Study on Phosphorus Building Gypsum Properties Reinforced with Basalt Fiber and Calcium Carbonate Whisker
In order to overcome the poor mechanical properties of phosphorus building gypsum,basalt fiber(BF)and calcium carbonate whisker(CW)are selected as reinforcing materials.The variation of flexural and compressive strength,toughness,water resistance and tensile strength of phosphorus building gypsum are studied by only adding BF and mixing BF and CW in phosphorus building gypsum.The results show that the addition of 6 mm and 9 mm BF has a better enhancement effect on the performance of phosphorus building gypsum.When the content of 6 mm BF is 1.5%,the flexural and compressive strength is 92.2%and 32.0%higher than that of the blank group without BF.When 1.5%9 mm BF is added,the toughness is 76.9%higher than that of the blank group without BF,and the tensile strength is increased by 31.1%.The incorporation of different scales of BF will reduce the water resistance of phosphorus building gypsum.When the BF content of 6 mm is fixed at 1.5%and 1.0%CW is added,the flexural strength of phosphorus building gypsum is 9.6%higher than that of the BF test group with 1.5%6 mm BF.When the CW content is increased to 2.0%,the toughness of phosphorus building gypsum is 27.7%higher than that of the BF test group with 1.5%6 mm BF.The combination of CW and BF is helpful to improve the ul-timate tensile stress and strain of phosphorus building gypsum.The phosphorus building gypsum mixed with 1.0%6 mm BF and 1.0%CW,mixed with 1.0%6 mm BF and 2.0%CW has a certain pseudo strain strengthening effect during the tensile process,and the maximum tensile strain exceeds 1.2%.The simultaneous increase of CW and BF dosage will increase the po-rosity of phosphorus building gypsum,resulting in compressive strength decrease.
phosphorous building gypsumbasalt fibercalcium carbonate whiskermechanical propertieswater resist-ance
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