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Silica flour and Silica sand our admixtures to Portland cements.
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∙ 15y ago
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What are admixture?
Admixture is defined as a material other than cement, water and aggregate that is used as an ingredient of concrete and is added to the batch immediately before or during mixing.
What name are concrete admixture?
Mineral admixture are those which are mixed with concrete ingredients and spread through out the body of concrete to favourably modify the properties of concrete . the commonly used mineral admixture are1. Fly ash2. Silica fume3. Rice Husk ash4. matakaoline
What is Opc and ppc grade of cement?
OPC is ordinary Portland cement and PPC is Portland pozolona cement. OPC is obtained by grinding clinker and gypsum whereas PPC is obtained by grinding clinker gypsum and high reactive silica. High reactive silica improves the quality of cement by reducing liberated lime.
What is an admixture?
An admixture is the action of admixing, mixing in to something.
What is the meaning of ppc cement?
Portland Pozzolana cement (PPC) is manufactured by a combination of pozzolanic materials. Pozzolana is an artificial or natural material that has silica in it in a reactive form. Along with pozzolanic materials in specific proportions, PPC also contains OPC clinker and gypsum. These pozzolanic materials include volcanic ash, calcined clay or silica fumes, and fly ash which makes around 15% to 35% of cement weight. To know more visit Banshiwala Cement- Leading Cement Company in Rajasthan India
What cement contains?
Cement contains silica and calcium
What are admixture?
Admixture is defined as a material other than cement, water and aggregate that is used as an ingredient of concrete and is added to the batch immediately before or during mixing.
What is the white coming out of cement block?
silica
Why the silica cement equipped with mold able?
Silica cement is a refractory mortar that is suitable for laying silica brick. It is equipped with an AX moldable to make it easily bond to itself and other fibrous insulations.
What name are concrete admixture?
Mineral admixture are those which are mixed with concrete ingredients and spread through out the body of concrete to favourably modify the properties of concrete . the commonly used mineral admixture are1. Fly ash2. Silica fume3. Rice Husk ash4. matakaoline
What are the name of admixture that effect on the setting time of cement?
retarder increases time to set, accelerator decreases setting time
Why does cement harden?
cement is a calcined mixture of limestone,silica and gypsum that are anhydrated and form a hard structural bond on drying
What is Opc and ppc grade of cement?
OPC is ordinary Portland cement and PPC is Portland pozolona cement. OPC is obtained by grinding clinker and gypsum whereas PPC is obtained by grinding clinker gypsum and high reactive silica. High reactive silica improves the quality of cement by reducing liberated lime.
Health risks with exposure to silica fume?
Silica fume, also known as microsilica, is a byproduct of the combustion of quartz, coal and wood chips during the production of silicon metals. silica improves compressive strength, bond strength, and the abrasion resistance of concrete. Prior to the 1970s, its release into the atmosphere was permitted, but environmental concerns eventually forced its collection and deposition into landfills. It then became economical for silica fume to be used in various applications, chiefly in high-performance concrete. Consisting of fine silicon dioxide particles that are approximately one-hundredth the size of the average cement particle, silica fume is the cement substitute of choice where high strength is critical, such as in high-rise buildings. Cement that contains silica fume looks darker than ordinary cement. Although a respirator should be worn while handling pure silica fume, a cement-silica fume mix is not considered dangerous to humans.
Is silica fume dangerous to human health?
Silica fume, also known as microsilica, is a byproduct of the combustion of quartz, coal and wood chips during the production of silicon metals. silica improves compressive strength, bond strength, and the abrasion resistance of concrete. Prior to the 1970s, its release into the atmosphere was permitted, but environmental concerns eventually forced its collection and deposition into landfills. It then became economical for silica fume to be used in various applications, chiefly in high-performance concrete. Consisting of fine silicon dioxide particles that are approximately one-hundredth the size of the average cement particle, silica fume is the cement substitute of choice where high strength is critical, such as in high-rise buildings. Cement that contains silica fume looks darker than ordinary cement. Although a respirator should be worn while handling pure silica fume, a cement-silica fume mix is not considered dangerous to humans.
Name 3 types of cement in sand stone?
Clay minerals, calcite, and silica.
Cement sand aggregate Variation in Batching Plant?
As per ASTMC94/C94M clause-8 the permissible variation of concrete ingredients as follows- Cement and cement and mineral admixtures (or cementitious material)-0 to +4% Aggregates cumulative- +/- 3% Admixture and water- +/- 3%
