Polyvinyl alcohol pva is adopted from polyvinyl acetate, which is readily hydrolysed by treating an alcoholic. A thesis submitted for the fulfilment of the requirements for the degree of. The effect of polyvinyl alcohol functionalized multiwall carbon nanotubes on the improvement of the compressive strength of concrete. Polyvinyl alcohol, also known as pvoh, pva, or pval, is a synthetic polymer that is soluble in water. Mechanical properties of polyvinylalcohol modified concrete.
It is effective in film forming, emulsifying, and has an adhesive quality. Polyvinyl alcohol fibers download ebook pdf, epub, tuebl. In this paper, the effects of polyvinyl alcohol with different hydrolysis and polymerization degrees on the rheological properties of cement mortar are studied. Behavior of pva fiber concrete under freezing and thawing cycles fei xua, xiansong xieb. The influences of fiber types, size, dosages, and fiber combinations used in hybrid mixes on fresh slump flow, lbox passing ability, vfunnel flow. However, the exact in uence of bre length and volumetriccontent remains unknown. Polyvinyl alcohol is a water solution polymer derived from the hydrolysis of vinyl acetate.
Behavior of pva fiber concrete under freezing and thawing. The results have shown that pva increases the strength and decreases the porosity. Pva fibers were added to the concrete at a dosage of 0. The results revealed that compared with a control sample, the. The cement used was type v portland cement prepared from tehran cement company. The main uses are in the paper, adhesive, textile and construction industries, as well as in ceramics, packaging and electronics. Latexmodified concrete with rapid set cement but without fibers was also included since it is.
Although complete friction elimination is not possible by using any slick coating, the emphasis is. Study of mechanical properties of pva fiberreinforced. Pdf aggregate and rice husk ash with polyvinyl alcohol. Caco 3 particles on fresh and mechanical performance of concrete containing fly ash was assessed. Properties of polyvinyl alcohol cement pastes springerlink. Poly vinyl alcohol is cream coloured granular powder, has high flexibility and tensile strength. Kuraray poval features an extremely wideranging field of applications. This paper presents the results of an experimental study investigating the effect of uncoated polyvinyl alcohol pva fibres on the properties of hardened concrete. Pdf static mechanical properties of polyvinyl alcohol fibre. At the kuraray poval, we provide the best quality pva powder, pvoh etc. Effect of polyvinyl alcohol on hydration of fly ash.
Mechanical and structural properties of polyvinyl alcohol. Uhsc was designed and mixed to evaluate its static and dynamic mechanical properties in this study. The concrete quality of each group is shown in table 2, where group no. Second only to polyethylene among the plastics in production and consumption, pvc is used in an enormous range of domestic and industrial products, from raincoats and shower curtains to window frames and indoor plumbing. Fiber, matrix, and fibermatrix interfacial properties were tailored based on micromechanics models to satisfy the pseudo strainhardening condition. Kuraray poval is the brand name of kurarays globally produced polyvinyl alcohol pvoh. Ebook polyvinyl alcohol developments as pdf download. Mechanical and structural properties of polyvinyl alcohol fibre reinforced concrete pvafrc by amin noushini a thesis submitted for the fulfilment of the requirements for the degree of master of engineering school of civil and environmental engineering faculty of engineering and information technology university of technology sydney 20. The effect of polyvinyl alcohol functionalized multiwall. In order to study the flexural toughness of pva fiber reinforced concrete, employ the volume mixing ratio is 0. In this investigation, the combined influence of polyvinyl alcohol pva fibers and nano. Due to the materials superior compressive and flexural properties, the.
Experimental investigations are conduct to measure the workability, compressive strength, bending. Pdf compressive and flexural strength of polyvinyl. The mechanical properties of cement mortars with 02. Working mechanism of polyvinyl alcohol cement fluid loss. Pdf effect of polyvinyl alcohol pva fibre on dynamic and material. March 2014 the panel tabled approval of the summary of its action at the december 20 meeting. Pdf static mechanical properties of polyvinyl alcohol. This solution is a filmforming agent, which upon drying will form a release film. Enhancing the strength of pervious concrete by using poly. Kuraray poval, exceval, elvanol and mowiflex are the polyvinyl alcohol made by kuraray. Pdf this paper reports the results of experimental tests on polyvinylalcohol modified concrete. Polyvinyl alcohol pva is a kind of watersoluble polymer, which has been widely used in different industries due to its excellent mechanical and chemical properties.
Due to its weak thermal stability, water resistance and aging resistance, it is used together with thermosetting adhesive. Polyvinyl alcohol films were found to retard the hydration process, resulting in the delay in initial and final setting times of cementpva paste, therefore reducing the compressive strength of. Its flexural toughness properties were tested and the loaddeflection curve of all beams is obtained. Polyvinyl acetals are prepared by treating pva with aldehydes. This paper reports the results of experimental tests on polyvinylalcohol modified concrete. The mechanical properties, such as uniaxial compression strength and elastic modulus, and the influence of a crosslinking agent are investigated. Durability studies on polyvinyl alcohol fiber reinforced. Study of mechanical properties of pva fiberreinforced concrete with raman spectroscopic analysis.
Polyvinyl alcohol developments top results of your surfing polyvinyl alcohol developments start download portable document format pdf and ebooks electronic books free online rating news 20162017 is books that can provide inspiration, insight, knowledge to the reader. However, discussions were made based on studies on microstructure and molecular structure and it is proposed that calcium complexes formed by chemical interaction occupy the free place in the. Evaluation of a polyvinyl alcohol fiber reinforced. This paper reports the results of experimental tests aimed at the comprehension of the behaviour of concrete and mortar modified by introducing in the mixture of polyvinylalcohol in aqueous solution. Compressive strength of pervious concrete depend upon the porosity of concrete,age, binder material type of cement,test specimen shape and size,showed huge influence on the strength of pervious concrete. Effect of polyvinyl alcohol on the rheological properties of cement. This research was done to evaluate a polyvinyl alcohol fiber reinforced engineered. Low cracking concretes for the closure pours and overlays. A number of studies exist on the matter, in which the properties. The influence of graphene oxide go and polyvinyl alcohol pva fiber on the mechanical performance, durability, and microstructure of cementbased materials was investigated in this study. December 20 the panel determined not to reopen the safety assessment of polyvinyl alcohol. Polyvinyl chloride pvc, a synthetic resin made from the polymerization of vinyl chloride.
Polyvinyl alcohol pva, a colourless, watersoluble synthetic resin employed principally in the treating of textiles and paper. A model based on fiber bridging mechanics and the rule of mixtures is developed to characterize fracture toughness. Polyvinyl alcohol pva fiber, fiber in the concrete evenly disperses, randomly distributes then overlaps into a threedimensional network structure. The release agent pva has two solvents, methylated spirits denatured alcohol and water. This research was done to evaluate a polyvinyl alcohol fiber reinforced engineered cementitious composite pvaecc and assess the prospects to utilize the material in the bonded pavement overlay.
Industrial wastes such as fly ash were used as additives in the self compacting concrete. Dissolved polyvinylalcohol pva has also been used as a concrete additive. Ployvinyl alcohol is a watersoluble polymer which has. Butyraldehyde and formaldehyde afford polyvinyl butyral pvb and polyvinyl formal pvf, respectively. Mechanical and structural properties of polyvinyl alcohol fibre. Pdf mechanical and structural properties of polyvinyl. The present research work has been done to find the best suitable mix on addition and replacement with some other materials possessing similar physical properties as conventional concrete materials. This site is like a library, use search box in the widget to get ebook that you want. A highperformance polyvinyl alcohol fiberreinforced engineered cementitious composite pva ecc for structural applications has been developed under the performancedriven design approach. Nineteen concrete mixtures are developed by incorporating different dosages up to 0. Molecules free fulltext effect of polyvinyl alcohol. Pva is unique among polymers chemical compounds made up of large, multipleunit molecules in that it is not built up in polymerization reactions from singleunit precursor molecules known as monomers.
Cementbased materials containing graphene oxide and. The mndot concrete and metals lab provided equipment and testing. It is mainly used in papermaking, textiles, and a variety of coatings. Compressive strength improvement and admixture potential. Pdf experimental behaviour of polyvinylalcohol modified concrete. Uniaxial tests under displacement control both monotonic and cyclic are performed to study the ductility properties of the new composite material. Tensile strainhardening behavior of polyvinyl alcohol.
This paper reports the results of experimental tests aimed at the comprehension of the behaviour of concrete and mortar modified by introducing in the mixture of polyvinyl alcohol in aqueous solution. Polyvinyl alcohol was first prepared by hermann and haehnel in 1924 by hydrolyzing polyvinyl acetate in ethanol with potassium hydroxide. Samali3 1, 2, 3 centre for built infrastructure research, school of civil and environmental engineering, university of. Covinol polyvinyl alcohol pvoh, pva, pval is a watersoluble synthetic polymer. Polyvinyl alcohol has high tensile strength and flexibility. Polyvinyl alcohol, compressive strength, split tensile strength. The yield stress of modified cement mortar is less than that of unmodified mortar when the degree of polymerization and the content of. Polyvinyl alcohol pva fibre, fibre reinforced concrete frc, mechanical properties, modulus of rupture, flexural toughness abstract. Research article drying shrinkage behaviour of fibre. Experimental study on flexural toughness characteristic of. Effect of polyvinyl alcohol on the hydration of cement. Us2733995a us2733995da us2733995a us 2733995 a us2733995 a us 2733995a us 2733995d a us2733995d a us 2733995da us 2733995 a us2733995 a us 2733995a authority us united states prior art keywords polyvinyl acetate water cement weight dry prior art date 19560207 legal status the legal status is an assumption and is not a legal conclusion. Experimental behaviour of polyvinylalcohol modified concrete. The report also discusses poly vinyl alcohol fiber reinforced concrete materials properties and mix design.
Polyvinyl alcohol is produced commercially from polyvinyl acetate, usually by a continuous process. Caco3 and polyvinyl alcohol fibers on fresh and mechanical performance of concrete incorporating fly ash. Though the strength parameters of the pvalcement pastes are comparable to virgin cement paste their resistance to acid is far superior. In the concrete, portland cement was replaced with 1, 2, 3, and 4% by weight of nano. Safety assessment of polyvinyl alcohol as used in cosmetics. The use of polyvinyl alcohol pva as a mold release agent. Preparation of polyvinyl butyral is the largest use for polyvinyl alcohol in the u. Pvaecc is a ductile material that can achieve extremely high flexural strength and tensile. Architectural uhpc can achieve compressive strengths up to 17,000 psi 117 mpa and flexural strengths up to 2,900 psi 20 mpa. It has no odor and is not toxic, and is resistant to grease, oils, and solvents. The pva fiber will be added to the conventional concrete 0%, 0. Such adhesive is available for bonding wood, paper and fabric etc. Comparisons are made with a lightweight concrete having equal density, and a normalweight concrete.
Pdf mechanical properties of polyvinylalcohol modified concrete. Static mechanical properties of polyvinyl alcohol fibre reinforced concrete pvafrc. Our global production and service network make us your perfect partner for pvoh resins. Dynamic compressive and tensile characteristics of a new. Influence of polyvinyl alcohol, steel, and hybrid fibers. Polyvinyl alcohol history 1998 cir published the safety assessment on polyvinyl alcohol with the conclusion safe as used in cosmetic formulations. Polyvinyl acetate an overview sciencedirect topics. The ratios of 230, 440, 620, and 1100 for water, cement, sand, and aggregate were used, respectively. Properties of cement pastes containing varying amounts of each of polyvinyl alcohol pval, mixtures of polyvinyl alcohol and phenol formaldehyde pf and mixtures of poly vinyl alcohol and borax were studied in this paper. Based on the astm method, the flexural toughness of pva. Based on total concrete volume, four fibre fractions 0. Poly vinyl acetate is it is a synthetic resin made by polymerize vinyl acetate. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete. Click download or read online button to get polyvinyl alcohol fibers book now.