再生细骨料对超高性能混凝土的力学与自收缩性能影响

doi:10.19964/j.issn.1006-4990.2023-0472

Abstract

Abstract:

The application of recycled fine aggregate to ultra-high performance concrete（UHPC） not only reduces its cost，but also realizes the resource utilization of construction waste.UHPC was prepared by pre-wet recycled fine aggregate（RFA）.The effects of particle sizes（0.6~<1.18 mm and 1.18~2.36 mm） and replacement rates（10%，20%，30% and 40% of volume fraction） of pre-wetted treatment RFA on working performance，mechanical properties，volume stability and chloride ion penetration resistance of UHPC were investigated.The mechanism was revealed by microhardness，TG-DTG，MIP and SEM.The results showed that the particle size and content of recycled fine aggregate were the key factors that determined the workability，mechanical properties and shrinkage properties of UHPC.With the increase of RFA content，the fluidity and autougenous shrinking of UHPC were decreased gradually.But its compressive strength showed a trend of increasing firstly and then decreasing，among which UHPC prepared with 20% pre-wetted recycled fine aggregate（particle size of 1.18~2.36 mm） showed better performance.Compared with the control group，the 28 days compressive strength was increased by 7.0%，while the autougenous shrinking was decreased by 78.8%.The pre-wetted RFA released water into the UHPC matrix，reduced the internal self-drying process，and improved the degree of hydration reaction，which optimized the interface composition structure，and thus refined the internal pores of the matrix.

Key words: ultra-high performance concrete, recycled fine aggregate, mechanical properties, autougenous shrinkage, pore structure

CLC Number:

TQ127.2

LIU Cijun, WU Ziyang, CHENG Shukai, CHEN Xuyong. Effect of recycled fine aggregate on mechanical properties and autogenous shrinkage of ultra-high performance concrete[J]. Inorganic Chemicals Industry, 2024, 56(9): 75-81.

Figures/Tables 13

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样品	水泥/ （kg·m^-3）	硅灰/ （kg·m^-3）	粉煤灰/ （kg·m^-3）	石英砂/ （kg·m^-3）	石英粉/ （kg·m^-3）	再生细骨料/ （kg·m^-3）	水/ （kg·m^-3）	钢纤维/ （kg·m^-3）
REF	650	250	100	1 000.0	150	0.0	180.0	156
RS10	650	250	100	901.7	150	98.3	168.7	156
RS20	650	250	100	802.4	150	197.6	157.4	156
RS30	650	250	100	705.2	150	294.8	146.4	156
RS40	650	250	100	606.9	150	393.1	135.1	156
RM10	650	250	100	904.4	150	95.6	170.3	156
RM20	650	250	100	808.8	150	191.2	160.6	156
RM30	650	250	100	713.2	150	286.8	150.9	156
RM40	650	250	100	617.6	150	382.4	141.2	156

样品	w（结晶水）/%	w［Ca（OH）₂］/%	w（CaCO₃）/%
REF	7.08	0.65	1.89
RS20	8.95	0.82	3.12
RM20	9.65	0.84	3.22

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Effect of recycled fine aggregate on mechanical properties and autogenous shrinkage of ultra-high performance concrete

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