Dispersible reinforcement is method of increase of durability of wares

V. N. Derevianko, O. V. Shapovalova, N. V. Kondratieva, A. A. Maksimenko

Abstract


Problem statement. There is a question of optimum choice of type, length and quantitative content of fibers for achievement of high strength of compositions made on the basis of cement of various activities, construction sand and reinforcing components as a part of dry building mixes. Analysis of publications. The role of fibers is that they take a part of load, interfere with development of cracks and displacement of blocks, according to numerous researches which results are generalized in works of Desov A. E., Akhverdov I. N., Solomatov V. P., Vyrovoy V. N., etc. According to existing theories, destruction of composition is carried out due to breaking and stretching of fibers. There are different types of models and theories of destruction of materials on the basis of mineral binders. According to researchers, material is not isotropic environment, and deformation and destruction of concrete is caused by the influence of external forces. In case of introduction of discrete fibers, the mechanism of tension can be presented to the following. One part of fibers works for stretching and the other one interferes with shift of particles, increasing connectivity of the system. Mineral and metal fibers, located parallel to the operating external load, increase rigidity of the system. As organic fibers have low module of elasticity, they most likely interfere with shift of the particles and reduce arising secondary tension. Therefore, the effect of reinforcing depends on structure, matrix strength and also on parameters of fibers and their properties. The purpose of the article. Development of a method of determination of the minimum length and content of components in cement and fibrous composition. Conclusions. Thus, the made analysis of the research results shows that the most effective length of polypropylene fibers with a diameter up to 15–17 µm in compositions of cement and sand mortars is in limits of 5–7 mm. The fibers content in mortars, at which compression strength increases by 15–30 %, and bending strength – by 40–70 %, does not exceed 0.2 % of the binder mass. It is typical that reinforcing is more effective for compositions in which a low-branded binder is applied. It testifies that it is possible with disperse reinforcing to eliminate partially decreasing of cement binder activity that is a result of its storage. So, strength gain due to reinforcing of mortars with binder activity 20 MPa is 50–60 % whereas strength of mortars, in which Portland cement with activity of 49 MPa is applied increased, only for 25–30 %.


Keywords


reinforcement; fibers; composition; strength; reinforcement; matrix

References


Ahverdov I. N. Intensivnost' vibrirovanijа, fiziko-mehanicheskie i deformativnye svoistva betona [The intensity of vibration, physical, mechanical and deformation properties of concrete]. Beton i zhelezobeton- Concrete and reinforced concrete. 1967. no. 1, pp. 18 – 21. (in Russian).

Vyrovoi V. N. Sistemnyi podhod v formirovanii struktury i svoistv penobetona [A systematic approach in determining the structure and properties of foam concrete]. Resursoekonomnі materіali, konstrukcії, budіvlі ta sporudi – Resource materials, structures, buildings and facilities. Zbirnyk. nauk. prats -collection of scientific papers. NUVGP, Rіvne. 2004., no. 11, pp. 17 – 21. (in Russian).

Grushko I. M. Povyshenie prochnosti i vynoslivosti betona. [Increasing strength and endurance of the concrete]. Khar'kov, Visha shkola, 1986. 150 p. (in Russian).

Gordon S. S. Struktura i svoistva tjаzhelyh betonov na razlichnyh zapolniteljаh [Structure and properties of heavy concrete in different aggregates]. Moscow, Stroiizdat, 1969. 151 p. (in Russian).

Dvorkіn L. I. Proektuvannjа skladіv betonu іz zadanimi vlastivostjаmi. [Design of concrete with desired properties]. Rіvne, Vid-vo Rіvnens'kogo derzhavnogo tehnіchnogo unіversitetu, 2000. 215 p.(in Ukrainian).

Derevjаnko V. N. Kompozicionnye materialy armirovannye organicheskimi voloknami [Composite materials reinforced with organic fibers]. Stroitel'stvo materialovedenie, mashinostroenie - Construction, materials science, mechanical engineering, Sb. nauchnyh tr. – Collection of scientific papers, Dnepropetrovsk, PGASA, 1988, no.7, pp. 203 – 204. (in Russian).

Desov A. E. Nekotorye voprosy struktury prochnosti i deformacii betonov [Some questions of the structure of strength and deformation of concrete]. Moscow, Stroiizdat, 1966. 158 p. (in Russian).

Mel'kin V. I. Prochnost' hrupkih materialov pri slozhnom naprjаzhennom sostojаnii. [The strength of brittle materials under complex stress state]. Mashinostroenie – Mechanical engineering.1970. no.2, pp.9 . – 14 . (in Russian).

Pashenko A. A. Armirovanie neorganicheskih vjаzhushih veshestv mineral'nymi voloknami [Reinforcement of inorganic binders in mineral fibers Moscow, Stroiizdat, 1988. 48 p. (in Russian).

Ryb'ev I. A. Ishodnye metodicheskie pozicii pri issledovanii iskusstvennyh stroitel'nyh konglomeratov. [The initial methodological position in the study of artificial construction conglomerates ]. Stroitel'nye materially- Construction materials. 1980, no. 2, pp.24 – 25. (in Russian).

Solomatov V. I. Kompozicionnye materialy. [Composite Materials], Moscow, Stroiizdat, 1993.148 p. (in Russian).

Sheikin A. E. K voprosu prochnosti, uprugosti i plastichnosti betona. [To a question of strength, elasticity and plasticity of concrete]. MIIT- MIET Moscow, 1946, pp. 69-71. (in Russian).


GOST Style Citations


Ахвердов И. Н. Интенсивность вибрирования, физико-механические и деформативные свойства бетона / И. Н. Ахвердов, Ю. Ю. Делтунова // Бетон и железобетон. – 1967. – № 1. – С. 18–21.

 

Выровой В. Н. Системный подход в формировании структуры и свойств пенобетона / В. Н. Выровой, В. И. Мартынов, Е. Б. Мартынова // Ресурсоекономні матеріали, конструкції, будівлі та споруди : зб. наук. праць / Нац. ун-т вод. госп-ва та природокористування. – Рівне, 2004. – Вип. 11. – С. 17 – 21.

 

Грушко И. М. Повышение прочности и выносливости бетона / И. М. Грушко, А. Г. Ильин, Э. Д. Чихладзе. – Харьков : Вища шк., 1986. – 150 с.

 

Гордон С. С. Структура и свойства тяжелых бетонов на различных заполнителях / С. С. Гордон. – Москва : Стройиздат, 1969. – 151 с.

 

Дворкін Л. И. Проектування складів бетону із заданими властивостями / Л. И. Дворкін, О. Л. Дворкін, Ю. В. Гарніш. – Рівне : Вид-во Рівненського держ. техн. ун-ту, 2000. – 215 с.

 

Деревянко В. Н. Композиционные материалы армированные органическими волокнами / В. Н. Деревянко // Строительство, материаловедение, машиностроение : сб. науч. тр. / Приднепр. гос. акад. стр-ва и архитектуры. – Днепропетровск, 1988. – Вып. 7. – С. 203-204.

 

Десов А. Е. Некоторые вопросы структуры прочности и деформации бетонов / А. Е. Десов. – Москва : Стройиздат, 1966. – 158 с.

 

Мелькин В. И. Прочность хрупких материалов при сложном напряженном состоянии / В. И. Мелькин, Д. М. Жур, В. С. Егоров // Известия вузов. Машиностроение. – 1970. – № 2. – С. 9-14.

 

Армирование неорганических вяжущих веществ минеральными волокнами / [А. А. Пащенко, В. П. Сербин, А. П. Паславская, В. В. Глуховский, Ю. Л. Бирюкович, А. Б. Солодовник] ; под ред. А. А. Пащенко. – Москва : Стройиздат, 1988. – 200 с.

 

Рыбьев И. А. Исходные методические позиции при исследовании искусственных строительных конгломератов / И. А. Рыбьев, А. В. Нехорошев // Строительные материалы. – 1980. – № 2 – С. 24-25.

 

Соломатов В. И. Композиционные материалы / В. И. Соломатов, В. П. Беляев. – Москва : Стройиздат, 1993. – 148 с.

 

Шейкин А. Е. К вопросу прочности, упругости и пластичности бетона / А. Е. Шейкин // Труды Московского института инженеров транспорта. – Москва, 1946. – Вып. 69. – С. 69-71. 



Refbacks

  • There are currently no refbacks.