Investigation of the bond strength and microstructure of the interfacial transition zone between cement paste and aggregate modified by Bayer red mud

2021 ◽  
Vol 403 ◽  
pp. 123482
Author(s):  
Xianhai Li ◽  
Qin Zhang ◽  
Song Mao
Keyword(s):  
Bond Strength ◽  
Transition Zone ◽  
Cement Paste ◽  
Red Mud ◽  
Interfacial Transition Zone ◽  
Bayer Red Mud

scholarly journals Effect of water/cement ratio on micro-nanomechanical properties of the interface between cementitious matrix and steel microfibers in ultra-high performance cementitious composites

2021 ◽  
Vol 14 (4) ◽  
Author(s):  
Vanessa Fernandes Cesari ◽  
Fernando Pelisser ◽  
Philippe Jean Paul Gleize ◽  
Milton Domingos Michel
Keyword(s):  
Transition Zone ◽  
Cement Paste ◽  
Calcium Silicate ◽  
High Performance ◽  
Calcium Silicate Hydrate ◽  
Interfacial Transition Zone ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Nanomechanical Properties ◽  
Cementitious Matrix

abstract: Ultra-high performance concretes with steel microfibers have been studied in depth with the aim of producing more efficient and durable structures. The performance of these materials depends on the characteristics of the interface between microfibers and cementitious matrix. This research investigates the micro-nanomechanical properties of the interfacial transition zone between the steel microfibers and the matrix of ultra-high performance cementitious composite. The effect of the water/cement ratio and distance from the microfiber were analyzed. The results confirm the formation of high-density calcium-silicate-hydrate (HD C-S-H) matrix at higher concentrations than low-density calcium-silicate-hydrate (LD C-S-H) for w/c ratios of 0.2 and 0.3. The properties in cementitious matrix interface with steel microfibers were very similar to that measured for the cement paste, and no significant difference was observed regarding the distance to the microfibers in relation to the elastic modulus, hardness and chemical composition. Thus, the authors can conclude that the formation of a less resistant region does not occur at the interfacial transition zone cement paste/microfibers.

Experimental Study of Diffusivity of the Interfacial Transition Zone between Cement Paste and Aggregate

2016 ◽  
Vol 28 (10) ◽  
pp. 04016109 ◽  
Author(s):  
Zhilu Jiang ◽  
Qinghua Huang ◽  
Yunping Xi ◽  
Xianglin Gu ◽  
Weiping Zhang
Keyword(s):  
Experimental Study ◽  
Transition Zone ◽  
Cement Paste ◽  
Interfacial Transition Zone

scholarly journals Effect propylene glycol as a quality improvers for Portland and Portland-limestone cements

2019 ◽  
Vol 4 (1) ◽  
pp. 1-7
Author(s):  
Hashem FS ◽  
Eisa E Hekal ◽  
Abdel M Wahab
Keyword(s):  
Mechanical Properties ◽  
Propylene Glycol ◽  
Transition Zone ◽  
Cement Paste ◽  
Cement Hydration ◽  
Interfacial Transition Zone ◽  
Setting Times ◽  
Sand Particles

The performance of propylene glycol (PG) on the grindability, setting and hardening of Portland (OPC) and Portland-Limestone cements (PLC) was studied. Propylene glycol was added to OPC clinker with percentage ratios; 0, 0.03, 0.04 and 0.05 wt.% of the OPC clinker. PLC was made by replacing 5 and 10 wt. % of OPC with limestone. PG offers better grinding aid performance with higher Blaine areas. Besides, presence of PG shows higher water of consistency and lower initial and final setting times. The mechanical properties of mortar specimens made from OPC and PLC admixed with PG were improved especially in the first 7 days. This explained due to increase in the cement fineness which leads to an increase in the degree of cement hydration, as well as to improvement in the interfacial transition zone between the cement paste and sand particles, thus resulting in an enhancement in the strength. DTA and SEM results confirmed the improved properties achieved due to admixing OPC or PLC with PG.

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