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Title:

Curing Regime Effect on Engineering Characteristics of Controlled Low Strength Material

Accession Number:

01698441

Record Type:

Component

Abstract:

This paper presents emerging findings from a study of controlled low-strength material (CLSM) to evaluate its feasibility for various civil engineering applications including pavement bases. A mortar mix containing a high proportion of pozzolan was evaluated for engineering properties at water-cementitious ratios of 1.0, 0.9 and 0.8, and cured at different regimes incorporating both relative humidity and temperature. These mix designs were tested for constructability (flowability) and mechanical properties including compressive strength, shrinkage, and setting time. In this study, two different continuous curing regimes were used for each CLSM mix until the specimens were tested for compressive strength and shrinkage. The two regimes are 100% Relative Humidity (RH) and a temperature of 70°F (21.1ºC), and 50% RH and a temperature of 70°F (21.1ºC). Each curing regime included specimens that, after 7 days, were kept within and outside of the plastic mold until the day of the test. Results from compressive strength tests show that specimens cured at 100% RH always provide higher ultimate strength and rate of strength gain for specimens kept both within and out of the mold when compared to specimens cured at 50% RH. The compressive strength increased significantly as the water:cementitious material (w:cm) ratio decreased from 1.0 to 0.8 in each curing regime. Results from the bar linear shrinkage tests showed that shrinkage strain at 50% RH curing was significantly higher than those cured at 100% RH for all mix designs tested. Tests conducted to study the effect of curing temperature and w:cm ratio on setting time showed that CLSM sets faster as curing temperature increased from 50°F (10ºC) to 90°F (32.2ºC), and when w:cm ratio decreased from 1.0 to 0.8.

Supplemental Notes:

This paper was sponsored by TRB committee AFN40 Standing Committee on Concrete Materials and Placement Techniques.

Report/Paper Numbers:

19-03756

Language:

English

Corporate Authors:

Transportation Research Board

Authors:

Okuyucu, Osman
Jayawickrama, Priyantha W
Senadheera, Sanjaya

Pagination:

17p

Publication Date:

2019

Conference:

Transportation Research Board 98th Annual Meeting

Location: Washington DC, United States
Date: 2019-1-13 to 2019-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2019 Paper #19-03756

Files:

TRIS, TRB, ATRI

Created Date:

Dec 7 2018 9:38AM