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15 ώρες πριν · The water–cement ratio was set at 0.45, while the mixing mass ratio of cement, fly ash, and silica fume was adjusted to 8:1:1. The content of the water-reducing agent was modified based on the mass ratio of all cementable materials to ensure workability requirements under various design densities.
3 ημέρες πριν · Concrete mixing ratios represent the proportions of various components in a concrete mix. Common ratios include 1:2:3 for cement:sand:aggregates, indicating one part cement, two parts sand, and three parts aggregates. These ratios influence the properties of the concrete mix.
3 ημέρες πριν · The general expression for the proportions of cement, sand and coarse aggregate is 1 : n : 2n by volume. 1 : 1 : 2 and 1 : 1.2 : 2.4 for very high strength. 1 : 1.5 : 3 and 1 : 2 : 4 for normal works. 1 : 3 : 6 and 1 : 4 : 8 for foundations and mass concrete works. Recommended Mixes of Concrete. (2) Fineness Modulus Method:
5 ημέρες πριν · Chemistry. Typical crack pattern of the alkali-silica reaction (ASR). The gel exudations through the concrete cracks have a characteristic yellow color and a high pH. The fatty aspect of the exudations imbibing the concrete porosity along the cracks is also a distinctive feature of ASR. The alkali-silica reaction as a chemical cycle process.
5 ημέρες πριν · Learn the essential methods and quality control measures for mixing concrete to ensure strong and durable construction. Discover hand, machine, and ready-mix techniques, and explore sustainable practices to reduce environmental impact.
1 ημέρα πριν · A stoichiometric diagram of the combustion reaction of methane. Stoichiometry (/ ˌ s t ɔɪ k i ˈ ɒ m ɪ t r i /) is the relationship between the weights of reactants and products before, during, and following chemical reactions.. Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products, leading to the insight ...
2 ημέρες πριν · Hot compression tests were carried out at temperatures and strain rates ranges of 700–1000 °C and 0.0005–0.1 s −1, respectively.Experiments were conducted with similar set-up to the one used in the previous study by the authors with Co samples [11, [47], [48]].It included the use of an Instron 4507 universal deformation machine with a coupled radiation furnace, Mo-base compression tools ...
