Lightweight concrete

Patent metadata

Field	Value
Publication number	US-2018222798-A1
Application number	US-201815891765-A
Country	US
Kind code	A1
Filing date	Feb 8, 2018
Priority date	Feb 9, 2017
Publication date	Aug 9, 2018
Grant date	—

Abstract

A lightweight structural concrete formulation comprises a wet mix of about 460 kg/m 3 of cementitious material such as ordinary Portland cement of which about 50 percent has been replaced by ground granulated basic furnace slag (GGBFS) and 7 percent by silica fume (SF) in other words the mix introduces between about 178 and 228 kg/m 3 therefore the combination is good to produce secondary reaction products when the cement hydrates which produces secondary calcium silicate hydrate (C-S-H) which makes the structure dense and thereby increases its mechanical durability characteristics of the concrete product. Possible ratios of GGBFS and SF are 30-70 percent and 5-10 percent, respectively. By making the structures dense increases the mechanical and durability characteristics of the concrete product. Other ratios have been made including GGBFS of 30-70 percent and silica fume 5-10 percent, respectively. It can be noted that the silica fume was added to the mixture as a supplementary cementitious material (SCM) not as an aggregate. It should also be noted that the particle sizes of GGBFS ranges between about 20-40 mm and that of silica fume is less than 20 mm.

First claim

What is claimed is:

1 . A lightweight structural concrete comprising and/or consisting of (made from) a wet concrete mix of Portland cement (OPC) 198 kg/m 3 , GGBFS 232 kg/m 3 , silica fume (SF) about 32 kg/m 3 , perlite aggregate 140 kg/m 3 , water in an amount of water/cement of about 0.25 and minor amounts of coarse aggregate and fine aggregate.

2 . A lightweight structural concrete product according to claim 1 , in which said wet mix comprises between about 178 and 228 kg/m 3 OPC, between about 207 and 253 kg/m 3 GGBFS, between about 29 and 35 kg/m 3 silica fume, between about 100 and 176 kg/m 3 of perlite aggregates and minor amounts of coarse fine aggregate.

3 . A lightweight structural concrete product according to claim 2 , in which said light aggregates are present in amount of between about 110 and 160 kg/m 3 for a lightweight structural concrete product.

4 . A lightweight structural concrete product according to claim 3 , in which said perlite aggregate comprises about 112 kg/m 3 per unit of cement.

5 . A lightweight structural concrete product according to claim 4 , in which said perlite aggregate comprises about 140 kg/m 3 per unit of cement.

6 . A lightweight structural concrete product according to claim 4 , in which said perlite aggregate comprises about 160 kg/m 3 per unit of cement.

7 . A lightweight structural concrete product made from a wet mix consisting of about 178 and 228 kg/m 3 of ordinary Portland cement; between about 207 and 253 kg/m 3 GGBFS; between about 29 and 35 kg/m 3 per unit of cement of silica fume; and about 176 kg/m 3 per unit of cement.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Ibrahim Mohammed
• Barry Mohammed Salihu
• Alhems Luai M
• Ahmad Aftab
• Rahman Muhammad Kalimur

Classifications

• C04B2111/00068

  Mortar or concrete mixtures with an unusual water/cement ratio · CPC title

• C04B2111/28

  Fire resistance, i.e. materials resistant to accidental fires or high temperatures · CPC title

• C04B2111/50

  Flexible or elastic materials · CPC title

• C04B2111/26

  Corrosion of reinforcement resistance · CPC title

• C04B18/027

  Lightweight materials · CPC title