Experimental Study and Modeling of the Fracture Behavior, Mechanical Properties, and Bonding Strength of Oil Well Cement

Review Chemistry, Multidisciplinary

An Insight into the Chemistry of Cement-A Review

Luca Lavagna et al.

Summary: Even though cement is a well-consolidated material, its chemistry remains complex and non-obvious. The hydration mechanism plays a crucial role in developing cement with specific compositions, properties, and porosities. This document provides a survey of the chemistry behind cement and discusses topics such as the manufacture process, chemical reactions, setting mechanisms, porosity classification, and the use of recycled waste materials. It highlights the influence of water on chemical transformations in cement, the role of water in porosity formation, and the potential of sustainable cementitious formulations using waste materials.

APPLIED SCIENCES-BASEL (2023)

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Article Construction & Building Technology

Micro-macro characterizations of mortar containing construction waste fines as replacement of cement and sand: A comparative study

Huixia Wu et al.

Summary: This study compares the micro-macro characteristics of sustainable mortar using construction waste fines as cement and sand replacement. The results show that waste concrete fines (WCF) and waste brick fines (WBF) exhibit pozzolanic activity, nucleation, and micro-aggregate filling effects. Replacing cement with WCF increases the porous structure while replacing with moderate WBF refines the pore structure; moreover, substituting WCF/WBF for sand refines the pore structure. Using appropriate WCF/WBF as cement replacement reduces drying shrinkage, but using them as sand replacement increases it. Incorporating WCF reduces the strength and permeability resistance, while the addition of WBF first improves and then declines these properties. Mixing WCF and WBF as sand replacement enhances the strength and permeability resistance. WBF blended mortar exhibits superior properties, and substituting WCF/WBF for both cement and sand can prepare sustainable mortar with similar or superior properties to plain mortar.

CONSTRUCTION AND BUILDING MATERIALS (2023)

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Article Construction & Building Technology

Crack evolution characteristics of cemented-gangue-fly-ash backfill with different proportions of fly ash and cement

Guorui Feng et al.

Summary: The basic bearing capacity and failure performance of cemented-gangue-fly-ash backfill (CGFB) with different fly ash to cement ratios were explored through various tests. The results showed that CGFB has a maximum strength of 15.35 MPa, which varies significantly with different ratios. The brittleness of CGFB decreases as the ratio increases. The failure mode changes from tensile to shear, and the crack initiation stress decreases with the increase in ratio.

CONSTRUCTION AND BUILDING MATERIALS (2023)

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Article Energy & Fuels