PURPOSE To clarify the relationship between variations in posterior vitreous detachments (PVDs) and visual prognoses in idiopathic epiretinal membranes (ERMs). METHODS In this retrospective, observational, and consecutive case series, we observed variations in PVDs in 37 patients (mean age, 65.7±11.0 years) with ERMs and followed them for 2 years. Three PVD types were found biomicroscopically...

For many concretes and mortars, self-desiccation results in the creation of empty capillary porosity within the cement paste microstructure, accompanied by a decrease in achieved hydration, an increase in internal stresses, and an increased propensity for early age cracking. One solution to this problem for low water-to-cement ratio concretes where external curing is ineffective has been the de...

P. Priyadharshini, G. Mohan Ganesh, A.S. Santhi Abstract— The reduction in moisture of fresh concrete results in plastic shrinkage due to tensile stress induced by capillary pressure. When the tensile strength signs beyond the capacity of concrete, it cracks and this effect in early stage of concrete is termed as plastic shrinkage of concrete. This becomes a serious issue for large surface area...

Estimating the shrinkage of structural concrete is essential to calculate, at design stage, stresses that a structure may experience due this phenomenon. Nevertheless, changes in composition, as well use wastes raw materials, alter behaviour and render invalid shrinkage-prediction models from standards. This paper shows procedure estimate recycled aggregate made with alternative binders. based ...

The high strength and durability of high-performance concrete (HPC) may be significantly reduced by shrinkage cracking. use reactive magnesium oxide (MgO) can reduce cement-based materials due to its expansive properties. This study intends analyse the validity MgO as shrinkage-reducing agent in recycled aggregate HPC. To do so, ten HPC mixes with 0%, 25%, 100% both early-age (7-days air curing...

In the present study, the multivariate adaptive regression splines (MARS) technique is employed to estimate the drying shrinkage of concrete. To this purpose, a very big database (RILEM Data Bank) from different experimental studies is used. Several effective parameters such as the age of onset of shrinkage measurement, age at start of drying, the ratio of the volume of the sample on its drying...

OBJECTIVES To evaluate the influences of chronic alcohol consumption on brain volume among social drinkers, as it is well known that alcohol misusers have a high risk of brain shrinkage. METHODS Frontal lobe volumes on MRI were compared with the current alcohol habits of consecutive 1432 non-alcoholic subjects. RESULTS After adjusting for other variables, age was found to be the most powerf...

Taking double-block ballastless track bed concrete as the object, influences of low-heat Portland cement (P·LH) and normal (P·O) on mechanical properties, adiabatic temperature rise, dry-shrinkage cracking sensitivity are studied. The results show that, prepared with two types can meet design requirements C40 concrete. It is also noticed that strength development different. That is, early P·LH ...

An experimental investigation on the chemical, physical, mechanical, and shrinkage of seawater sea sand-based ultra-high-performance concrete (UHP-SWSSC) with supplementary cementitious materials (SCM) (i.e. slag silica fume) is reported. Several mixes were designed varying proportions SCMs (25%, 37.5%, 50%, 62.5% binder), aggregate source, water-to-binder ratio. Heat evolution, density, workab...