Background: Despite the evidence supporting metabolic benefits of high intensity interval exercise (HIIT), there is little information about the cardiovascular response to this type of exercise in patients with type 2 diabetes (T2D) and hypertension (HTA
PACS 81.05. Mh, 81.05.Rm In this study, the effect of chemical and thermal treatment on the pozzolanic properties of rice husk ash (RHA) was investigated. The rice husks were subjected to chemical and thermal treatments. After the chemical treatment, the husks were burned under controlled conditions in order to obtain amorphous silica to be used as a pozzolanic material. Finally the ash obtained was milled in a ball mill to reduce the size of the particles. All the products obtained were characterized in terms of silica content, amorphous character, particle size distribution, and pozzolanic activity. The ash produced after an acid treatment with HCl to the husks produced a high percentage of ash with amorphous silica; high fineness, purity, and pozzolanic activity. The silica obtained was incorporated to cement pastes and concretes to evaluate the mechanical, rheological and durability properties.
The aim of this study is to present results of an investigation about the developing of a high-performance concrete (HPC) using a highly reactive pozzolan made from chemically treated rice husk ash (ChRHA) prepared by a chemical-thermal attack to the rice husk. This particular rice husk ash (RHA) consists of 99% of silica, highly amorphous, white in color and of greater pozzolanic activity than the silica fume and another rice husk ash prepared with only by a thermal treatment. The results of the physical, chemical and mineralogical characteristics of ChRHA are analyzed. In this study, the compressive strength, flexural strength, water absorption, resistance to carbonation, total charge-passed derived from rapid chloride permeability test (RCPT) and modulus of elasticity of hardened concrete were determined in the laboratory. Test results indicate that it is possible to produce HPC with the incorporation the chemically treated RHA. The incorporation of the chemically treated rice husk ash into the concrete enhances the compressive strengthand the durability properties being comparable to the properties of high performance concretes with silica fume (SF) made with the same replacement levels.
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