A system and method for applying a cement composition, including storing a slurry, adding magnesium oxide to the slurry to give a magnesium-oxychloride cement slurry, pumping the magnesium-oxychloride cement slurry into a wellbore, and sealing a loss circulation zone in the wellbore.

A composition for use in making a structural assembly board, a structural assembly made from the composition, and a method of making the structural assembly board is provided. The composition includes magnesium oxide having purity of 94-98 wt %; magnesium chloride; and water. The magnesium oxide has at least two different particles sizes. The composition and method of making the structural assembly board promote formation of 5MgO.MgCl.sub.2.8H.sub.2O to improve structural qualities of the structural assembly board.

A composition for use in making a structural assembly board, a structural assembly made from the composition, and a method of making the structural assembly board is provided. The composition includes magnesium oxide having purity of 94-98 wt %; magnesium chloride; and water. The magnesium oxide has at least two different particles sizes. The composition and method of making the structural assembly board promote formation of 5MgO.MgCl.sub.2.8H.sub.2O to improve structural qualities of the structural assembly board.

Methods for cementing a subterranean well and maintaining zonal isolation involve preparing a cement slurry that contains water, an inorganic cement and an expanding agent. The slurry is placed in the annular region between casing and the formation or between two casing strings. After the cement sets, the expanding agent reacts and causes the set cement to be in a state of compression within the annular region. The casing dimensions may fluctuate in response to a temperature change, a pressure change, a mechanical disturbance resulting from a well intervention, or mud contamination or a combination thereof. The expanding agent may further react and maintain a state of compression within the annular region. The state of compression in the annular region may be monitored by acoustic impedance measurements.

Methods for cementing a subterranean well and maintaining zonal isolation involve preparing a cement slurry that contains water, an inorganic cement and an expanding agent. The slurry is placed in the annular region between casing and the formation or between two casing strings. After the cement sets, the expanding agent reacts and causes the set cement to be in a state of compression within the annular region. The casing dimensions may fluctuate in response to a temperature change, a pressure change, a mechanical disturbance resulting from a well intervention, or mud contamination or a combination thereof. The expanding agent may further react and maintain a state of compression within the annular region. The state of compression in the annular region may be monitored by acoustic impedance measurements.

Methods and processes for depositing a fire resistant barrier on a construction material involve coating exposed webbing of, for instance, an I-joist with a fire-resistant material using a wetting layer and a thickening layer. A time period between depositing the wetting layer and thickening layer is controlled to facilitate complete wetting of the exposed webbing. Filler such as fiberglass may be included in the thickening layer. The wetting and thickening layers may be deposited on the webbing in the same application. The construction material, such as the I-joist, may then be subjected to a curing treatment and additional curing period followed by coating the second side using a similar methodology.

Methods and processes for depositing a fire resistant barrier on a construction material involve coating exposed webbing of, for instance, an I-joist with a fire-resistant material using a wetting layer and a thickening layer. A time period between depositing the wetting layer and thickening layer is controlled to facilitate complete wetting of the exposed webbing. Filler such as fiberglass may be included in the thickening layer. The wetting and thickening layers may be deposited on the webbing in the same application. The construction material, such as the I-joist, may then be subjected to a curing treatment and additional curing period followed by coating the second side using a similar methodology.

The present application discloses a reinforced and toughened MGO substrate, a preparation method thereof and a composite board having the substrate. The reinforced and toughened MGO substrate includes a middle layer and fiber layers on upper and lower surfaces of the middle layer, wherein the fiber layers are glassfiber surface mats, and the middle layer is prepared from a forming agent, a lightweight filler, a modifier and water in parts by weight as follows: 34-45 parts of light burned magnesium oxide, 23-30 parts of magnesium sulfate heptahydrate, 8-10 parts of granulated lignocellulose, 4-6 parts of xylem fiber, 0.5-2 parts of the modifier, and 18-26 parts of water; the modifier being obtained by mixing citric acid, anhydrous sodium sulfate, dihydrogen phosphate and phosphoric acid in a mass ratio of 10:3:1:6.

The present application discloses a reinforced and toughened MGO substrate, a preparation method thereof and a composite board having the substrate. The reinforced and toughened MGO substrate includes a middle layer and fiber layers on upper and lower surfaces of the middle layer, wherein the fiber layers are glassfiber surface mats, and the middle layer is prepared from a forming agent, a lightweight filler, a modifier and water in parts by weight as follows: 34-45 parts of light burned magnesium oxide, 23-30 parts of magnesium sulfate heptahydrate, 8-10 parts of granulated lignocellulose, 4-6 parts of xylem fiber, 0.5-2 parts of the modifier, and 18-26 parts of water; the modifier being obtained by mixing citric acid, anhydrous sodium sulfate, dihydrogen phosphate and phosphoric acid in a mass ratio of 10:3:1:6.

The invention relates to a panel, in particular a floor panel, suitable for forming a floor covering, wherein the panel has a substantially planar top side, and a substantially planar bottom side, at least four substantially linear side edges comprising at least one pair of opposite side edges, preferably provided with locking means.