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Chloride diffusivity of pure cement paste

Web3.3. Mobility of Chloride Ions The diffusivity of chloride ions was calculated for concrete specimens immersed in a 4.0 M NaCl solution for 150–180 days. The diffusivity and surface chloride concentration were calculated using the chloride profiles with 2.0 mm, as given in Figure 3. It is evident that the variation in the diffusion WebOct 21, 2024 · Concrete containing 2% nano-titanium dioxide by weight of cement demonstrated improved impermeability when compared with pure concrete, owing to improvements in microstructure and porosity. In comparison with pure concrete, the concrete containing nano-titanium dioxide had superior performance in resisting the …

Modeling of the chloride diffusivity of ultra-high performance …

WebOther parameters have been studied for OPC, i.e. “Carmen Andrade et al.” considered concrete resistivity as a parameter represents concrete behaviour against chloride ingress due to reactivity between chlorides and cement phases, whereas the resistivity informs that the available space in non-saturated in the drying level solid material ... WebThe chloride diffusivity data of the structural concretes were collected from the on-site laboratories for different concrete elements in the different contract bids. The chloride … craig boyer cfo https://slk-tour.com

Effects of extended mixing processes on fresh, hardened and …

WebFeb 28, 2024 · Chloride ion diffusion properties are important factors that affect the durability of cementitious materials. Researchers have conducted much exploration in this field, both experimentally and theoretically. Numerical simulation techniques have been greatly improved as theoretical methods and testing techniques have been updated. WebAn attempt is made to predict the probable effect of the aggregate on chloride ion diffusion into saturated concrete. It is shown that if the chloride ion diffusion coefficient of an aggregate ranges from 0.2 to times that of the cement paste matrix, then this could result in variations in the concrete chloride ion diffusion coefficient of up to 10:1. WebJun 1, 2024 · Then, a new self-consistent homogenization scheme for estimating the chloride diffusivity in cement paste is derived (see Sect. 3 ), and the chloride diffusivity in the cement paste pore solution is assessed (see Sect. 4 ). After a comprehensive discussion (see Sect. 5 ), a brief summary and outlook concludes the paper (see Sect. 6 ). craig boylan

Study on the damage resistance and deterioration behavior of GO ...

Category:弗里德尔盐，Ca2Al(OH)6(Cl,OH)·2H2O：其固溶体及其在氯化物结合中的作用,Cement and Concrete ...

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Chloride diffusivity of pure cement paste

(PDF) Enhancing the structures lifetime by using Chloride …

WebOct 13, 2024 · The ASTM C1760 is another testing method for a rapid indication (i.e., in one minute) of the concrete’s resistance to the penetration of chloride by diffusion. The results of this test method can also be related to the apparent chloride diffusion coefficient that is determined using the ASTM C1556 test method. WebMay 1, 2011 · To verify the proposed model, the diffusion coefficient of chloride ions, the degree of hydration, and peak radius of capillary pores of cement paste specimens were measured. The predicted results for chloride diffusivity …

Chloride diffusivity of pure cement paste

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WebJan 29, 2009 · In evaluating the chloride diffusivity of cement paste, the cement paste is assumed to be an isotropic medium and pores are modeled as spheroids with a fixed … WebFeb 1, 2011 · 1.. IntroductionIt is known that chloride content and penetration depth into concrete are highly dependent on microclimatic conditions, including the relative …

WebMay 5, 2008 · By modeling hardened cement paste as a two-phase composite material, composed of gel and capillary pores and solid cement gel, an analytical solution is … WebJun 20, 2024 · A two-step scheme is presented for estimating the chloride diffusivity of pure cement paste. In the scheme, gel pores are included in the solid skeleton, …

WebApr 12, 2024 · To exploretheeffects of physical, mechanical, anti-deterioration properties of graphene oxide (GO) on cement-based cementitious materials, GO sheet dispersions … WebJun 6, 2024 · This paper develops a highly efficient numerical method for estimating the chloride diffusivity of mature cement paste. In the method, the two-dimensional …

WebMoreover, Zhang et al. found that adding 5·1·8 phase crystal seeds to magnesium chloride oxide cement paste induced the formation of more 5·1·8phase, resulting in a denser microstructure, whereas the 3d and 28d compressive strength of the prepared cement were increased by 18.89% and 3.15%, respectively [23].

craig boykinWebAug 5, 2016 · Chloride diffusivity in hardened cement paste from microscale analyses and accounting for binding effects - IOPscience D* or self-diffusion coefficient: it is … diy bowfishing boatWeb1 day ago · The free chloride ion diffusion coefficient (D c) f and chloride ion concentration of the concrete surface layer (C s) can be obtained (in Table 3). When 10% LS is added, the (D c) f and C s of the AAS-LS system are both the lowest. The addition of LS within 15% does not seem to have a significant negative effect on the resistance to … diy bowl chairWebNearly all concrete degradation mechanisms are affected by the permeability and diffusivity of the cement paste matrix, which is essentially controlled by the capillary pore network within the material. But beyond this, specific modifications can be made to further improve the durability of concrete for a given case. craigbrack road eglintonWebspecimens with different mixtures into one “universal” chloride diffusivity of the cement paste pore solution, dpore = 1.07 × 10−10 m2/s (Pivonka et al. 2004). Interestingly, this … diy bowhuntingWebNov 27, 2024 · The chloride ion diffusion coefficient of concrete with a water-binder ratio of 0.35 is about 1.0 × 10 −12 m 2 s −1. When the water-binder ratio decreases from 0.45 to 0.35, the chloride ion diffusion coefficient is greatly reduced by about 60%. diy bowling ball rackWebJun 1, 2024 · It is found from the numerical results that the degree of cement hydration, the capillary porosity, and the chloride diffusivity evaluated from two-dimensional … craig brackett murrells inlet