This paper include flaws in the sewerage system of model town Lahore and surrounding areas. By keeping in mind these minor things we can design a better model for such societies.
The utilization of construction and demolition waste is useful for sustainable infrastructure development and protecting the environment. In this research, the properties of self-compacting concrete produced by replacing the natural... more
The utilization of construction and demolition waste is useful for sustainable infrastructure development and protecting the environment. In this research, the properties of self-compacting concrete produced by replacing the natural coarse aggregates (NCA) with inferior recycled coarse aggregates (RCA) were investigated. The properties of self-compacting concrete (SCC) and self-compacting mortar (SCM) with varying replacements of RCA (0, 25, 50, and 100%) in NCA were determined. The flow, strength, early shrinkage tests, and microstructure using X-ray diffraction (XRD) and a scanning electron microscope (SEM) were investigated. The fresh property results indicated that the viscosity of freshly mixed SCC increased with higher replacement levels of RCA, thus reducing flow. The compressive strength of RCA SCC was reduced up to 30% for a 100% replacement level, while the flexural strength was reduced by about 15%. The compressive strength and flexural strength of SCMs, however, increase...
Self-compacting paste (SCP) systems are the vehicles for the transport of aggregates within selfcompacting mortar and concrete systems. SCP systems incorporating different types of cements and secondary raw materials (SRM’s) were studied... more
Self-compacting paste (SCP) systems are the vehicles for the transport of aggregates within selfcompacting mortar and concrete systems. SCP systems incorporating different types of cements and secondary raw materials (SRM’s) were studied for SRM particle characteristics and powder parameters including water demand (WD), setting times and flow. Strength, early volume stability and microstructure of SCP systems are also reported. The results showed that SRM particle characteristics have a significant bearing on the system’s WD, super-plasticizer demand (SPD), strength and microstructure. Inclusion of pozzolanic SRM’s in SCP systems as ten per cent cement replacements increased the strength and durability due to three parallel operative mechanisms of filler (physical), hydration and pozzolanic actions (chemical).
A study has been carried out on self-compacting paste (SCP) systems using various cements and secondary raw materials (SRM's) including rice husk ash (RHA) and Silica Fume (SF). These systems were characterized by SRM particle size,... more
A study has been carried out on self-compacting paste (SCP) systems using various cements and secondary raw materials (SRM's) including rice husk ash (RHA) and Silica Fume (SF). These systems were characterized by SRM particle size, powder water demand (WD) and setting times, flow, strength, microstructure and early volume stability. The results show that WD increased by adding SRM's due to their smaller particle size, higher surface areas and internal porosity. Inclusion of SRM's in SCP systems as cement replacements also increases strength of SCP systems due to filler, hydration and pozzolanic actions which translate into pore refinement. It is demonstrated that the resultant properties of self-compacting cementitious systems (SCCS) depend upon the nature of SRM used.
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with... more
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright
An interesting study is reported on establishing secret mining activity resulting in severe ground subsidence which occurred and was corrected later in a village called Dhery Saydan located near the world famous salt range region of... more
An interesting study is reported on establishing secret mining activity resulting in severe ground subsidence which occurred and was corrected later in a village called Dhery Saydan located near the world famous salt range region of Pakistan and is located on a hill top with about 2000 inhabitants. After reviewing many cases of similar nature and on basis of geophysical techniques like resistivity survey, it was established that secret mining activity had taken place resulting in massive cracking of dwellings coupled with sinking of water table. Thereafter a suitable construction methodology was applied to correct the huge structural defects and make the dwellings functional.
The authors report on a study in which different secondary raw material (SRM) types were used at high cement replacement levels on 15 self-consolidating mortar (SCM) series. SCM early volume stability, microstructure, strength... more
The authors report on a study in which different secondary raw material (SRM) types were used at high cement replacement levels on 15 self-consolidating mortar (SCM) series. SCM early volume stability, microstructure, strength development, and flow behavior, as well as SRM particle characterization, are discussed. A simple SCM strength quantification procedure which uses various SRMs has been suggested. The significant roles SRM surface porosity and morphology, size, and shape play in determination of SCM water and high-range water-reducing admixture demand are demonstrated in this study. Understanding results of various routine SCM system tests can also be aided by SRM characterization. Using the comparative tests as a basis, the statement can be made that for self-consolidating cementitious systems, limestone powder (LSP) is not the best SRM. Good SRMs for improved overall SCM response using well-graded aggregates can be found in suitable blends of LSP, silica fume, or fly ash.
