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Controllable low-strength material
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A low-intensity, raw-material technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., to achieve the effect of saving natural resources and reducing land occupation
Inactive Publication Date: 2018-06-26
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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[0007] In order to solve the problem of making CLSM (controllable low-strength material) by utilizing the increasing construction waste at present, the invention provides a kind of controllable low-strength material, which is made by mixing the following raw materials: construction waste soil, construction waste regeneration fine aggregate, fly ash, cement and water; the construction waste soil is the soil-containing waste produced when the construction waste disposalplant produces recycled aggregate; the construction waste regenerated fine aggregate is crushed and processed from construction waste Particles not larger than 4.75mm
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Embodiment 1
[0025] This embodiment provides a controllable low-strength material. In the ratio of raw materials, the sum of the mass of construction spoil, recycled fine aggregate of construction waste and fly ash is M, wherein the mass of fly ash is 20%. *M, the quality of recycled fine aggregate of construction waste is 75%*M, the quality of construction spoil is 5%*M, the quality of cement is set to 8%*M, and the quality of added water is 24%*M.
[0026] The preparation method of the controllable low-strength material is as follows:
[0027] During the stirring process, control the stirring speed of the mixer to 445-460r / min; first add water with a mass of 24%*M, then add construction spoil with a mass of 5%*M, and stir for 5 minutes; then add 20% *M of fly ash and 75%*M of construction waste regenerated fine aggregate, and then stir for 5 minutes; finally add cement with a mass of 8%*M, and continue to stir for 5 minutes to obtain a CLSM mixture. The fluidity of the obtained CLSM mix...
Embodiment 2-3
[0029] Embodiment 2-3 and embodiment 1 identical raw material and steps are all identical, and difference is only in the quality ratio of construction spoil, construction waste regenerated fine aggregate, fly ash, cement and water, concrete mixing ratio and the CLSM that obtains The basic performance is shown in Table 1:
[0030] Table 1 Proportion of different fly ash, recycled fine aggregate from construction waste, construction spoil, cement and water
[0031]
[0032] Among them, M is the sum of the mass of construction spoil, recycled fine aggregate of construction waste and fly ash. During the proportioning process, the sum of the mass of construction spoil, recycled fine aggregate of construction waste and fly ash is generally fixed, and the mass ratio of construction spoil, recycled fine aggregate of construction waste, fly ash, cement and water is adjusted.
[0033] Wherein, embodiment 1 is the situation of the mass ratio of construction spoil, construction waste ...
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Abstract
The invention provides a construction spoil recyclable controllable low-strength material (CLSM) and application. The construction spoil recyclable CLSM is formed by construction spoil, construction waste reclaimed fine aggregate, fly ash, cement and water. The construction spoil is a soil-containing waste material generated when a construction waste recycling plant produces construction waste recycled aggregate; and the construction waste recycled fine aggregate is particles with a size of no more than 4.75 mm which is processed by crushing construction waste. The controllable low-strength material is a mixture with self-leveling characteristics, and its 28d unconfined compressive strength is 1.2-8.4 MPa. The CLSM has certain unconfined compressive strength after hydration, can replace atraditional backfill material, and can also be used for a road base layer and a sub-base; at the same time, the current increasing construction spoil and construction waste are effectively utilized, land occupation is reduced, and natural resources are saved.
Description
technical field [0001] The invention relates to the field of construction waste utilization, in particular to a controllable low-strength material. Background technique [0002] Controlled low-strength material (CLSM) is a kind of cement-based low-fill material that has high fluidity and can be self-filled without or with a little vibration under its own weight to form a self-compacting structure. Strength backfill material. The American Concrete Institute (ACI 116R) defines CLSM as a material with a 28d compressive strength not greater than 8.3MPa (1200psi). Controllable low-strength material is a general term for a series of low-strength materials with different uses, including controllable density fill (CDF), flowable mortar (flowable fill), flowable fill material (lean mix back-fill) ), poor cement backfill materials and other nicknames. [0003] The salient features of controllable low-strength materials are high fluidity, self-leveling and low strength, with wide so...
Claims
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