Nuclear Magnetic Resonance (NMR) is used to study the early-age hydration as well autogenous shrinkage and drying of cement paste with addition coir fibers. The dosage water content fibers are evaluated. results show that added have a negligible influence on kinetics. However, internal curing effect saturated competition induced by dry visualized. As fiber increases, decrease due reinforcing ef...

The soft tissue architecture is an important part of an attractive smile. Autogenous connective grafts have been successful in treating gingival recession. Their availability, however, is limited by palatal anatomy. Acellular dermal matrices have been shown to be successful in the treatment of gingival recession and do not have availability problems. Traditional flap elevation can lead to shrin...

The common cause of cracking in cement paste is shrinkage due to different reasons, such as loss water and chemical reactions. Incorporating limestone fines (LF) a replacement can affect the paste. To examine this effect, five mixes were prepared with 0, 5, 10, 15 20% LF water-to-binder ratio (w/b) 0.45. Four volume stability tests conducted for each paste: chemical, autogenous drying expansion...

Abstract One of the critical factors affecting performance alkali-activated slag (AAS) is nature and dose alkali activator. The activator type can play a significant role during transition from pastes to mortars or concretes. Therefore, three basic sodium activators (water glass, carbonate, hydroxide) same molarity 4M Na + were used prepare AAS-based with different volume fractions siliceous sa...

The early age volume changes occurring during the geopolymerisation reaction are not sufficiently understood yet, due to shortage of experimental data and theoretical models. This work presents new results on chemical autogenous deformation sodium-activated geopolymers from metakaolin, focussing first 72 h reaction. show that undergo early-age expansion, shrinkage. A model is proposed explain r...

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...

:the aim of this work is to investigate the influence of sodium oxide on properties of fresh and hardened paste of alkali-activated blast furnace slag from isfahan steel plant. the silica modulus (sio2/na2o) of activator was adjusted at 0.6 and a number of mixes were designed in such a way to contain different levels of sodium oxide including 1, 2, 3, 4, 5, and 6% by weight of dry slag. the mos...

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...

This study aims to experimentally investigate the autogenous deformation and stress evolution in restrained high-volume ground granulated blast furnace slag (GGBFS) concrete. The Temperature Stress Testing Machine (TSTM) Autogenous Deformation (ADTM) were used macro-scale of GGBFS concrete with w/b ratios 0.35, 0.42, 0.50. early-age cracking (EAC) risk (quantified by stress-strength ratio) rela...