Abstract
This paper mainly studies the effect of cast‐in‐situ phosphogypsum on seismic behaviour of reinforced concrete grid frame. The mechanical behaviour of three reinforced concrete grid frames and four cast‐in‐situ phosphogypsum‐reinforced concrete grid frame composite walls under low cycle alternating load was designed and tested. The test results show that the reinforced concrete grid frame has less bearing capacity and poor energy consumption. The addition of cast‐in‐situ phosphogypsum can effectively improve the seismic behaviour of the reinforced concrete grid frame. Compared with the reinforced concrete grid frame, the bearing capacity of the cast‐in‐situ phosphogypsum‐reinforced concrete grid frame composite wall is increased by 2‐3 times, the displacement ductility coefficient is increased by 0.95∼1.2 times, and the relative accumulative energy consumption is increased by 86%∼216%. This shows that the composite wall has better bearing capacity, ductility, and energy dissipation capacity.
Highlights
Phosphogypsum is a solid waste discharged from the production of phosphoric acid by wet process
The utilisation of phosphogypsum mainly focuses on the following aspects [3]: (i) Most of techniques used in the chemical industry require phosphogypsum before treatment, which comes with high investment, high energy consumption, and new emissions
(iii) Phosphogypsum and phosphorus slag were used as cementitious materials for cemented paste backfill body to treat goafs in mines [5], but it is unsuitable for open-cast mines
Summary
Phosphogypsum is a solid waste discharged from the production of phosphoric acid by wet process. It is proposed that the quality ratio of raw materials is as follows: 80% phosphogypsum, 17% phosphorus slag powder, 3% CaO, 2% cement, 0.8% water reducer, 0.22%–0.35% retarder, and 0.43–0.46 water-to-cement ratio, which effectively solves the aforementioned problems On this basis, Wu et al [13] measured the uniaxial stressstrain curve of phosphogypsum through prismatic specimens and revealed that the elastic modulus of the material was 5300 MPa and Poisson’s ratio was 0.19. E ratio of concrete and phosphogypsum in the structure is 1 : 0.71, which indicates that a large number of applications of phosphogypsum can be realized in the building structure According to this project, the construction technology of cast-in-situ phosphogypsum-reinforced concrete grid frame composite wall can be summarized as follows. The seismic performance of reinforced concrete grid frame and cast-in-situ phosphogypsum-reinforced concrete grid frame composite wall is compared and tested to understand the structural failure characteristics, bearing capacity, hysteretic curve, skeleton curve, ductility, stiffness, energy dissipation, and other seismic performances
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