Date palm ash based cement compositions

Patent metadata

Field	Value
Publication number	US-2019062214-A1
Application number	US-201715690890-A
Country	US
Kind code	A1
Filing date	Aug 30, 2017
Priority date	Aug 30, 2017
Publication date	Feb 28, 2019
Grant date	—

Abstract

A concrete or mortar composition including (i) a cementitious binder material that contains Portland cement and 1-50 wt % date palm ash relative to the total weight of the cementitious binder material, (ii) a coarse aggregate, (iii) a fine aggregate, and (iv) water, wherein the cementitious binder material is present at 200-500 kg per m 3 of the concrete or mortar composition.

First claim

1 : A concrete or mortar composition, comprising:
a cementitious binder material comprising Portland cement and 1-50 wt % date palm ash relative to the total weight of the cementitious binder material; a coarse aggregate; a fine aggregate; and water; wherein the cementitious binder material is present at 200-500 kg per m 3 of the concrete or mortar composition.

2 : The concrete or mortar composition of claim 1 , wherein the cementitious binder material comprises 5-15 wt % of the date palm ash relative to the total weight of the cementitious binder material.

3 : The concrete or mortar composition of claim 1 , wherein the date palm ash comprises 30-40 wt % SiO 2 relative to the total weight of the date palm ash.

4 : The concrete or mortar composition of claim 1 , wherein the date palm ash comprises 10-15 wt % of CaO relative to the total weight of the date palm ash.

5 : The concrete or mortar composition of claim 1 , wherein the date palm ash comprises 0.1-1.0 wt % of Fe 2 O 3 relative to the total weight of the date palm ash.

6 : The concrete or mortar composition of claim 1 , wherein the date palm ash comprises 5-10 wt % of MgO relative to the total weight of the date palm ash.

7 : The concrete or mortar composition of claim 1 , wherein the date palm ash comprises 0.1-1.0 wt % of Al 2 O 3 relative to the total weight of the date palm ash.

8 : The concrete or mortar composition of claim 1 , wherein the date palm ash has a specific gravity of 2.0-2.5.

9 : The concrete or mortar composition of claim 1 , wherein the date palm ash has a maximum particle size of less than 0.2 mm.

10 : The concrete or mortar composition of claim 1 , wherein the Portland cement is Ordinary Portland cement (OPC) Type I.

11 : The concrete or mortar composition of claim 1 , wherein a weight ratio of the fine aggregate to the coarse aggregate is in a range of 0.5-0.8.

12 : The concrete or mortar composition of claim 1 , wherein the coarse aggregate has particle size of 3-25 mm, and the fine aggregate has a particle size of less than 0.5 mm.

13 : The concrete or mortar composition of claim 12 , wherein the coarse aggregate is crushed limestone and the fine aggregate is dune sand.

14 : The concrete or mortar composition of claim 1 , wherein the weight ratio of the water to the cementitious binder material is 0.2-0.6.

15 : The concrete or mortar composition of claim 1 , wherein the cementitious binder material comprises 5-15 wt % of the date palm ash relative to the total weight of the cementitious binder material, and which has at least one selected from the group consisting of
a 3 day compressive strength of 35-50 MPa after setting, a 28 day compressive strength of 56-60 MPa after setting, and a 360 day compressive strength of 83-90 MPa after setting.

16 : The concrete or mortar composition of claim 1 , wherein the cementitious binder material comprises 5-15 wt % of the date palm ash relative to the total weight of the cementitious binder material, and which has at least one selected from the group consisting of
a maximum initial rate of water absorption of 0.25-0.72 mm/s after setting, a maximum secondary rate of water absorption of 1.75-2.25 mm/s after setting.

17 : The concrete or mortar composition of claim 1 , wherein the cementitious binder material comprises 5-15 wt % of the date palm ash relative to the total weight of the cementitious binder material, and which has an average chloride permeability of 2,000-3,500 coulombs after setting.

18 : A cured concrete or mortar product comprising the composition of claim 1 in cured form.

19 : The cured concrete or mortar product of claim 18 , wherein the cementitious binder material comprises 5-15 wt % of the date palm ash relative to the total weight of the cementitious binder material, and which has at least one selected from the group consisting of
a 3 day compressive strength of 35-50 MPa, a 28 day compressive strength of 56-60 MPa, and a 360 day compressive strength of 83-90 MPa.

20 : The cured concrete or mortar product of claim 18 , wherein the cementitious binder material comprises 5-15 wt % of the date palm ash relative to the total weight of the cementitious binder material, and which has at least one selected from the group consisting of
a maximum initial rate of water absorption of 0.25-0.72 mm/s, a maximum secondary rate of water absorption of 1.75-2.25 mm/s, and an average chloride permeability of 2,000-3,500 coulombs.

Assignees

• Univ Imam Abdulrahman Bin Faisal

Inventors

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

Classifications

• C04B28/04 Primary

  Portland cements · CPC title

• C04B2201/52

  High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC] · CPC title

• C04B14/06

  Quartz; Sand · CPC title

• C04B2201/50

  for the mechanical strength · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title