Recently, techniques for acquiring, analyzing, and using 3-D shape infonnation for aggregates (sand, gravel) have been developed and demonstrated. These mathematical techniques, based on spherical hannonic coefficient analysis, have been applied to X-ray computed tomography images. X-ray microtomographic images of cement particles are required to be able to apply these same mathematical techniq...

Abstract—This work reports the potential of using Palm Kernel (PK) ash and shell as a partial substitute for Portland Cement (PC) and coarse aggregate in the development of mortar and concrete. PK ash and shell are agro-waste materials from palm oil mills, the disposal of PK ash and shell is an environmental problem of concern. The PK ash has pozzolanic properties that enables it as a partial r...

Summary In oil and gas geothermal well construction, a cementitious material is pumped in the wellbore to provide zonal isolation support casing during life cycle of well. Thus, barrier materials must be durable terms chemical mechanical properties have compatibility with pipe. The complex region casing-cement interface considered key parameter fulfill long-term isolation. This chemically stabl...

Fundamental interactions between polymeric superplasticizers and cement are studied. Cements with different alite-, belite-, C3Aand C4AF-contents are used. The use of commercially available superplasticizers like melamine formaldehyde sulfite(MFS) and β-naphthalene sulfonic acid formaldehyde-(NSF) resins is investigated. These superplasticizers (industrial products) are characterized by means o...

The purpose of this study was to examine the effectiveness of a new glass polyphosphonate cement (Diamond) for orthodontic banding. Thirty-one subjects underwent in vivo testing to compare the failure rate of bands cemented using the test cement and bands cemented using a conventional glass polyalkenoate cement (Ketac-Cem) over a 6-month period at the beginning of active appliance therapy. In a...