Volcanic Silica Cement Admixture
Volcanic Silica Cement Admixture is a pozzolanic material containing A-Sio2 amorphous silica and minor amounts of residual minerals
According to test results, the concrete specimens containing 5 percent, 10 percent, 15 percent, and 20 percent A-Sio2 replacement by weight for cement had the best compressive and flexural strength. The mechanical properties of conventional concrete mixtures could be improved by replacing cement separately and simultaneously with a super plasticizing admixture, according to the results.
Product Details
Volcanic Silica Cement Admixture is a pozzolanic material containing A-Sio2 amorphous silica and minor amounts of residual minerals
According to test results, the concrete specimens containing 5 percent, 10 percent, 15 percent, and 20 percent A-Sio2 replacement by weight for cement had the best compressive and flexural strength. The mechanical properties of conventional concrete mixtures could be improved by replacing cement separately and simultaneously with a super plasticizing admixture, according to the results.
Fine-grained amorphous silica (a-SiO2) has a high pozzolanic activity, making it a valuable component of blended binders in concrete production. The origins of A-SiO2 used in cement-based composites are extremely diverse. Amorphous SiO2 is found in varying amounts in a variety of supplementary cementing materials (SCMs) that are used as partial replacements for Portland cement. The suitability of a commercially produced silica powder as a partial replacement for Portland cement in cement paste mix design is investigated in this work. As a reference binder, Portland cement CEM I 42.5R produced in accordance with EU standards is used.
Volcanic Silica Cement Admixture is used in dosages of 5, 10, 15, and 20% by mass of cement. In all of the pastes studied, the water/binder ratio is kept constant. Specific surface area, density, loss of ignition, pozzolanic activity, chemical composition, and SiO2 amorphous phase content for the applied silica Basic physical properties such as bulk density, matrix density, and total open porosity are accessed for pastes developed on the basis of a cement-silica blended binder. MIP analysis is used to determine the distribution of pore size. The automatic Vicat apparatus measures the initial and final setting times of fresh mixtures. The effect of silica cement admixture on mechanical resistivity was determined by measuring compressive strength, bending strength, and dynamic Young’s modulus.
The obtained data demonstrate the workability of paste mixtures containing silica, while the setting process is accelerated. The reaction activity of silica with Portland cement minerals, on the other hand, results in a slight decrease in porosity and an increase in mechanical resistivity of cement pastes containing a-SiO2.
Nowadays, supplementary cementitious materials (SCMs) are widely used in the preparation of cement composites, either in the form of blended cement or separately added to the composite mix. Active silica-rich materials are an appropriate solution for partially replacing Portland cement [1]. Furthermore, the majority of SCMs are industrial byproducts, and their use in cement-based composites has both environmental and economic benefits. The admixture of various SCMs typically modifies the properties of cement composite to some extent in both the fresh and hardened states. These changes are influenced by various chemical and mineralogical compositions, as well as particle size characteristics related to water requirement and reactivity [2]. Because active silica particles are much smaller, they help to fill voids between cement particles and other components. Because the gaps between the particles are minimized and bridged by hydration products, the filler effect promotes the formation of a denser microstructure.
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