Through orthogonal experimental design, the influence of water-binder ratio, binder-sand ultrafine mineral admixture content, and steel fiber content on fluidity basic mechanical properties rapid-repair materials was studied. The optimal mixing ratio parameters were determined, its swelling shrinkage performance microstructure analyzed. results showed that most significant factors affecting mat...

Alternative current impedance spectroscopy (ACIS) is a promising non-destructive testing method to monitor long-term change and assess the durability of concrete. This study investigates influences Ethylene Diamine Tetraacetic Acid (EDTA) on hydration hardening cement by ACIS. It found that EDTA retards early-age but can facilitate later age reaction. Pastes with show comparable or higher compr...

Stress evolution of restrained concrete is directly related to early-age cracking (EAC) potential concrete, which a tricky problem that often happens in engineering practice. Due the global objective carbon reduction, Ground granulated blast furnace slag (GGBFS) has become more promising binder comparing with Ordinary Port-land Cement (OPC). Although GGBFS produces less hydration heat further p...

This paper presents the results of an experimental study dealing with the influence of water/cement (w/c) ratio and curing temperature on the autogenous deformations and self-induced stresses in early-age concrete. Two concrete mixes, w/c ratio 0.33 and 0.37, were cured isothermally at 10, 20, 30 and 40°C. The linear deformations of a free specimen and the self-induced stresses of a fully restr...

The human brain changes with age. However, the rate and the trajectories of change vary among the brain regions and among individuals, and the reasons for these differences are unclear. In a sample of healthy middle-aged and older adults, we examined mean volume change and individual differences in the rate of change in 12 regional brain volumes over approximately 30 months. In addition to the ...

Excessive cracking due to restraint of thermal and shrinkage strains is a widespread problem in the concrete construction industry. In design, induced managed by provision reinforcement intended distribute internal such way as control pattern limit crack widths. The area secondary (horizontal) required members retaining walls water tanks often governed need early age cracking. This paper presen...

because thin plate reinforced concrete members such as walls and slabs are greatly influenced by the drying shrinkage, cracks can occur in these members due to the restraint of the volume change caused by drying shrinkage. therefore, the control of cracking due to drying shrinkage is very important in building construction that the thin plate members are frequently used. however, few researches...

In an attempt to increase sustainability of construction materials, both ground granulated blast-furnace slag (GGBS) and, less popular, copper (CS) can be used in alkali-activated composites. However, such composites are often more susceptible cracking, triggered by the self-desiccation processes. The addition superabsorbent polymers (SAP) may enable internal curing concrete and prevent excessi...