volumes of fly ash could replace cement partially to produce low-cost, environmentally friendly and durable grouts. This paper
presents the results of the particle size distribution, three rheological properties (flow time, bleeding and setting time), and five
mechanical and strain properties (compressive strength, shear bond strength, modulus of elasticity, Poisson’s ratio and drying
shrinkage) of high-volume fly-ash (HVFA) grouts (cement replacement by fly ash of over 55% by weight), with and without
superplasticizer (SP) andyor anti-washout agent (AWA). Rheological properties are reported for eight water–cementitious materials
(cementqfly ash) ratios (WyCM), ranging from 0.4 to 1.3, whereas mechanical and strain properties of hardened grouts are
given at WyCM of 0.5, 0.55 and 0.65. The effects of SP and AWA on the flow time of low-WyCM grouts and the stability of
high-WyCM grouts were investigated. The results indicate that the addition of fly ash in cement grouts reduces the flow time,
improves stability, reduces drying shrinkage, and attains similar compressive and shear bond strengths as pure cement grouts
at later ages. Moreover, when SP is used for low-WyCM grouts, the latter destabilizes, and in those cases AWA should be used.
2002 Elsevier Science Ltd. All rights reserved.
volumes of fly ash could replace cement partially to produce low-cost, environmentally friendly and durable grouts. This paperpresents the results of the particle size distribution, three rheological properties (flow time, bleeding and setting time), and fivemechanical and strain properties (compressive strength, shear bond strength, modulus of elasticity, Poisson’s ratio and dryingshrinkage) of high-volume fly-ash (HVFA) grouts (cement replacement by fly ash of over 55% by weight), with and withoutsuperplasticizer (SP) andyor anti-washout agent (AWA). Rheological properties are reported for eight water–cementitious materials(cementqfly ash) ratios (WyCM), ranging from 0.4 to 1.3, whereas mechanical and strain properties of hardened grouts aregiven at WyCM of 0.5, 0.55 and 0.65. The effects of SP and AWA on the flow time of low-WyCM grouts and the stability ofhigh-WyCM grouts were investigated. The results indicate that the addition of fly ash in cement grouts reduces the flow time,improves stability, reduces drying shrinkage, and attains similar compressive and shear bond strengths as pure cement groutsat later ages. Moreover, when SP is used for low-WyCM grouts, the latter destabilizes, and in those cases AWA should be used. 2002 Elsevier Science Ltd. All rights reserved.
การแปล กรุณารอสักครู่..