Influence of Hydrostatic Pressure on Compressive Strength of Self-consolidating Concrete

Abstract

The design of unique chamber, in which the SCUWC (self-consolidating underwater concrete) can be tested under the impact of the hydrostatic pressure from 0.1 MPa to 0.5 MPa, is presented in the paper. The results of the preliminary tests of the effect of the hydrostatic pressure on the compressive strength of SCUWC were shown. The impact of the hydrostatic pressure on the compressive strength values of test specimens has been confirmed. There has been an increase in the strength of the specimens taken from the upper parts of the concrete samples. As it can be seen from the preliminary research, the differences in compressive strength are related to the differences that occur in the size and distribution of air voids in the samples taken from upper and lower parts of the test specimens. On the basis of the carried out investigations of the compressive strength, it can be concluded that the hydrostatic pressure has a favorable effect on the compressive strength of the tested specimens of SCUWC. Increase of the compressive strength is observed mostly in the upper layers of the samples. Preliminary analysis of the quantity and distribution of air pores in the samples of concrete subjected to pressure 0.5 MPa confirms the positive impact of the hydrostatic pressure on the layers close to the surface indicated by the absence of large air voids above 1,500 m and by reducing the quantity of air pores of size above 300 m.

Chloride corrosion resistance of underwater repair concrete in terms of the cutting effects of hydrostatic pressure

“…Dla badanych podwodnych betonów naprawczych dojrzewajcych w warunkach oddziaływania cinienia hydrostatycznego przez pierwsze 7 dni wykonano dodatkowe badania charakterystyki porów powietrznych w stwardniałym betonie zgodnie z norm PN-EN 480-11. Szczegółowe wyniki bada w zakresie iloci i rodzaju porów w badanych betonach zamieszczono w [10]. Na rys.…”

“…Jest to zwizane z mniejsz iloci porów powietrznych w warstwach przypowierzchniowych. Jak wykazały badania charakterystyki porów powietrznych [6], w górnych warstwach elementów betonowych zmniejsza si liczba duych porów (powyej 1000 µm) wraz ze wzrostem cinienia hydrostatycznego, co jak pokazały badania [9,10] znalazło odzwierciedlenie w zwikszonej wytrzymałoci na ciskanie próbek z warstw przypowierzchniowych w stosunku do warstw dolnych. Obecno niewypłukanej soli w próbkach betonowych potwierdziły badania mikroskopowe i analiza EDS.…”

“…Całkowita zawarto powietrza próbek pobranych z elementów betonowych poddanych oddziaływaniu cinienia hydrostatycznego przez 7 dni, okrelona zgodnie z PN-EN 480-11(na podstawie[10])…”

The Influence of the Type of Cement on the Properties of Surface Cement Concrete

“…An additional argument that strengthens the use of multi-component binders in the infrastructure of cements is a significant reduction in the possibility of an alkaline reaction in concrete. By analyzing the literature, one can see the works on the use of processed mineral waste or industrial waste [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. A very important element of increasing the durability of concrete is to obtain the proper aeration structure through the use of air-entraining admixtures [ 27 , 28 , 29 , 30 ].…”

Functional Method of Designing Self-Compacting Concrete

“…Since the elaboration of this concrete by Okamura and Ozawa [ 1 , 2 , 3 ], numerous works have allowed for a greater familiarity with the properties of this concrete and, above all, of the concrete mix, which ensures its specific characteristics and has enabled elaborating standards for analyzing them [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. This required a relatively long time, if we take into consideration the first applications of this concrete, for example, in the construction of the “Trans Tokio Bay Bridge” constructed across Tokyo in 1988 because the series of EN 12350 [ 35 ] was introduced in 2010.…”