A kind of underground engineering concrete for shield construction and its preparation method and application
An underground engineering and concrete technology, applied in the field of concrete, can solve the problems of high cost and failure to take into account impact resistance, etc.
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Embodiment 1
[0032] To explore the influence of the degree of water glass solution on the mechanical properties of UE concrete, after calculation, mix the clear water glass with a degree n of 3.1-3.3 and pure strong alkali in a certain proportion to obtain the water glass solution of the corresponding degree (see Table 2) , The compressive strength values of each age are obtained under different degrees of water glass, as shown in Table 1.
[0033] The compressive strength values of different ages are obtained under different degrees of water glass in table 1
[0034]
[0035] It can be seen from Table 1 that the degree of water glass is an important factor affecting the mechanical properties of UE concrete. The intensity difference of the cementitious material prepared by the water glass between 1.0~2.0 degree is not big, shows the strength obviously higher than the strength of the cementitious material prepared by the water glass whose degree exceeds 2.0, wherein when the degree o...
Embodiment 2
[0037] Effect of mix ratio of composite cementitious materials on performance of UE concrete.
[0038] On the basis of ensuring the working performance, fix the ratio of liquid to glue, the amount of active water reducer, change the ratio of mineral powder, fly ash, cement, silica fume, and calcium zeolite powder, and pour it into 100*100 after stirring for 2 minutes with a mixer *100mm 3 In the cube mold, the vibrating rod is vibrated and cured under normal temperature and pressure. The vibrating rod is vibrated and cured under normal temperature and pressure. Strength test, the results are shown in Table 2.
[0039] Table 2 Effects of different composite cementitious material mix ratios on the performance of UE concrete
[0040] mineral powder fly ash cement Silica fume Calcium zeolite powder 6 hours strength (MPa) 0.6 0.1 0.1 0.1 0.1 45.2 0.6 0 0.2 0.1 0.1 50.3 0.5 0 0.2 0.15 0.05 51.5
Embodiment 3
[0042] The effect of alkali content on the performance of UE concrete.
[0043]By fixing the degree of water glass, the proportion of composite powder, and the ratio of liquid to glue, the influence of the amount of alkali in the active water reducer on the early strength is changed. After stirring for 2 minutes, pour it into 100*100*100mm 3 In the cube mold, it is cured at normal temperature and pressure, vibrating with a vibrating rod, and cured at normal temperature and pressure. After curing at normal temperature and demoulding, the cube specimen is obtained. The strength test is carried out on the concrete specimen at the corresponding age. The results are as follows: Table 3 shows.
[0044] Table 3 Effect of different alkali content on the performance of UE concrete
[0045] Alkali dosage 6 hours strength (MPa) 0.7 54.8 0.75 59.1 0.8 34.6
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