Research on the Development and Joint Improvement of Ceramsite Lightweight High-Titanium Heavy Slag Concrete Precast Composite Slab

Abstract

Despite the continuous improvement in the research and development of concrete precast composite slab technology, problems like easy cracks and excessive weight at the joints remain. In this study, high-titanium heavy slag was mixed with different kinds of ceramsite to prepare ceramsite lightweight high-titanium heavy slag concrete. The joint of the composite slab was optimized to develop a novel ceramsite lightweight high-titanium heavy slag concrete precast composite slab, hereinafter referred to as “CLHCPCS”. Two CLHCPCS and one ordinary concrete composite slab were prepared. This study analyzed the effects of new materials and improved joints on the flexural capacity and crack resistance of CLHCPCS. It concluded that the density of high-titanium heavy slag concrete with shale ceramsite decreased by 12.0%, and the density of high-titanium heavy slag concrete with fly ash ceramsite decreased by 10.6%. At a 30% dosage of fly ash ceramsite, the compressive strength and splitting tensile strength of concrete reached the maximum. At a 20% dosage of shale ceramsite, the mechanical properties were optimal. Finally, fly ash ceramsite was selected as part coarse aggregate of CLHCPCS. CLHCPCS 1 and 2 demonstrated superior ultimate bearing capacity and crack resistance than ordinary concrete composite slab DBS1, with its ultimate bending capacity test value higher than the average value of ordinary concrete composite slab. ANSYS established the joint model of CLHCPCS for a bending simulation test. The stress and strain distribution of the model and the ultimate bending capacity under the plastic line method were obtained, consistent with theory and experimental analysis results.

Experimental Study on Flexural Behavior of RC–UHPC Slabs with EPS Lightweight Concrete Core

“…Buildings 2023, 13, x FOR PEER REVIEW 8 of 14 that the UHPC layer has a good effect in limiting the widening of the crack width by forming other cracks, unlike normal concrete, as shown in the literature [1,29]. In addition, the bonding between the concrete layers is very good, allowing different layers of materials to work simultaneously.…”

Study on the Performance and Green Degree Evaluation of the Reference Cement–Sulfoaluminate Cement Composite System

“…Special cements mainly include high-alumina cement, sulfoaluminate cement, and ferroaluminate cement [7][8][9][10][11]. This paper aims to develop an early strength and low-carbon [12][13][14] cementitious material system by adding sulfoaluminate cement to the cementitious system. The production of tricalcium silicate emits 1.80 g/ml of carbon dioxide, while the production of tetracalcium sulfoaluminate is only 0.52 g/ ml [15], and some low-cost raw materials or wastes can be used for the production of raw materials [16].…”