arpoment-O and mineral additive of silica fly ash on concrete water resistance. Capillarity, water permeability and water absorption of the concrete were determined. Additionally, a study of the consistency of fresh mixture was done and the hardened concrete compressive strength was tested.

scholarly journals COMPOSITE BINDER WITH MINERAL ADDITIVES FOR NON-AUTOCLAVE FOAM CONCRETE

2019 ◽  
Vol 4 (4) ◽  
pp. 122-131 ◽  
Author(s):  
Д. Нецвет ◽  
Dar'ya Necvet ◽  
В. Нелюбова ◽  
Viktoriya Nelyubova ◽  
В. Строкова ◽  
...  
Keyword(s):  
Calcium Sulphate ◽  
Point Of View ◽  
Foam Concrete ◽  
Composite Binder ◽  
Combined Use ◽  
Mineral Additive ◽  
Mineral Components ◽  
Increased Strength ◽  
Mineral Additives

The possibility of increasing efficiency of non-autoclaved foam concrete due to the use of complex binder with mineral components of different composition has been theoretically substantiated and experimentally confirmed. The opportunity to use the anhydrous calcium sulphate as a modifying component of the mixture is proved, which accelerates the setting of the mixture. This allows to "fix" the structure of the aerated concrete mixture with minimal shrinkage deformations. It is shown that the combined use of anhydrite and a mineral additive in the form of a quartz suspension obtained by grinding sand in an aqueous medium leads to a liquefaction of the mixture, which is associated with a decrease in the share of the structure-forming component. From a technological point of view, this will allow obtaining materials with a rational pore structure by optimizing the processes of pores formation. Composite binder with mineral additives is characterized by increased strength with a reduced share of clinker component in comparison with cement. In result, the minimization of shrinkable deformations and improvement of the quality of cellular concrete are ensured

Criteria for evaluation of the coordinate measurements quality of parts geometric parameters at pilot-experimental production

2019 ◽  
pp. 3-8
Author(s):  
N.Yu. Bobrovskaya ◽  
M.F. Danilov
Keyword(s):  
Quality Indicators ◽  
Quality Management System ◽  
Technical Specification ◽  
Experimental Production ◽  
Technological Heredity ◽  
Coordinate Measurements ◽  
Reasonable Choice ◽  
The Stability ◽  
Geometric Elements

The criteria of the coordinate measurements quality at pilot-experimental production based on contemporary methods of quality management system and traditional methods of the measurements quality in Metrology are considered. As an additional criterion for quality of measurements, their duration is proposed. Analyzing the problem of assessing the quality of measurements, the authors pay particular attention to the role of technological heredity in the analysis of the sources of uncertainty of coordinate measurements, including not only the process of manufacturing the part, but all stages of the development of design and technological documentation. Along with such criteria as the degree of confidence in the results of measurements; the accuracy, convergence, reproducibility and speed of the results must take into account the correctness of technical specification, and such characteristics of the shape of the geometric elements to be controlled, such as flatness, roundness, cylindrical. It is noted that one of the main methods to reduce the uncertainty of coordinate measurements is to reduce the uncertainty in the initial data and measurement conditions, as well as to increase the stability of the tasks due to the reasonable choice of the basic geometric elements (measuring bases) of the part. A prerequisite for obtaining reliable quality indicators is a quantitative assessment of the conditions and organization of the measurement process. To plan and normalize the time of measurements, the authors propose to use analytical formulas, on the basis of which it is possible to perform quantitative analysis and optimization of quality indicators, including the speed of measurements.

Using the alveograph in developing requirements for the quality of flour for wafer sheet production

2020 ◽  
Vol 29 (12) ◽  
pp. 52-58
Author(s):  
E.P. Meleshkina ◽  
◽  
S.N. Kolomiets ◽  
A.S. Cheskidova ◽  
◽  
...  
Keyword(s):  
Rheological Properties ◽  
Quality Indicators ◽  
Wheat Flour ◽  
Mathematical Statistics ◽  
Intended Purpose ◽  
The Future ◽  
Relationship Of ◽  
The Relationship

Objectively and reliably determined indicators of rheological properties of the dough were identified using the alveograph device to create a system of classifications of wheat and flour from it for the intended purpose in the future. The analysis of the relationship of standardized quality indicators, as well as newly developed indicators for identifying them, differentiating the quality of wheat flour for the intended purpose, i.e. for finished products. To do this, we use mathematical statistics methods.

The impact of sex, gender and healthcare system on quality of care among young adults with acute myocardial infarction

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
V Raparelli ◽  
L Pilote ◽  
H Behlouli ◽  
J Dziura ◽  
H Bueno ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Young Adults ◽  
Quality Of Care ◽  
Healthcare System ◽  
Quality Indicators ◽  
Funding Source ◽  
Post Discharge ◽  
Single Payer

Abstract Background The quality of care among young adults with acute myocardial infarction (AMI) may be related to biological sex, psycho-socio-cultural (gender) determinants or healthcare system-level factors. Purpose To examine whether sex, gender, and the type of healthcare system influence the quality of AMI care among young adults. Methods A total of 4,564 AMI young adults (<55 years) (59% women, 47 years, 66% US) were analyzed from the VIRGO and GENESIS-PRAXY studies consisting of single-payer (Canada, Spain) versus multipayer (US) systems. For each patient treated in each system we calculated a quality of care score (QCS) for pre-AMI (1-year pre admission), in-hospital, and post-AMI (1-year post discharge) phases of care (number of quality indicators received divided by the total number [range=0–100%], with higher scores indicating better quality). Ordinal logistic or linear regression models, and 2-way interactions between sex, gender and healthcare system were tested. Results Women in the multipayer system had the highest risk factor burden. Across the phases of care for AMI, 20% of quality indicators were missed in both sexes. High stress, earner status, and social support were associated with a higher QCS in the pre-AMI phase, whereas only employment and earner status were associated with QCS in all other phases. In the pre-AMI phase, women had higher QCS than men, mainly in the single-payer system (adjusted-OR=1.85, 95% CI 1.46,2.35 vs. 1.07, 95% CI 0.84,1.36, P-interaction= 0.002). Regardless of sex, only employment status had a greater effect in the multipayer system (adjusted-OR=0.59, 95% CI 0.44,0.78 vs 1.13, 95% CI 0.89,1.44, P-interaction <0.001). In the in-hospital phase, women had a lower QCS than men, especially in the multipayer system (adjusted-mean-difference: −2.48, 95% CI-3.87, −1.08). Employment was associated with a higher QCS (2.0, 95% CI 0.9–3.17, P-interaction >0.05). Finally, in the post-AMI phase, men and women had a lower QCS, predominantly in the multipayer system. However, primary earners had higher QCS regardless of system. Conclusion Sex, gender, and healthcare system affected the quality of care after AMI. Women had a poorer in-hospital than men and both women and men had suboptimal post-discharge care. Being unemployed lowered the quality of care, more so in the multipayer system. Funding Acknowledgement Type of funding source: Public grant(s) – National budget only. Main funding source(s): Canadian Institutes of Health and Research (CIHR)

scholarly journals Quality in Assisted Living: Does It Lie in the Eyes of the Beholder?

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 726-727
Author(s):  
Diana White ◽  
Tunalilar Ozcan ◽  
Serena Hasworth ◽  
Jaclyn Winfree
Keyword(s):  
Quality Indicators ◽  
Residential Care ◽  
Assisted Living ◽  
Physical Environment ◽  
Sampling Strategy ◽  
Perceived Quality ◽  
Two Stage ◽  
Regulatory Perspective ◽  
To Receive

Abstract Quality is defined in multiple ways and by different stakeholders (e.g., residents, regulators, informed observers). Using a two-stage stratified sampling strategy, we collected data from N=241 residents living in 31 assisted living and residential care communities (AL/RC) in Oregon. Residents rated their overall satisfaction and satisfaction with the AL/RC as a place to live and to receive care. Each interviewer completed a facility profile summarizing their observations about the setting, including quality of staff-resident interactions and physical environment. Residents and interviewers were also asked whether they would recommend the community to others. Finally, we used deficiency citations given during regular inspections by the licensing agency to proxy regulatory perspective. Results show that perceived quality varied by stakeholder (e.g., residents’ assessments differed from deficiency citations). Given this variation, findings suggest that efforts to make quality indicators publicly available should include multiple measures and perspectives, especially residents.

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