Dongxing Xuan

Compressive and Indirect Tensile Strengths of Cement-Treated Mix Granulates with Recycled Masonry and Concrete Aggregates

AbstractReuse of construction and demolition waste (CDW) as a road base material is one of the effective methods to reduce environmental effects caused by CDW dumping in landfills. To explore the feasibility to reuse CDW as a cement-treated material, this paper investigated the compressive and indirect tensile strengths of cement-treated demolition waste. Because the recycled CDW is a mix of recycled masonry and concrete, different ratios of recycled crushed masonry-concrete aggregates by mass were chosen in this study. Four mixture variables (cement content, degree of compaction, masonry content, and curing time) and their influence on the mechanical properties of cement-treated mix granulates (CTMiGr) were then considered. Experimental results showed that a general model to estimate the compressive and indirect tensile strengths of CTMiGr can be established in relation to those four mixture variables. Compared with normal cement-treated granular materials, the masonry content is another unique factor to...

Estimation of Mechanical Characteristics of Cement Treated Demolition Waste

Cement treated granular materials have been applied for pavement bases and subbases. The availability of prediction models that allow their mechanical properties to be estimated from material parameters like composition and degree of compaction would be extremely useful because it would overcome the need for extensive testing. This paper presents an experimental study on establishing models to estimate the mechanical properties of cement treated mix granulates with recycled crushed masonry and concrete aggregates (CTMiGr). Mechanical properties include compressive strength, indirect tensile strength and elastic modulus. Variables influencing the strength and the elastic modulus, such as the ratio of crushed masonry to crushed concrete, the cement content, the water content and the degree of compaction were considered during the mixture preparation of CTMiGr. The experimental results show that the compressive strength, the indirect tensile strength and the elastic modulus of CTMiGr after 28 days of curing may be accurately estimated on basis of the content of recycled masonry, the ratio of cement to water and the dry density.