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A platform for research: civil engineering, architecture and urbanism
Rapidly-cured pile foundation karst cave backfill soil and preparation method thereof
The invention relates to quickly cured pile foundation karst cave backfill soil and a preparation method thereof. The backfill soil comprises the following components in percentage by weight: 62 to 64 percent of dry soil, 27 to 30 percent of water, 0.6 to 3.2 percent of cement, 3.2 to 6 percent of slag, 0.3 to 1.7 percent of NaSO4 and 0.5 to 1.1 percent of CaO. The preparation method comprises the following steps: adding the cement, the slag, the NaSO4 and the CaO into a mixing container one by one, uniformly mixing, and stirring the dry soil and the curing agent in a stirrer at a low speed for 50-80 seconds; adding water twice for mixing, stirring at a low speed for 50-80 seconds after adding water every time, stopping stirring for 10-20 seconds, and then stirring at a high speed for 40-50 seconds to obtain a mixture; and finally, performing compression molding and natural curing on the mixture, and obtaining the pile foundation karst cave backfill soil. Compared with the prior art, the preparation method has the advantages of being simple, low in raw material cost and the like, and the anhydrous sodium sulfate and the calcium oxide are added to destroy a slag glass body structure and a slag surface silicon-oxygen network structure protective film and accelerate slag hydration, so that the curing rate and the backfill strength are improved.
本发明涉及一种快速固化的桩基溶洞回填土及其制备方法，其中回填土包括以下组分及重量百分含量：干土62‑64％，水27‑30％，水泥0.6‑3.2％，矿渣3.2‑6％，NaSO4 0.3‑1.7％，CaO 0.5‑1.1％；制备方法包括：首先将水泥、矿渣、NaSO4、CaO逐一加入至混合容器中，并混合均匀，再将干土与固化剂置于搅拌机中低速搅拌50‑80s；之后分两次加水混合，每次加水后先低速搅拌50‑80s，再停拌10‑20s，之后再高速搅拌40‑50s，得到混合料；最后将混合料压模成型，并自然养护，即得到桩基溶洞回填土。与现有技术相比，本发明具有制备方法简单、原料成本低等优点，通过加入无水硫酸钠与氧化钙，以破坏矿渣玻璃体结构以及矿渣表面硅氧网络结构保护膜，加速矿渣水化，从而提高固化速率与回填土强度。
Rapidly-cured pile foundation karst cave backfill soil and preparation method thereof
The invention relates to quickly cured pile foundation karst cave backfill soil and a preparation method thereof. The backfill soil comprises the following components in percentage by weight: 62 to 64 percent of dry soil, 27 to 30 percent of water, 0.6 to 3.2 percent of cement, 3.2 to 6 percent of slag, 0.3 to 1.7 percent of NaSO4 and 0.5 to 1.1 percent of CaO. The preparation method comprises the following steps: adding the cement, the slag, the NaSO4 and the CaO into a mixing container one by one, uniformly mixing, and stirring the dry soil and the curing agent in a stirrer at a low speed for 50-80 seconds; adding water twice for mixing, stirring at a low speed for 50-80 seconds after adding water every time, stopping stirring for 10-20 seconds, and then stirring at a high speed for 40-50 seconds to obtain a mixture; and finally, performing compression molding and natural curing on the mixture, and obtaining the pile foundation karst cave backfill soil. Compared with the prior art, the preparation method has the advantages of being simple, low in raw material cost and the like, and the anhydrous sodium sulfate and the calcium oxide are added to destroy a slag glass body structure and a slag surface silicon-oxygen network structure protective film and accelerate slag hydration, so that the curing rate and the backfill strength are improved.
本发明涉及一种快速固化的桩基溶洞回填土及其制备方法，其中回填土包括以下组分及重量百分含量：干土62‑64％，水27‑30％，水泥0.6‑3.2％，矿渣3.2‑6％，NaSO4 0.3‑1.7％，CaO 0.5‑1.1％；制备方法包括：首先将水泥、矿渣、NaSO4、CaO逐一加入至混合容器中，并混合均匀，再将干土与固化剂置于搅拌机中低速搅拌50‑80s；之后分两次加水混合，每次加水后先低速搅拌50‑80s，再停拌10‑20s，之后再高速搅拌40‑50s，得到混合料；最后将混合料压模成型，并自然养护，即得到桩基溶洞回填土。与现有技术相比，本发明具有制备方法简单、原料成本低等优点，通过加入无水硫酸钠与氧化钙，以破坏矿渣玻璃体结构以及矿渣表面硅氧网络结构保护膜，加速矿渣水化，从而提高固化速率与回填土强度。
Rapidly-cured pile foundation karst cave backfill soil and preparation method thereof
一种快速固化的桩基溶洞回填土及其制备方法
ZHOU QING (author) / TIAN QIUHUA (author) / ZHOU BIN (author) / WANG DEMIN (author) / HU JINXIONG (author)
2021-09-10
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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