AIM The aim of this in vitro study was to evaluate the influence of the Dental chair light on the bond strength of light cured composite resin. MATERIALS AND METHODS Sixty therapeutically extracted human premolar teeth were randomly allocated to two groups of 30 specimens each. In both groups light cured composite resin (Transbond XT) and MBT premolar metal brackets (3M Unitek) was used to bo...

This work focuses on the controllable fabrication of polymorphic nanostructured carbons consisting hierarchical pores via “One-for-All” strategy from a single precursor-crude oil. Five kinds tuned with tremella-, honeycomb-, waxberry-, nanorod- and nanocube-like structures were obtained crude oil, by employing facile room temperature curing structural regulation methods followed thermal treatme...

In this paper, we report the results of our investigation on the possibility of producing foam concrete by using a geopolymer system. Class C fly ash was mixed with an alkaline activator solution (a mixture of sodium silicate and NaOH), and foam was added to the geopolymeric mixture to produce lightweight concrete. The NaOH solution was prepared by dilute NaOH pellets with distilled water. The ...

The influence of temperature on the transport properties cover concrete is crucial for adjusting in situ measurements. This study investigated effects storage room air permeability and water sorptivity Four conditions (5, 20, 30, 35 °C) with constant relative humidity (60%RH) were applied to 11 specimens produced using two types cement, five water-to-cement ratios, four curing periods. Three no...

A new structure bulk tobacco curing barn was presented. To study the temperature and humidity field in the new structure tobacco curing barn, a 3D transient computational fluid dynamics (CFD) model was developed using porous medium, species transport, κ-ε turbulence and discrete phase models. The CFD results demonstrated that (1) the temperature and relative humidity predictions were validated ...

15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. 16. Abstract Curing has substantial effects on the long-term performance of Portland cement concrete (PCC) pavement. TxDOT requires two applications of curing compounds, with a maximum 180 sf/gal per each application. However, no compliance testing is cond...

To maximize the utilization of red mud in geopolymers, a mud–metakaolin (RM-MK) geopolymer and mud–fly ash (RM-FA) were prepared, respectively. The effects content on compressive strength microstructure geopolymers investigated under three different curing conditions. results showed that decreased linearly with an increase content, whether at room temperature or 80 °C. Surprisingly, autoclave, ...