The effects of the addition of three commercially available boric compounds (boric acid, boric frit, and borax) on the shielding properties of two radiation shielding concrete, made of carbonate and hematite aggregates, have been investigated. The results show that boric acid (H 3 BO 3) and its frit have deleterious effect on the setting of …

Due to this property, boron compounds are used in concrete and other cementitious composites as set retarding additives. In addition, the possibilities of usage for boron compounds in...

Hexagonal Boron Nitride Reinforced Multifunctional Well Cement for Extreme Environments; ... NETL will better define the transition of a cement slurry from a liquid to a gel, where it develops sufficient gel strength to prevent the influx of external fluids into the cement column, to minimize drilling risks from gas and fluid migration. ...

Boron can be released from industries that use boron and boron compounds, e.g. leather tanning, cement works, and glass works. Diffuse sources, and industry sources included in diffuse emissions data Boron can be released from use of consumer products containing borates such as cosmetics, washing powders, or pesticides, and sub ...

Boron muds are the by-products in the production of borax. As its too small particle size and high alkalinity, the piled boron muds could cause some serious environmental problems. Magnesium phosphate cement (MPC) is usually prepared by calcined magnesia (MgO), phosphates and retarders. Boron muds are mainly composed …

The aim of this work is to study the influence of boron and its compounds, boric acid and borax, on the hydration of Portland cement. The samples – cement paste …

Cement is widely used for the solidification of low- and intermediate-level radioactive waste materials. Radioactive borate solution with a high concentration of boron is one of the main radioactive … Expand. PDF. Save.

Abstract and Figures. The retarding and stopping effects of boron compounds at even very low concentrations on the process of cement hydration are well known phenomena. Due to this property, boron ...

Thus, low-temperature separation of boron-rich slag from the iron phase was conducted at 1523 K via super-gravity. The boron was efficiently recovered into the boron-rich slag with a high recovery of 98.24 % and a high mass fraction of B 2 O 3 of 39.27 wt%, and almost all boron was enriched into a form of suanite. Low-temperature separation ...

The upper dark portion of the cement paste has been penetrated by the epoxy coating. ... With (a) 1,200 and (b) 2,400 ppm Boron Solutions for 183, 241, and 200 Days ...

This study investigated the mechanical properties and antibacterial properties of hexagonal boron nitride and titanium dioxide (h-BN-TiO2) nanocomposite modified traditional glass ionomer cement. The mechanism of formation of the h-BN-TiO2 nanocomposite was elucidated by conducting molecular dynamics (MD) simulations …

Despite many advantages, boron additives may act as cement setting retarders. Uncontrolled setting and hardening is not acceptable in radiation shielding concrete …

The cement industry is a major energy consumer and an important CO2 producer. Boron Active Belite (BA) cement provides high strength, low hydration temperature, reduced CO2 emission, and energy …

This paper reports that the element boron, when added to concrete, has proved effective in shielding neutron particles by …

A Portland-type cement composition having a boron-and halogen-containing component and, as hydraulically settable calcium silicates, about 20-70 percent alphaprime dicalcium silicate (a'-C 2 S) and about 10-50 percent tricalcium silicate C 3 S based upon the weight of the composition.

And the boron, in theory, could squelch the nuclear reaction. ... And unlike Chernobyl, nuclear facilities in the U.S. are entirely contained in sealed structures of cement and rebar (a mesh of ...

Light elements, such as boron and hydrogen, can absorb low neutrons and intermediate neutrons. ... The binder that is commonly used in concrete is cement. Dry cement powder reacts with water to form the binder, and the mix ratio between the cement and water defines the water-to-cement ratio, which influences the concrete strength. ...

In this article, two BYF materials, one with β-C 2 S and another one with α' H -C 2 S have been characterised with the objective to unravel the influence of admixtures, i.e., …

Adding an alcohol-based modifier can increase the compressive strength of magnesium oxysulfate cement-boron mud blends. After adding acrylic acid and D-Mannitol, the 28-day compressive strength of the sample increased by 44.7 MPa. The blending of alcohol-based modifiers has a very good effect on the curing of boron in the whole system.

Darker than silica fume and, like cement clinker, well suited to grinding, boron carbide exhibits hardness characteristics second only to diamond and boron nitride, earning the nickname "Black Diamond." Boron is an important material for nuclear applications due to its high neutron absorption cross section, UK Abrasives notes.

Effects of LiOH on setting time of Portland cement pastes mixed with synthetic solution are plotted in Fig. 1.The plain Portland cement paste prepared with the synthetic solution shows an initial setting time of 38 h and final setting time of 68 h, respectively, which is remarkably longer than the Portland cement (Table 2).The prolonged setting time of …

There is a gap between the mechanical improvement of boron nitride nanosheets in calcium silicate hydrates and the mechanical properties of macroscale samples. To link the material properties of the nanoscale cementitious composites to the tensile strength and compressive strength of the macroscale samples, multiscale …

Due to this property, boron compounds are used in concrete and other cementitious composites as set retarding additives. In... | Boron Compounds, Boric Acids and Cement | ResearchGate, the ...

Boron nitride nanosheet (BNNS) is a good candidate for cement paste to improve the weak interlayer bonding strength in three-dimensional (3D) concrete . In addition, the increased viscosity with the addition of BNNS leads to enhanced shear performance, which can help to tackle the problems of poor stability and eccentricity.

If additionally thermal neutron absorption is the goal then the colemanite containing both hydrogen and boron is a candidate. Cement type due to small differences in its chemical composition has no big influence of neutron radiation shielding but it is important for bound water content after cement hydration. This parameter is really important ...

Boron nitride nanosheets or "white grapheme" consist of a few layers of hexagonal boron nitride planes and have several unique properties compared to …

Portland cement, boron modiffed active belite cement and calcium aluminate cement as binding material were used in mortar samples. 2, 7, 28 day compressive strengths and 28 day ffexural strengths ...

The antimicrobial activity of six different boron minerals and compounds was tested against six microorganisms, including Gram-positive and Gram-negative bacteria, yeast, and fungus. Cement mortars containing 5% (w/w) boron mineral addition by weight of cement were exposed to flexural and compression tests on the 7th, 28th and 90th days.

The plain Portland cement paste prepared with the synthetic solution shows an initial setting time of 38 h and final setting time of 68 h, respectively, which is remarkably longer than the Portland cement (Table 2). ... With the replacement of CaO by MgO, the chemical resistance of boron-free glass specimens improved, while that of Mg/B ...

The use of boron carbide in the formulation of concretes is the advantages of neutron shielding for instruments and tools (Kharita et al., 2011; Martin, 2006). Ferro - boron (Fe - B) is a binary alloy of iron with boron content between 10 % and 20 % and is the lowest cost boron additive for steel and other ferrous metals (Sahin et al., 2010).