Exploration of hydration and durability properties of ferroaluminate cement with compare to Portland cement

2022 ◽  
Vol 319 ◽  
pp. 126138
Author(s):  
Zirui Cheng ◽  
Jihui Zhao ◽  
Linyong Cui
Keyword(s):  
Portland Cement ◽  
Durability Properties

Possibilities of Processing of Slag Aggregate from Heap Koněv

2019 ◽  
Vol 292 ◽  
pp. 79-84
Author(s):  
Lukáš Procházka ◽  
Jana Boháčová
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Mechanical Parameters ◽  
Durability Properties ◽  
Subsequent Determination ◽  
Alkali Activated

The aim of this work is to find out whether the slag aggregates from heap Koněv can be used in hydraulic mixtures based on traditional Portland cement as well as in alternative binders based on alkali activated blast furnace slag.In the experiment the basic physical-mechanical parameters of prepared mixtures were determined and the durability properties of these composites were verified. The composition of the aggregate extract and its influence on the properties of the prepared mixtures and the subsequent determination of the alkaline ions in slag aggregates were also verified.

Physical, mechanical, and durability properties of gypsum–Portland cement–natural pozzolan blends

2001 ◽  
Vol 28 (3) ◽  
pp. 375-382 ◽  
Author(s):  
Adnan Çolak
Keyword(s):  
Portland Cement ◽  
Water Absorption ◽  
Setting Time ◽  
Strength Loss ◽  
Natural Pozzolan ◽  
Durability Properties ◽  
Gypsum Content ◽  
Mechanical Durability ◽  
Binder Ratio ◽  
Cement Binder

This paper deals with the effect of gypsum–Portland cement and gypsum–Portland cement–natural pozzolan ratios on the physical, mechanical, and durability properties of gypsum–Portland cement–natural pozzolan blends. The results indicate that the setting time of these paste decreases with the increase of gypsum content in the mixture, ranging from 8 to 11 min. The addition of superplasticizer increases the setting time from approximately 11 to 35 min. This increase is greatly dependent on the plasticizer admixture dosage. These blends show a kinetic of capillary water absorption very similar to that of the Portland cement binder. Sorptivity is strongly influenced by the type of binder, binder composition and water–binder ratio. Porosity of blended gypsum binders ranges from 12% to 37%. Their water absorption is high, reaching 27% in the blends with a greater proportion of gypsum. The gypsum–Portland cement blends themselves possess good water resistance, which is further enhanced by the addition of natural pozzolan and superplasticizer. The water-cured blends with the composition of 41:41:18 (gypsum : Portland cement : natural pozzolan) and 41:41:18S1 (gypsum : Portland cement : natural pozzolan : 1% superplasticizer) offer a compressive strength of approximately 20 MPa at room temperature. These blends give excellent properties retention after aging in water at 20°C for 95 days. Their good resistance to water decreases as the gypsum content in the mixture is raised. However, the strength loss for the gypsum–Portland cement–natural pozzolan blends is generally less than that observed for the gypsum binder.Key words: gypsum, Portland cement, natural pozzolan, physical, mechanical, durability.

scholarly journals Coal gasification ash and Weathered fly ash, as partial replacement of Portland cement – effect on selected durability properties of concrete

2018 ◽  
Vol 199 ◽  
pp. 02021
Author(s):  
Dikeledi Maboea ◽  
Mike Otieno
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Coal Gasification ◽  
Partial Replacement ◽  
Low Grade ◽  
Durability Properties ◽  
Cement Specimen

This study uses Sasol ashes as cement extenders to contribute to the technology of partially replacing Portland cement by mass. There are two types of Sasol ashes; coal gasification ash (CGA) and weathered fly ash (WFA) produced from low grade coal. These ashes are disposed of by Sasol with no specific utilisation. In this investigation, PC will be partially replaced by mass with WFA, CGA and FA at 10%, 15% and 30% proportions for each type of ash. The durability indices will be measured and compared for all blended specimen (PC/WFA, PC/CGA and PC/FA). A 100% Portland cement specimen will be used as a control. The durability properties will be used to determine the potential of Sasol ashes being used as a cement extender.

scholarly journals Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties

2019 ◽  
Vol 4 ◽  
pp. 89-102 ◽  
Author(s):  
Alice T Bakera ◽  
Mark G Alexander
Keyword(s):  
Portland Cement ◽  
Cementitious Material ◽  
Concrete Durability ◽  
Western Cape ◽  
Supplementary Cementitious Material ◽  
Durability Properties ◽  
Carbonation Resistance ◽  
Performance Results ◽  
Local Materials ◽  
Durability Performance

Numerous research efforts on metakaolin as a supplementary cementitious material (SCM) have been undertaken in the past 20 years. This material, while relatively expensive mainly due to low production volumes worldwide, nevertheless has a significantly lower production cost than Portland cement. However, industry remains tentative in considering metakaolin in concrete. This paper takes the view that industry should consider investing in the production and application of metakaolin in appropriate concrete projects, particularly in aggressive environments where plain Portland cement may be inadequate, and where other SCMs may not readily be available. The main contribution of the paper is a global review of recent studies on the use of metakaolin in different types of concrete. This international experience is then compared with results from a study on the durability performance of metakaolin concrete using local materials in the Western Cape province of South Africa, as a means of concrete performance improvement. The study investigates concrete durability properties: penetrability (sorptivity, permeability, conductivity and diffusion), mitigation of Alkali-Silica Reaction (ASR), and carbonation resistance. The concretes were prepared with three water-binder ratios (0.4, 0.5 and 0.6), and with metakaolin replacement levels of 0% (control), 10%, 15% and 20%. Performance results show that, with increasing metakaolin content, the transport properties of concrete are considerably improved, ASR expansion due to a highly reactive local aggregate decreases to non-deleterious levels, while no detrimental effect on carbonation is observed. Thus, metakaolin could serve as a valuable SCM to enhance the durability performance of concrete in local aggressive environments.

scholarly journals Role of Ground Glass Fiber as a Pozzolan in Portland Cement Concrete

2017 ◽  
Vol 2629 (1) ◽  
pp. 33-41 ◽  
Author(s):  
Hassan Rashidian-Dezfouli ◽  
Prasada Rao Rangaraju
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Glass Fiber ◽  
Chloride Ion ◽  
Ground Glass ◽  
Hardened Concrete ◽  
Portland Cement Concrete ◽  
Durability Properties ◽  
Class F Fly Ash ◽  
Class F

Millions of tons of fiberglass are produced annually for a variety of applications. Because of stringent quality requirements and operational characteristics of the manufacturing plants, a significant quantity of fiberglass that does not meet required specifications of the industry ends up as waste in landfills. This study investigated the use of ground glass fiber (GGF) that had been discarded by plants because it did not meet prescribed standards, as a supplementary cementitious material (SCM) for portland cement. Three replacement levels (10%, 20%, and 30% by mass) for portland cement in paste, mortar, and concrete mixtures were studied. Mechanical and durability properties of the mixtures were compared with two control mixtures: a mixture made up of 100% portland cement and a mixture with 25% Class F fly ash as a cement replacement material. It was observed in these studies that even though replacement of portland cement with GGF did not lead to any significant changes in the mechanical behavior of hardened concrete, there were significant improvements in durability properties at replacement levels up to as high as 20%. The use of GGF was found to improve significantly the resistance of mortar mixtures to alkali–silica reaction and sulfate attack. In addition, the use of GGF as an SCM significantly reduced the chloride ion permeability of concrete. Results of this study show that using GGF as an SCM can result in a better durability performance compared with a mixture with a similar level of Class F fly ash.

scholarly journals Effect of Micro Polypropylene Fibre on the Performance of Fly Ash-Based Geopolymer Concrete

2019 ◽  
Vol 9 (1) ◽  
pp. 97-108
Author(s):  
Manoj Rajak ◽  
Baboo Rai
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Mechanical Performance ◽  
Polypropylene Fibre ◽  
Fibre Reinforcement ◽  
Geopolymer Concrete ◽  
Split Tensile Strength ◽  
Polypropylene Fibres ◽  
Durability Properties ◽  
Geopolymer Composites

Abstract Geopolymer offers significant promise to the construction world as a possible alternative to ordinary Portland cement (OPC). Like conventional Portland cement concrete, the matrix brittleness in geopolymer composites can be reduced by introducing suitable fibre reinforcement. A few investigations on fibre reinforced geopolymer composites are available. However there is still a gap to comprehend and enhance their performance. This paper describes the effect of incorporating micro polypropylene fibres on the strength and durability characteristics of geopolymer concrete. The engineering and durability properties like workability, compressive strength, split tensile strength, flexural strength, modulus of elasticity, and sorptivity of geopolymer concrete reinforced with micro polypropylene fibres is presented. The effect of the sulfuric acid attack on Geopolymer Concrete reinforced with micro polypropylene fibres is also discussed. The results show that hydrophobic characteristics of the micro polypropylene fibre led to weak contact with the geopolymer binder and hence weakened the mechanical performance of the fly ash based geopolymer matrix. However significant improvements in durability properties were noted.

scholarly journals Physical, Mechanical and Durability Properties of Ecofriendly Ternary Concrete Made with Sugar Cane Bagasse Ash and Silica Fume

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1012
Author(s):  
Laura Landa-Ruiz ◽  
Aldo Landa-Gómez ◽  
José M. Mendoza-Rangel ◽  
Abigail Landa-Sánchez ◽  
Hilda Ariza-Figueroa ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Electrical Resistivity ◽  
Portland Cement ◽  
Physical Properties ◽  
Silica Fume ◽  
Sugar Cane ◽  
Sugar Cane Bagasse ◽  
Conventional Concrete ◽  
Durability Properties ◽  
Sugar Cane Bagasse Ash

In the present investigation, the physical, mechanical and durability properties of six concrete mixtures were evaluated, one of conventional concrete (CC) with 100% Portland cement (PC) and five mixtures of Ecofriendly Ternary Concrete (ETC) made with partial replacement of Portland Cement by combinations of sugar cane bagasse ash (SCBA) and silica fume (SF) at percentages of 10, 20, 30, 40 and 50%. The physical properties of slump, temperature, and unit weight were determined, as well as compressive strength, rebound number, and electrical resistivity as a durability parameter. All tests were carried out according to the ASTM and ONNCCE standards. The obtained results show that the physical properties of ETC concretes are very similar to those of conventional concrete, complying with the corresponding regulations. Compressive strength results of all ETC mixtures showed favorable performances, increasing with aging, presenting values similar to CC at 90 days and greater values at 180 days in the ETC-20 and ETC-30 mixtures. Electrical resistivity results indicated that the five ETC mixtures performed better than conventional concrete throughout the entire monitoring period, increasing in durability almost proportionally to the percentage of substitution of Portland cement by the SCBA–SF combination; the ETC mixture made with 40% replacement had the highest resistivity value, which represents the longest durability. The present electrical resistivity indicates that the durability of the five ETC concretes was greater than conventional concrete. The results show that it is feasible to use ETC, because it meets the standards of quality, mechanical resistance and durability, and offers a very significant and beneficial contribution to the environment due to the use of agro-industrial and industrial waste as partial substitutes up to 50% of CPC, which contributes to reduction in CO2 emissions due to the production of Portland cement, responsible for 8% of total emissions worldwide.

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