收缩率
厚板
相对湿度
材料科学
湿度
压力(语言学)
岩土工程
阶段(地层学)
复合材料
水分
结构工程
地质学
气象学
工程类
哲学
古生物学
物理
语言学
作者
Jun Zhang,Dongwei Hou,Yuan Gao
出处
期刊:Journal of transportation engineering
[American Society of Civil Engineers]
日期:2013-10-01
卷期号:139 (10): 961-970
被引量:16
标识
DOI:10.1061/(asce)te.1943-5436.0000509
摘要
This paper focuses on modeling of the distribution of shrinkage strain in early-age concrete pavements. In the modeling, an integrative model for autogenous and drying shrinkage predictions of concrete at an early age is introduced first. Second, a model taking both cement hydration and moisture diffusion into account synchronously is used to calculate the distribution of the interior humidity in concrete. The previous two models are experimentally verified independently by a series of shrinkage and interior humidity tests on three types of concretes with different compressive strengths. Using the models, the distribution of shrinkage strain in early-age concrete pavement (with respect to drying of the pavement surface) is calculated. The model results show the development of interior humidity inside of the pavement because the concrete cast obeys a two-stage mode, i.e., a vapor-saturated stage with 100% relative humidity (Stage 1) and a stage with the relative humidity gradually decreasing (Stage 2). The duration of Stage 1 increases with respect to the location, i.e., from the slab top to bottom. Within Stage 1, a uniform shrinkage strain is expected throughout the slab. By contrast, the shrinkage gradient along the slab depth is obvious in Stage 2. The maximum and minimum shrinkages occur at the slab top and bottom, respectively. The distribution of the shrinkage strain along the pavement depth is nonlinear and the nonlinearity is strong where it is close to the drying face. Concrete strength can significantly influence the magnitude of the shrinkage strain within the slab. For a given age and location, an increased concrete strength corresponds with an increased shrinkage strain and shrinkage gradient.
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