King Fahd University of Petroleum and Minerals

Saudi Arabian Oil Company

Muhammad Kalimur Rahman

Mohammed Ibrahim

Abdulaziz Al-Majed

Luai M Alhems

Mohammed Salihu Barry

Mirza Talha Baig

Mobeen Murtaza

Carlos Ernesto Acero

Zakariya Saleh Al-Helal

Mesfer Mohammed Al-Zahrani

Aftab Ahmad

Sunil Kumar G Pillai

Mohammed Hussain Baluch

Salah Al-Dulaijan

A controlled low strength material has constituents that include a cement, an aggregate, and a water. The aggregate includes concrete demolition waste. The controlled low strength material has a compressive strength that does not exceed 8.3 MPa, measured at 28 days. The controlled low strength material can alternately include a heavy oil fuel ash and the controlled low strength material can have a compressive strength that does not exceed 2.10 MPa, measured at 28 days.

Recycled concrete aggregates and heavy oil fuel ash for green controlled low strength material

A controlled low strength material has constituents that include a cement, an aggregate, a heavy oil fly ash, and a water. The controlled low strength material has a compressive strength in a range of 300 kPa to 2.1 MPa. In certain embodiments, the heavy oil fly ash can be part of a heavy oil fly ash slurry.

Utilization of heavy oil fly ash to produce controlled low strength material for backfilling applications

A nanozeolite modified green concrete contains alkali-activated natural pozzolan. Natural pozzolan is a green and sustainable material, potentially useful in green concrete, e.g., to curb greenhouse gas emissions associated with ordinary Portland cement production. Nanozeolite (NZ) is present as an additive to the green concrete, e.g., at 3 to 5 wt. %, of natural pozzolan to improve strength development and microstructural properties, resulting in superior strength and denser microstructure compared to a green concrete without nanozeolite.

Nanozeolite-modified green concrete

A lightweight structural concrete formulation comprises a wet mix of about 460 kg/mof cementitious material such as ordinary Portland cement of which about 50 percent has been replaced by ground granulated basic furnace slag (GGBFS) and 7 percent by silica fume (SF) in other words the mix introduces between about 178 and 228 kg/mtherefore the combination is good to produce secondary reaction products when the cement hydrates which produces secondary calcium silicate hydrate (C&#x2014;S&#x2014;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.

Lightweight concrete

A heavyweight concrete composition comprising cement, steel slag coarse particles, steel slag fine particles, and iron ore aggregate, a wet concrete slurry of water mixed with the heavyweight concrete composition, and a heavyweight concrete which is a cured form of the wet concrete slurry. In the present disclosure, sand, which is used in conventional concretes, is replaced with steel slag fine particles to produce a sand-free heavyweight concrete.

Heavyweight concrete containing steel slag

The present invention discusses methods for making a cement composition comprising a nanoparticle zeolite. The addition of the nanoparticle zeolite may provide enhanced compressive and tensile strengths, improved rheology, and a change to the cement microstructure. These effects may improve the cement's use as a cement sheath in drilling operations and under high pressure and high temperature (HPHT) conditions.

Method for making and curing a hydraulic cement mixture

Method of pumping and curing a cement slurry into a well bore

Nano zeolite cement additive and methods of use

A cement slurry composition, containing hydraulic cement, water, and from 1 to less than 4% of an organically modified nanoclay. A method for cementing a high pressure high temperature well by pumping the cement composition of claimbetween a casing and a formation of a well bore to fill a gap between the casing and the formation, and allowing the cement to harden.

Nanoclay-enhanced cement composition for deep well treatment

Nanoclay as an additive for high pressure and high temperature well cementing

The strut and tie method for waffle slabs relates to computer modeling of waffle slabs to predict strength and mode of failure. The waffle slab strut and tie method utilizes a three-dimensional strut-and-tie model, which is applied to distinct structural features of waffle slabs. Individual ribs in the slab form two-dimensional trusses, which are connected with perpendicular trusses at rib intersections. The geometry of the slab defines the location of nodes for finite element analysis.

Growing community of inventors

Dhahran, Saudi Arabia

Muhammad Kalimur Rahman