Upcycling and reclaiming of low quality or stored coal combustion fly ashes could enable to tap into a voluminous resource supplementary cementitious materials (SCMs) for low-carbon blended cements. Low reactivity are usually either too crystalline coarse. Beneficiation treatments coarse comprise size classification milling processes extract produce fine fractions higher pozzolanic reactivity. ...

OBJECTIVES In this study, we compared the functional results of incus interposition and the use of bone cement in patients who underwent type 2 tympanoplasty due to isolated incus defects. PATIENTS AND METHODS A total of 47 patients including 12 patients with incus interposition and 35 patients with bone cement were enrolled in the study. The middle ear risk indices (MERI) of the patients wer...

Fretting wear debris generated at the stem–cement interface has nowadays been considered to play an important role in the overall failure of cemented total hip replacement (THR). Those wear debris within a certain size range would transport along bone cement deficiencies to bone tissue, resulting in a significant bone resorption and subsequent aseptic loosening of the femoral component, which i...

Aims Periprosthetic fractures (PPFs) around cemented taper-slip femoral prostheses often result in a component that is loose at the prosthesis-cement interface, but where cement-bone interface remains well-fixed and bone stock good. We aim to understand how best classify manage these by using modification of Vancouver classification. Methods reviewed 87 PPFs. Each was first episode fracture com...

The purpose of this study was to compare regional bond strength at middle and cervical thirds of the root canal among glass fiber-reinforced composite (FRC) endodontic posts luted with different cements, using the push-out test. To compare the performance (retention) of two types of luting cements polycarboxylat cement and Glass ionomer cement used to cement translucent fibre post. and To compa...

A nonlinear programming problem was developed for the separation and classification of Portland cement particles into different fractions through optimal design two cyclones classifier in series. The equations restrictions considered included global mass balances, geometric cyclones, efficiency calculation, operating limitations process pressure drops equipment. results show that an increase on...

Carbon nanotubes (CNTs) and nanofibers (CNFs) were synthesized on clinker and silica fume particles in order to create a low cost cementitious nanostructured material. The synthesis was carried out by an in situ chemical vapor deposition (CVD) process using converter dust, an industrial byproduct, as iron precursor. The use of these materials reduces the cost, with the objective of application ...

Gels of calcium-silicate-hydrates (C-S-H) are the glue that is largely responsible for the mechanical properties of cement. Despite their practical relevance, their nano-scale structure and mechanics are still mainly unexplored, because of the difficulties in characterizing them in a complex material like cement. We propose a colloidal model to investigate the gel mechanics emerging in the crit...

The paper considers the concept of harmful and dangerous production factors their classification, as well main affecting employees cement enterprises

Background & Aims: Treatment of osteoporotic distal radius fracture with metaphyseal defect is often complicated by secondary displacement, because of posterior cortex comminution. The aim of this study was to investigate functional outcomes and advantages of injection of bone cement in stabilizing and maintaining this fracture reduction. Methods: This prospective study was performed on 20 ...