B. K. Kizilduman, M. Alkan, M. Doğan and Y. Turhan
K., Usuki, A., Okada, A., Kurauchi T., Kamigaito O., Synthesis and properties of polyimide–clay hybrid. J. Polym. Sci., Part A: Polym. Chem. 1993, 31, 2493.
11. Giannelis E.P., Polymer layered silicate nanocomposites. Adv. Mater. 1996, 8, 29.
12. Gianni A.D., Amerio E., Monticelli O., Bongiovanni, R., Preparation of polymer/clay mineral nanocomposites via dispersion of silylated montmorillonite in a UV curable epoxy matrix. Appl. Clay Sci. 2008, 42, 116.
13. Alberti G., Constantino U., Layered solids and their intercalation chemistry. In
L. Chen, E.A. Selimovic, M. Daunis, T.A. Bayers T, L.J. Vargas, I.T. O’Brien, C.B. McEnroe, A.E. Kozerski, A.C. Vanhoover, W.D. Gray and J.F. Caruso
-impulse device evoked large and significant gains in left leg’s calcaneal bone mineral content (+29%) and density (+33%), as well as a significant decline in osteoclast activity ( Caruso et al., 2018 ). Such results hold much promise, as the calcaneus incurs among the largest in-flight losses that are exacerbated by heightened osteoclast activity (Heer et al. 2005; LeBlanc et al., 2007 ).
The high-speed high-impact device, called an Inertial Exercise Trainer (IET; Impulse Technologies, Newnan, GA), has a mass sled that traverses its 1.9-m track parallel to the Earth
Olga Muter, Baiba Limane, Silvija Strikauska and Maris Klavins
and uptake of heavy metals in a wetland microcosm planted with Phragmites communis by humic acids addition. International Journal of Phytoremediation, 2013, Vol. 15, No. 6, pp. 536-549. http://dx.doi.org/10.1080/15226514.2012.723057
15. Park, S., Kim, K.S., Kim, J.-T., Kang, D., Sung, K. Effects of humic acid on phytodegradation of petroleum hydrocarbons in soil simultaneously contaminated with heavy metals. Journal of Environmental Sciences, 2011, Vol. 23, No. 12, pp. 2034-2041. http://dx.doi.org/10.1016/S1001-0742(10)60670-5
economic benefits, the dark point of the wooden bridge technology is that it uses a raw material often worldwide contested. The heavy deforestation threatens the natural and physical environments [ 4 , 5 , 6 , 7 , 8 , 9 ]. Nobody knows exactly how much of the forests have already been destroyed, but many scientists around the world have proved that ground movements destroy a huge area of forests [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. Drought and climate changes also contribute to their degradation [ 18 , 19 , 20 ]. In addition of the conversion of
Soumia Bellil, Khelifa Abbeche and Ouassila Bahloul
agglomeration of clay minerals with strong connectivities.
The EDS analysis shows that the sample is mainly a clay constituted of quartz silicates (Si), kaolinite (Al), iron oxide (Fe), carbonates (C), muscovite (KAl 2 ) and feldspar (K). These elements are attributed by the sand mixture, which is a quartzous discharge with kaolin, a high content of quartz (45.0%) and pure kaolinite (23.0%).
5.2 Microanalysis of treated soil
Figures 8c and d show a different structure compared to that of untreated soil (SNT). This difference can be attributed to the high bentonite
minimum global void ratio
Saturation and consolidation
The saturation of a sample represents an important stage in the experimental procedure. Indeed, its mechanical behaviour under undrained loading conditions depends heavily on the quality of its saturation. To obtain a maximum degree of saturation, the technique of carbon dioxide elaborated by Lade and Duncan (1973) was used. After taking necessary measurements, the samples have been first subjected to CO 2 for at least 30 min and then saturated by de-aired water. The evaluation of the saturation degree is
Carmen Răcănel, Mihai Dicu, Ştefan Marian Lazăr and Adrian Burlacu
Asphalt mixtures are mixtures of mineral aggregates, filler, bitumen and eventually additives in proportions determined by recipe designed in the laboratory. Asphalt mixtures used as base course are bituminous concrete.
The natural aggregates are granular materials of mineral origin that come from natural or artificial crushing of the rocks. In our country there are the various rocks: eruptive or magmatic rocks, metamorphic rocks, sedimentary rocks.
To the category of sedimentary rocks belong limestone. Sedimentary rocks are characterized by relatively high porosity and a pronounced stratification, which causes mechanical resistance to be low and vary by direction of load. Due to the structure less dense and weaker mechanical resistance, the limestone are used less in heavy traffic pavement structures.
This paper presents an asphalt mixture recipe for the base layer developed in the Laboratory of Roads from Technical University of Civil Engineering Bucharest (TUCEB), using limestone aggregates extracted from Hoghiz Quarry. The paper contains laboratory test results to determine the recipe and laboratory findings leading to the schedule of product.