Cementitious mortar composition and methods of preparation thereof

Patent metadata

Field	Value
Publication number	US-2025051226-A1
Application number	US-202318447767-A
Country	US
Kind code	A1
Filing date	Aug 10, 2023
Priority date	Aug 10, 2023
Publication date	Feb 13, 2025
Grant date	—

Abstract

A cement composition includes an ordinary Portland cement, an Arabic Gum in the amount of 0.1 to 2% by weight of the ordinary Portland cement, a sand in the amount of 150% by weight of the ordinary Portland cement, and water in the amount of 40% by weight of the ordinary Portland cement. A cured sample obtained by curing the cementitious mortar composition for at least 2 days has a porous structure including one or more microcracks from 20 to 500 nm wide and 0.1 to 500 μm long, wherein the cured sample has granules from 1 to 20 μm in diameter, the granules are bundles of microfilaments with a length from 0.2 to 5 μm, the bundles have 20 to 1000 microfilaments, and the microfilaments are in the form of cylinders.

First claim

What is claimed is:

1 . A cementitious mortar composition, comprising:
an ordinary Portland cement; an Arabic Gum in the amount of 0.1 to 2% by weight of the ordinary Portland cement; a sand in the amount of 125 to 175% by weight of the ordinary Portland cement; and water in the amount of 30 to 50% by weight of the ordinary Portland cement, wherein a cured sample obtained by curing the cementitious mortar composition for at least 2 days has a porous structure including one or more microcracks from 20 to 500 nm wide and 0.1 to 500 μm long, wherein the cured sample has granules from 1 to 20 μm in diameter, wherein the granules are bundles of microfilaments with a length from 0.2 to 5 μm, wherein the bundles have 20 to 1000 microfilaments, and wherein the microfilaments are in the form of cylinders.

2 . The composition of claim 1 , wherein the cured sample is porous and has a range of micropores from 1 to 200 μm in diameter.

3 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75 to 1.5% by weight of the ordinary Portland cement, wherein the cementitious mortar composition has an initial setting time of 280 to 430 minutes, which is 100 to 200% greater than a comparative mortar composition that is the same as the cementitious mortar composition but does not contain Arabic Gum,
wherein the initial setting time is tested according to ASTM C191.

4 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75 to 1.5% by weight of the ordinary Portland cement, wherein the cementitious mortar composition has a final setting time of 320 to 465 minutes, which is 100 to 200% greater than a comparative mortar composition that is the same as the cementitious mortar composition but does not contain Arabic Gum,
wherein the final setting time is tested according to ASTM C191.

5 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75 to 1.5% by weight of the ordinary Portland cement, wherein the cementitious mortar composition has a mortar flow of 28 to 47% greater than a comparative mortar composition that is the same as the cementitious mortar composition but does not contain Arabic Gum,
wherein the mortar flow is determined according to ASTM C230.

6 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75% by weight of the ordinary Portland cement, wherein the cured sample has a compressive strength value of 32 MPa to 53 MPa in a timeframe of 7 to 56 days, which is 12 to 32% greater than a comparative sample obtained by curing a comparative mortar composition that is the same as the cured sample but does not contain Arabic Gum.

7 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75% by weight of the ordinary Portland cement, wherein the cured sample has a flexural strength value of 4 MPa to 7 MPa in a timeframe of 7 to 56 days, which is 14 to 31% greater than a comparative sample obtained by curing a comparative mortar composition that is the same as the cured sample but does not contain Arabic Gum.

8 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75% by weight of the ordinary Portland cement, wherein the cured sample has a volume of permeable voids of 16% to 14% in a timeframe of 28 to 56 days, which is 15 to 20% less than a comparative sample obtained by curing a comparative mortar composition that is the same as the cured sample but does not contain Arabic Gum,
wherein the volume of permeable voids is tested according to ASTM C642-13.

9 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75% by weight of the ordinary Portland cement, wherein the cementitious mortar composition has a Ca:Si molar ratio of 6.

10 . The composition of claim 1 , wherein carbon is present in an amount of 0.01 to 1.3% by weight of the composition, oxygen is present in an amount of 34 to 39% by weight of the composition, sodium is present in an amount of 0.5 to 1% by weight of the composition, magnesium is present in an amount of 0.9 to 1.7% by weight of the composition, aluminum is present in an amount of 1.4 to 2.3% by weight of the composition, silicon is present in an amount of 5 to 8% by weight of the composition, sulfur is present in an amount of 4 to 8% by weight of the composition, chlorine is present in an amount of 0.1 to 0.3% by weight of the composition, potassium is present in an amount of 0.7 to 1.6% by weight of the composition, calcium is present in an amount of 40 to 45% by weight of the composition, and iron is present in an amount of 2 to 5% by weight of the composition.

11 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75% by weight of the ordinary Portland cement and wherein the cured sample has a range of micropores of from 1 to 100 μm in diameter.

12 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75% by weight of the ordinary Portland cement and wherein the cured sample has a range of microcracks of from 20 to 200 nm wide and 0.1 to 300 μm long.

13 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75% by weight of the ordinary Portland cement, wherein the cementitious mortar composition has a content of calcium-silicate-hydrate is 85 to 87% composition based on a total composition of calcium-silicate-hydrate and portlandite.

14 . The composition of claim 1 , wherein the cementitious mortar composition includes Arabic Gum in an amount of 0.75% by weight of the ordinary Portland cement, wherein the cementitious mortar composition has a content of portlandite is 13 to 15% composition based on the total composition of calcium-silicate-hydrate and portlandite.

15 . The composition of claim 1 , wherein the cementitious mortar composition may be in the form of a cube, a prism, and a paste, wherein the cube has a dimension of 50 mm×50 mm×50 mm and the prism has a dimension of 40 mm×40 mm×160 mm.

16 . The composition of claim 1 , wherein the cured sample is aged from 2 to 60 days.

17 . The composition of claim 1 , wherein the Arabic Gum comprises sodium in an amount of 0.4 to 0.8 mg, calcium in an amount of 0.1 to 0.4 g, magnesium in an amount of 5.5 to 6.0 g, potassium in an amount to 3.0 to 3.5 g, iron in an amount of 0.01 to 0.1 mg, dietary fiber in an amount to 88 to 90% by weight, total ash in an amount to 2 to 4% by weight, and reducing sugar in an amount to 0.5 to 1% by weight based on a total weight of the Arabic Gum.

18 . The composition of claim 1 , wherein the ordinary Portland cement comprises CaO in an amount of 64.3 to 64.8% by composition, SiO 2 in an amount of 21.5 to 22.5% by composition, Al 2 O 3 in an amount of 5.6 to 5.8% by composition, Fe 2 O 3 in an amount of 3.6 to 3.8% by composition, K 2 O in an amount of 0.25 to 0.45% by composition, MgO in an amount 1.8 to 2.3%, and Na 2 O in an amount of 0.15 to 0.25% by composition based on a total composition of the ordinary Portland cement.

19 . The composition of claim 1 , wherein the cementitious mortar composition is made by a process comprising:
dissolving the Arabic Gum in water to form an Arabic Gum-containing solution; mixing the ordin

Assignees

• Univ Imam Abdulrahman Bin Faisal

Inventors

• Nasir Muhammad
• Al-Kutti Walid
• Islam A B M Saiful
• Alotaibi Khalid Sager

Classifications

• C04B2111/00017

  Aspects relating to the protection of the environment · CPC title

• C04B38/0074

  expressed as porosity percentage · CPC title

• C04B2201/50

  for the mechanical strength · CPC title

• C04B28/04 Primary

  Portland cements · CPC title

• C04B24/34

  Natural resins, e.g. rosin {(C04B24/243 takes precedence)} · CPC title